diff --git a/.dockerignore b/.dockerignore
index 563ba71..ae7c191 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,2 +1,4 @@
-/node_modules
-/build
\ No newline at end of file
+/client/node_modules
+/build
+/data
+/server/vendor
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 0d08982..c3f90ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,7 @@
-node_modules
-/dist
-/*.log
-/.vscode
\ No newline at end of file
+/client/node_modules
+/client/dist
+*.log
+/.vscode
+/server/bin
+/server/data
+/server/vendor
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 4186dc0..7496990 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,18 +5,19 @@ RUN apk add --no-cache nodejs npm git make
 COPY . /src
 WORKDIR /src
 
-RUN npm install && make build
+RUN make install-deps \
+    && make build
 
 FROM alpine:3.11
 
-COPY --from=build /src/dist /app
+COPY --from=build /src/client/dist /client
 
-WORKDIR /app
+WORKDIR /client
 
 RUN apk add --no-cache caddy
 
-COPY misc/dokku/Caddyfile /app/Caddyfile
-COPY misc/dokku/CHECKS /app/CHECKS
+COPY misc/dokku/Caddyfile /client/Caddyfile
+COPY misc/dokku/CHECKS /client/CHECKS
 
 EXPOSE 80
 
diff --git a/LICENCE b/LICENCE
new file mode 100644
index 0000000..bae94e1
--- /dev/null
+++ b/LICENCE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
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+licenses of parties who have received copies or rights from you under
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+
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
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+the Program, the only way you could satisfy both those terms and this
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+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
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+following paragraph.
+
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+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
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+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
\ No newline at end of file
diff --git a/Makefile b/Makefile
index dd7574a..e1667da 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,18 @@
 DOKKU_URL := dokku@dev.lookingfora.name:guesstimate
 
 watch:
-	npm run dev
+	modd
 
-build: clean
-	npm run build
+install-deps:
+	cd client && npm install
+
+build: clean build-server build-client
+
+build-client:
+	cd client && npm run build
+
+build-server:
+	cd server && CGO_ENABLED=0 go build -mod=vendor -v -o bin/server ./cmd/server
 
 clean:
 	rm -rf dist
diff --git a/package-lock.json b/client/package-lock.json
similarity index 99%
rename from package-lock.json
rename to client/package-lock.json
index 57c3e08..d34790f 100644
--- a/package-lock.json
+++ b/client/package-lock.json
@@ -2392,6 +2392,11 @@
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.1.tgz",
       "integrity": "sha512-8UEa58QDLauDNfpbrX55Q9jrGHThw2ZMdOky5Gl1CDtVeJDPVrG4Jxx1N8jw2gkWaff5UUuX1KJd+9zGe2B+ZA=="
     },
+    "fast-json-patch": {
+      "version": "3.0.0-1",
+      "resolved": "https://registry.npmjs.org/fast-json-patch/-/fast-json-patch-3.0.0-1.tgz",
+      "integrity": "sha512-6pdFb07cknxvPzCeLsFHStEy+MysPJPgZQ9LbQ/2O67unQF93SNqfdSqnPPl71YMHX+AD8gbl7iuoGFzHEdDuw=="
+    },
     "fast-json-stable-stringify": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
diff --git a/package.json b/client/package.json
similarity index 97%
rename from package.json
rename to client/package.json
index c5c1c3d..bc9766d 100644
--- a/package.json
+++ b/client/package.json
@@ -8,6 +8,7 @@
     "bs58": "^4.0.1",
     "bulma": "^0.8.2",
     "bulma-switch": "^2.0.0",
+    "fast-json-patch": "^3.0.0-1",
     "preact": "^10.4.1",
     "preact-markup": "^1.6.0",
     "preact-render-to-string": "^5.1.6",
diff --git a/src/assets/favicon.ico b/client/src/assets/favicon.ico
similarity index 100%
rename from src/assets/favicon.ico
rename to client/src/assets/favicon.ico
diff --git a/src/assets/icons/android-chrome-192x192.png b/client/src/assets/icons/android-chrome-192x192.png
similarity index 100%
rename from src/assets/icons/android-chrome-192x192.png
rename to client/src/assets/icons/android-chrome-192x192.png
diff --git a/src/assets/icons/android-chrome-512x512.png b/client/src/assets/icons/android-chrome-512x512.png
similarity index 100%
rename from src/assets/icons/android-chrome-512x512.png
rename to client/src/assets/icons/android-chrome-512x512.png
diff --git a/src/assets/icons/apple-touch-icon.png b/client/src/assets/icons/apple-touch-icon.png
similarity index 100%
rename from src/assets/icons/apple-touch-icon.png
rename to client/src/assets/icons/apple-touch-icon.png
diff --git a/src/assets/icons/favicon-16x16.png b/client/src/assets/icons/favicon-16x16.png
similarity index 100%
rename from src/assets/icons/favicon-16x16.png
rename to client/src/assets/icons/favicon-16x16.png
diff --git a/src/assets/icons/favicon-32x32.png b/client/src/assets/icons/favicon-32x32.png
similarity index 100%
rename from src/assets/icons/favicon-32x32.png
rename to client/src/assets/icons/favicon-32x32.png
diff --git a/src/assets/icons/mstile-150x150.png b/client/src/assets/icons/mstile-150x150.png
similarity index 100%
rename from src/assets/icons/mstile-150x150.png
rename to client/src/assets/icons/mstile-150x150.png
diff --git a/src/components/app.tsx b/client/src/components/app.tsx
similarity index 100%
rename from src/components/app.tsx
rename to client/src/components/app.tsx
diff --git a/src/components/editable-text/index.tsx b/client/src/components/editable-text/index.tsx
similarity index 100%
rename from src/components/editable-text/index.tsx
rename to client/src/components/editable-text/index.tsx
diff --git a/src/components/editable-text/style.module.css b/client/src/components/editable-text/style.module.css
similarity index 100%
rename from src/components/editable-text/style.module.css
rename to client/src/components/editable-text/style.module.css
diff --git a/src/components/editable-text/style.module.css.d.ts b/client/src/components/editable-text/style.module.css.d.ts
similarity index 100%
rename from src/components/editable-text/style.module.css.d.ts
rename to client/src/components/editable-text/style.module.css.d.ts
diff --git a/src/components/estimation-range.tsx b/client/src/components/estimation-range.tsx
similarity index 100%
rename from src/components/estimation-range.tsx
rename to client/src/components/estimation-range.tsx
diff --git a/src/components/header/index.tsx b/client/src/components/header/index.tsx
similarity index 100%
rename from src/components/header/index.tsx
rename to client/src/components/header/index.tsx
diff --git a/src/components/header/style.module.css b/client/src/components/header/style.module.css
similarity index 100%
rename from src/components/header/style.module.css
rename to client/src/components/header/style.module.css
diff --git a/src/components/header/style.module.css.d.ts b/client/src/components/header/style.module.css.d.ts
similarity index 100%
rename from src/components/header/style.module.css.d.ts
rename to client/src/components/header/style.module.css.d.ts
diff --git a/src/components/project-time-unit.tsx b/client/src/components/project-time-unit.tsx
similarity index 100%
rename from src/components/project-time-unit.tsx
rename to client/src/components/project-time-unit.tsx
diff --git a/src/components/tabs/index.tsx b/client/src/components/tabs/index.tsx
similarity index 100%
rename from src/components/tabs/index.tsx
rename to client/src/components/tabs/index.tsx
diff --git a/src/components/tabs/style.module.css b/client/src/components/tabs/style.module.css
similarity index 100%
rename from src/components/tabs/style.module.css
rename to client/src/components/tabs/style.module.css
diff --git a/src/components/tabs/style.module.css.d.ts b/client/src/components/tabs/style.module.css.d.ts
similarity index 100%
rename from src/components/tabs/style.module.css.d.ts
rename to client/src/components/tabs/style.module.css.d.ts
diff --git a/src/hooks/use-local-storage.ts b/client/src/hooks/use-local-storage.ts
similarity index 100%
rename from src/hooks/use-local-storage.ts
rename to client/src/hooks/use-local-storage.ts
diff --git a/src/hooks/use-media-query.ts b/client/src/hooks/use-media-query.ts
similarity index 100%
rename from src/hooks/use-media-query.ts
rename to client/src/hooks/use-media-query.ts
diff --git a/client/src/hooks/use-previous.ts b/client/src/hooks/use-previous.ts
new file mode 100644
index 0000000..0b81fb9
--- /dev/null
+++ b/client/src/hooks/use-previous.ts
@@ -0,0 +1,11 @@
+import { useEffect, useRef } from "preact/hooks";
+
+export function usePrevious<T>(value: T): T|undefined {
+  const ref = useRef();
+
+  useEffect(() => {
+    ref.current = value;
+  }, [value]);
+  
+  return ref.current as T|undefined;
+}
\ No newline at end of file
diff --git a/src/hooks/use-project-estimations.ts b/client/src/hooks/use-project-estimations.ts
similarity index 100%
rename from src/hooks/use-project-estimations.ts
rename to client/src/hooks/use-project-estimations.ts
diff --git a/src/hooks/use-project-reducer.ts b/client/src/hooks/use-project-reducer.ts
similarity index 100%
rename from src/hooks/use-project-reducer.ts
rename to client/src/hooks/use-project-reducer.ts
diff --git a/client/src/hooks/use-server-sync.ts b/client/src/hooks/use-server-sync.ts
new file mode 100644
index 0000000..9821d12
--- /dev/null
+++ b/client/src/hooks/use-server-sync.ts
@@ -0,0 +1,57 @@
+import { Project } from "../models/project";
+import { usePrevious } from "./use-previous";
+import * as jsonpatch from 'fast-json-patch';
+import { useEffect, useState } from "preact/hooks";
+import { Operation } from "fast-json-patch";
+
+export interface ServerSyncOptions {
+  baseUrl: string
+}
+
+export const defaultOptions = {
+  baseUrl: `ws://${window.location.host}/ws`,
+}
+
+export function useServerSync(project: Project, options: ServerSyncOptions = defaultOptions) {
+  options = Object.assign({}, defaultOptions, options);
+  
+  const [ conn, setConn ] = useState<WebSocket>(() => {
+    const conn = new WebSocket(`${options.baseUrl}/${project.id}`);
+    
+    conn.onerror = (evt: Event) => {
+      console.error(evt);
+    };
+
+    conn.onopen = (evt: Event) => {
+      console.log('ws connection opened');
+    };
+
+    return conn;
+  });
+
+  const [ ops, setOps ] = useState<Operation[][]>([]);
+
+  useEffect(() => {    
+    return () => {
+      if (!conn) return;
+      console.log('closing ws');
+      conn.close();
+      conn.onerror = null;
+      conn.onopen = null;
+    };
+  }, []);
+
+  useEffect(() => {
+    conn.send(JSON.stringify(ops));
+    setOps([]);
+  }, [ops.length > 0]);
+
+  let previousProject: Project|any = usePrevious(project);
+  if (!previousProject) previousProject = {};
+
+  const newOps = jsonpatch.compare(previousProject, project);
+
+  if (ops.length === 0) return;
+
+  setOps(ops => [...ops, newOps]);
+}
\ No newline at end of file
diff --git a/src/hooks/use-stored-project-list.ts b/client/src/hooks/use-stored-project-list.ts
similarity index 100%
rename from src/hooks/use-stored-project-list.ts
rename to client/src/hooks/use-stored-project-list.ts
diff --git a/src/index.html b/client/src/index.html
similarity index 100%
rename from src/index.html
rename to client/src/index.html
diff --git a/src/index.js b/client/src/index.js
similarity index 100%
rename from src/index.js
rename to client/src/index.js
diff --git a/src/models/params.ts b/client/src/models/params.ts
similarity index 100%
rename from src/models/params.ts
rename to client/src/models/params.ts
diff --git a/src/models/project.ts b/client/src/models/project.ts
similarity index 100%
rename from src/models/project.ts
rename to client/src/models/project.ts
diff --git a/src/models/task.ts b/client/src/models/task.ts
similarity index 100%
rename from src/models/task.ts
rename to client/src/models/task.ts
diff --git a/src/routes/home/index.tsx b/client/src/routes/home/index.tsx
similarity index 100%
rename from src/routes/home/index.tsx
rename to client/src/routes/home/index.tsx
diff --git a/src/routes/home/style.module.css b/client/src/routes/home/style.module.css
similarity index 100%
rename from src/routes/home/style.module.css
rename to client/src/routes/home/style.module.css
diff --git a/src/routes/home/style.module.css.d.ts b/client/src/routes/home/style.module.css.d.ts
similarity index 100%
rename from src/routes/home/style.module.css.d.ts
rename to client/src/routes/home/style.module.css.d.ts
diff --git a/src/routes/notfound/index.tsx b/client/src/routes/notfound/index.tsx
similarity index 100%
rename from src/routes/notfound/index.tsx
rename to client/src/routes/notfound/index.tsx
diff --git a/src/routes/notfound/style.module.css b/client/src/routes/notfound/style.module.css
similarity index 100%
rename from src/routes/notfound/style.module.css
rename to client/src/routes/notfound/style.module.css
diff --git a/src/routes/notfound/style.module.css.d.ts b/client/src/routes/notfound/style.module.css.d.ts
similarity index 100%
rename from src/routes/notfound/style.module.css.d.ts
rename to client/src/routes/notfound/style.module.css.d.ts
diff --git a/src/routes/project/estimation-tab.tsx b/client/src/routes/project/estimation-tab.tsx
similarity index 100%
rename from src/routes/project/estimation-tab.tsx
rename to client/src/routes/project/estimation-tab.tsx
diff --git a/src/routes/project/export-tab.tsx b/client/src/routes/project/export-tab.tsx
similarity index 100%
rename from src/routes/project/export-tab.tsx
rename to client/src/routes/project/export-tab.tsx
diff --git a/src/routes/project/financial-preview.tsx b/client/src/routes/project/financial-preview.tsx
similarity index 100%
rename from src/routes/project/financial-preview.tsx
rename to client/src/routes/project/financial-preview.tsx
diff --git a/src/routes/project/index.tsx b/client/src/routes/project/index.tsx
similarity index 96%
rename from src/routes/project/index.tsx
rename to client/src/routes/project/index.tsx
index da7045f..690538e 100644
--- a/src/routes/project/index.tsx
+++ b/client/src/routes/project/index.tsx
@@ -10,6 +10,7 @@ import Tabs from "../../components/tabs";
 import EstimationTab from "./estimation-tab";
 import ParamsTab from "./params-tab";
 import ExportTab from "./export-tab";
+import { useServerSync } from "../../hooks/use-server-sync";
 
 export interface ProjectProps {
     projectId: string
@@ -19,6 +20,7 @@ const Project: FunctionalComponent<ProjectProps> = ({ projectId }) => {
     const projectStorageKey = getProjectStorageKey(projectId);
     const [ storedProject, storeProject ] = useLocalStorage(projectStorageKey, newProject(projectId));
     const [ project, dispatch ] = useProjectReducer(storedProject);
+    useServerSync(project)
 
     const onProjectLabelChange = (projectLabel: string) => {
         dispatch(updateProjectLabel(projectLabel));
diff --git a/src/routes/project/params-tab.tsx b/client/src/routes/project/params-tab.tsx
similarity index 100%
rename from src/routes/project/params-tab.tsx
rename to client/src/routes/project/params-tab.tsx
diff --git a/src/routes/project/repartition-preview.tsx b/client/src/routes/project/repartition-preview.tsx
similarity index 100%
rename from src/routes/project/repartition-preview.tsx
rename to client/src/routes/project/repartition-preview.tsx
diff --git a/src/routes/project/style.module.css b/client/src/routes/project/style.module.css
similarity index 100%
rename from src/routes/project/style.module.css
rename to client/src/routes/project/style.module.css
diff --git a/src/routes/project/style.module.css.d.ts b/client/src/routes/project/style.module.css.d.ts
similarity index 100%
rename from src/routes/project/style.module.css.d.ts
rename to client/src/routes/project/style.module.css.d.ts
diff --git a/src/routes/project/task-categories-table.tsx b/client/src/routes/project/task-categories-table.tsx
similarity index 100%
rename from src/routes/project/task-categories-table.tsx
rename to client/src/routes/project/task-categories-table.tsx
diff --git a/src/routes/project/tasks-table.tsx b/client/src/routes/project/tasks-table.tsx
similarity index 100%
rename from src/routes/project/tasks-table.tsx
rename to client/src/routes/project/tasks-table.tsx
diff --git a/src/routes/project/time-preview.tsx b/client/src/routes/project/time-preview.tsx
similarity index 100%
rename from src/routes/project/time-preview.tsx
rename to client/src/routes/project/time-preview.tsx
diff --git a/src/style/index.css b/client/src/style/index.css
similarity index 100%
rename from src/style/index.css
rename to client/src/style/index.css
diff --git a/src/style/index.css.d.ts b/client/src/style/index.css.d.ts
similarity index 100%
rename from src/style/index.css.d.ts
rename to client/src/style/index.css.d.ts
diff --git a/src/util/stat.ts b/client/src/util/stat.ts
similarity index 100%
rename from src/util/stat.ts
rename to client/src/util/stat.ts
diff --git a/src/util/storage.ts b/client/src/util/storage.ts
similarity index 100%
rename from src/util/storage.ts
rename to client/src/util/storage.ts
diff --git a/src/util/uuid.ts b/client/src/util/uuid.ts
similarity index 100%
rename from src/util/uuid.ts
rename to client/src/util/uuid.ts
diff --git a/tsconfig.json b/client/tsconfig.json
similarity index 100%
rename from tsconfig.json
rename to client/tsconfig.json
diff --git a/webpack.config.js b/client/webpack.config.js
similarity index 94%
rename from webpack.config.js
rename to client/webpack.config.js
index 3596984..763dbd3 100644
--- a/webpack.config.js
+++ b/client/webpack.config.js
@@ -23,6 +23,12 @@ module.exports = {
     port: 8080,
     historyApiFallback: true,
     hot: env.NODE_ENV === 'development',
+    proxy: {
+      '/ws': {
+        target: 'http://127.0.0.1:8081',
+        ws: true
+      }
+    }
   },
   module: {
     rules: [
diff --git a/modd.conf b/modd.conf
new file mode 100644
index 0000000..1baca69
--- /dev/null
+++ b/modd.conf
@@ -0,0 +1,19 @@
+server/**/*.go
+!server/**/*_test.go
+server/data/config.yml
+.env
+modd.conf {
+  prep: make build-server
+  prep: cd server && [ -e data/config.yml ] || ( mkdir -p data && bin/server -dump-config > data/config.yml )
+  prep: cd server && [ -e .env ] || ( cp .env.dist .env ) 
+  daemon: cd server &&  ( set -o allexport && source .env && set +o allexport && bin/server -config data/config.yml )
+}
+
+{
+  daemon: cd client && npm run dev
+}
+
+server/**/*.go
+server/**/*_test.go {
+  prep: cd server && go clean -testcache && go test -v ./...
+}
\ No newline at end of file
diff --git a/server/.env b/server/.env
new file mode 100644
index 0000000..892ca3e
--- /dev/null
+++ b/server/.env
@@ -0,0 +1 @@
+GUESSTIMATE_DATA_PATH=data/guesstimate.db
\ No newline at end of file
diff --git a/server/.env.dist b/server/.env.dist
new file mode 100644
index 0000000..892ca3e
--- /dev/null
+++ b/server/.env.dist
@@ -0,0 +1 @@
+GUESSTIMATE_DATA_PATH=data/guesstimate.db
\ No newline at end of file
diff --git a/server/cmd/server/container.go b/server/cmd/server/container.go
new file mode 100644
index 0000000..7c5b6d9
--- /dev/null
+++ b/server/cmd/server/container.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"forge.cadoles.com/wpetit/guesstimate/internal/config"
+	"forge.cadoles.com/wpetit/guesstimate/internal/storm"
+	"gitlab.com/wpetit/goweb/service"
+	"gitlab.com/wpetit/goweb/service/build"
+)
+
+func getServiceContainer(conf *config.Config) (*service.Container, error) {
+	// Initialize and configure service container
+	ctn := service.NewContainer()
+
+	ctn.Provide(build.ServiceName, build.ServiceProvider(ProjectVersion, GitRef, BuildDate))
+
+	// Create and expose config service provider
+	ctn.Provide(config.ServiceName, config.ServiceProvider(conf))
+
+	ctn.Provide(storm.ServiceName, storm.ServiceProvider(
+		storm.WithPath(conf.Data.Path),
+	))
+
+	return ctn, nil
+}
diff --git a/server/cmd/server/main.go b/server/cmd/server/main.go
new file mode 100644
index 0000000..a6c5c0d
--- /dev/null
+++ b/server/cmd/server/main.go
@@ -0,0 +1,117 @@
+package main
+
+import (
+	"net/http"
+
+	"forge.cadoles.com/wpetit/guesstimate/internal/route"
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+	"gitlab.com/wpetit/goweb/middleware/container"
+
+	"flag"
+	"fmt"
+	"log"
+
+	"os"
+
+	"forge.cadoles.com/wpetit/guesstimate/internal/config"
+	"github.com/pkg/errors"
+)
+
+//nolint: gochecknoglobals
+var (
+	configFile = ""
+	workdir    = ""
+	dumpConfig = false
+	version    = false
+)
+
+// nolint: gochecknoglobals
+var (
+	GitRef         = "unknown"
+	ProjectVersion = "unknown"
+	BuildDate      = "unknown"
+)
+
+//nolint: gochecknoinits
+func init() {
+	flag.StringVar(&configFile, "config", configFile, "configuration file")
+	flag.StringVar(&workdir, "workdir", workdir, "working directory")
+	flag.BoolVar(&dumpConfig, "dump-config", dumpConfig, "dump configuration and exit")
+	flag.BoolVar(&version, "version", version, "show version and exit")
+}
+
+func main() {
+	flag.Parse()
+
+	if version {
+		fmt.Printf("%s (%s) - %s\n", ProjectVersion, GitRef, BuildDate)
+
+		os.Exit(0)
+	}
+
+	// Switch to new working directory if defined
+	if workdir != "" {
+		if err := os.Chdir(workdir); err != nil {
+			log.Fatalf("%+v", errors.Wrapf(err, "could not change working directory to '%s'", workdir))
+		}
+	}
+
+	// Load configuration file if defined, use default configuration otherwise
+	var conf *config.Config
+
+	var err error
+
+	if configFile != "" {
+		conf, err = config.NewFromFile(configFile)
+		if err != nil {
+			log.Fatalf("%+v", errors.Wrapf(err, "could not load config file '%s'", configFile))
+		}
+	} else {
+		if dumpConfig {
+			conf = config.NewDumpDefault()
+		} else {
+			conf = config.NewDefault()
+		}
+
+	}
+
+	// Dump configuration if asked
+	if dumpConfig {
+		if err := config.Dump(conf, os.Stdout); err != nil {
+			log.Fatalf("%+v", errors.Wrap(err, "could not dump config"))
+		}
+
+		os.Exit(0)
+	}
+
+	if err := config.WithEnvironment(conf); err != nil {
+		log.Fatalf("%+v", errors.Wrap(err, "could not override config with environment"))
+	}
+
+	// Create service container
+	ctn, err := getServiceContainer(conf)
+	if err != nil {
+		log.Fatalf("%+v", errors.Wrap(err, "could not create service container"))
+	}
+
+	r := chi.NewRouter()
+
+	// Define base middlewares
+	r.Use(middleware.Logger)
+	r.Use(middleware.Recoverer)
+
+	// Expose service container on router
+	r.Use(container.ServiceContainer(ctn))
+
+	// Define routes
+	if err := route.Mount(r, conf); err != nil {
+		log.Fatalf("%+v", errors.Wrap(err, "could not mount http routes"))
+	}
+
+	log.Printf("listening on '%s'", conf.HTTP.Address)
+
+	if err := http.ListenAndServe(conf.HTTP.Address, r); err != nil {
+		log.Fatalf("%+v", errors.Wrapf(err, "could not listen on '%s'", conf.HTTP.Address))
+	}
+}
diff --git a/server/go.mod b/server/go.mod
new file mode 100644
index 0000000..d6a2e15
--- /dev/null
+++ b/server/go.mod
@@ -0,0 +1,18 @@
+module forge.cadoles.com/wpetit/guesstimate
+
+go 1.14
+
+require (
+	github.com/asdine/storm/v3 v3.1.1
+	github.com/caarlos0/env/v6 v6.2.1
+	github.com/davecgh/go-spew v1.1.1
+	github.com/go-chi/chi v4.1.1+incompatible
+	github.com/gorilla/websocket v1.4.2
+	github.com/pkg/errors v0.9.1
+	gitlab.com/wpetit/goweb v0.0.0-20200418152305-76dea96a46ce
+	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e // indirect
+	gopkg.in/evanphx/json-patch.v4 v4.5.0
+	gopkg.in/yaml.v2 v2.2.8
+)
+
+// replace gitlab.com/wpetit/goweb => ../goweb
diff --git a/server/go.sum b/server/go.sum
new file mode 100644
index 0000000..4a15dba
--- /dev/null
+++ b/server/go.sum
@@ -0,0 +1,268 @@
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diff --git a/server/internal/config/config.go b/server/internal/config/config.go
new file mode 100644
index 0000000..3d94d77
--- /dev/null
+++ b/server/internal/config/config.go
@@ -0,0 +1,77 @@
+package config
+
+import (
+	"io"
+	"io/ioutil"
+
+	"github.com/caarlos0/env/v6"
+	"github.com/pkg/errors"
+
+	"gopkg.in/yaml.v2"
+)
+
+type Config struct {
+	HTTP HTTPConfig `yaml:"http"`
+	Data DataConfig `ymal:"data"`
+}
+
+type HTTPConfig struct {
+	Address string `yaml:"address" env:"GUESSTIMATE_HTTP_ADDRESS"`
+}
+
+type DataConfig struct {
+	Path string `yaml:"path" env:"GUESSTIMATE_DATA_PATH"`
+}
+
+// NewFromFile retrieves the configuration from the given file
+func NewFromFile(filepath string) (*Config, error) {
+	config := NewDefault()
+
+	data, err := ioutil.ReadFile(filepath)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not read file '%s'", filepath)
+	}
+
+	if err := yaml.Unmarshal(data, config); err != nil {
+		return nil, errors.Wrapf(err, "could not unmarshal configuration")
+	}
+
+	return config, nil
+}
+
+func WithEnvironment(conf *Config) error {
+	if err := env.Parse(conf); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func NewDumpDefault() *Config {
+	config := NewDefault()
+	return config
+}
+
+func NewDefault() *Config {
+	return &Config{
+		HTTP: HTTPConfig{
+			Address: ":8081",
+		},
+		Data: DataConfig{
+			Path: "guesstimate.db",
+		},
+	}
+}
+
+func Dump(config *Config, w io.Writer) error {
+	data, err := yaml.Marshal(config)
+	if err != nil {
+		return errors.Wrap(err, "could not dump config")
+	}
+
+	if _, err := w.Write(data); err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/server/internal/config/provider.go b/server/internal/config/provider.go
new file mode 100644
index 0000000..0e768ed
--- /dev/null
+++ b/server/internal/config/provider.go
@@ -0,0 +1,9 @@
+package config
+
+import "gitlab.com/wpetit/goweb/service"
+
+func ServiceProvider(config *Config) service.Provider {
+	return func(ctn *service.Container) (interface{}, error) {
+		return config, nil
+	}
+}
diff --git a/server/internal/config/service.go b/server/internal/config/service.go
new file mode 100644
index 0000000..e57c05d
--- /dev/null
+++ b/server/internal/config/service.go
@@ -0,0 +1,33 @@
+package config
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+const ServiceName service.Name = "config"
+
+// From retrieves the config service in the given container
+func From(container *service.Container) (*Config, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+
+	srv, ok := service.(*Config)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+
+	return srv, nil
+}
+
+// Must retrieves the config service in the given container or panic otherwise
+func Must(container *service.Container) *Config {
+	srv, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+
+	return srv
+}
diff --git a/server/internal/diffsync/backup.go b/server/internal/diffsync/backup.go
new file mode 100644
index 0000000..bf9b376
--- /dev/null
+++ b/server/internal/diffsync/backup.go
@@ -0,0 +1,21 @@
+package diffsync
+
+type Backup struct {
+	localVersion Version
+	content      []byte
+}
+
+func (b *Backup) LocalVersion() Version {
+	return b.localVersion
+}
+
+func (b *Backup) Content() []byte {
+	return b.content
+}
+
+func NewBackup(content []byte) *Backup {
+	return &Backup{
+		localVersion: 0,
+		content:      content,
+	}
+}
diff --git a/server/internal/diffsync/diff_patch.go b/server/internal/diffsync/diff_patch.go
new file mode 100644
index 0000000..cea67f7
--- /dev/null
+++ b/server/internal/diffsync/diff_patch.go
@@ -0,0 +1,31 @@
+package diffsync
+
+type EditsStack []*Edits
+
+type Ops interface{}
+
+type Edits struct {
+	ops           Ops
+	localVersion  Version
+	remoteVersion Version
+}
+
+func (e *Edits) Ops() Ops {
+	return e.ops
+}
+
+func (e *Edits) LocalVersion() Version {
+	return e.localVersion
+}
+
+func (e *Edits) RemoteVersion() Version {
+	return e.remoteVersion
+}
+
+type Differ interface {
+	Diff(new, old []byte) (Ops, error)
+}
+
+type Patcher interface {
+	Patch(content []byte, ops Ops) ([]byte, error)
+}
diff --git a/server/internal/diffsync/document.go b/server/internal/diffsync/document.go
new file mode 100644
index 0000000..c3e62f7
--- /dev/null
+++ b/server/internal/diffsync/document.go
@@ -0,0 +1,56 @@
+package diffsync
+
+import "sync"
+
+type Version uint64
+
+type void struct{}
+
+type Document struct {
+	content    []byte
+	patcher    Patcher
+	differ     Differ
+	peers      map[*Peer]void
+	peersMutex sync.RWMutex
+}
+
+func (d *Document) NewPeer() *Peer {
+	d.peersMutex.Lock()
+	defer d.peersMutex.Unlock()
+
+	p := &Peer{
+		document:   d,
+		shadow:     NewShadow(Copy(d.content)),
+		editsStack: make(EditsStack, 0),
+	}
+
+	d.peers[p] = void{}
+
+	return p
+}
+
+func (d *Document) RemovePeer(p *Peer) {
+	d.peersMutex.Lock()
+	defer d.peersMutex.Unlock()
+
+	delete(d.peers, p)
+	p.document = nil
+}
+
+func (d *Document) Content() []byte {
+	return d.content
+}
+
+func NewDocument(content []byte, funcs ...OptionFunc) *Document {
+	opt := MergeOption(
+		DefaultOption(),
+		funcs...,
+	)
+
+	return &Document{
+		content: content,
+		patcher: opt.Patcher,
+		differ:  opt.Differ,
+		peers:   make(map[*Peer]void),
+	}
+}
diff --git a/server/internal/diffsync/error.go b/server/internal/diffsync/error.go
new file mode 100644
index 0000000..9cc3e84
--- /dev/null
+++ b/server/internal/diffsync/error.go
@@ -0,0 +1,9 @@
+package diffsync
+
+import "errors"
+
+var (
+	ErrUnexpectedOpsFormat     = errors.New("unexpected ops format")
+	ErrUnexpectedRemoteVersion = errors.New("unexpected remote version")
+	ErrInvalidState            = errors.New("invalid state")
+)
diff --git a/server/internal/diffsync/json/diff_patch.go b/server/internal/diffsync/json/diff_patch.go
new file mode 100644
index 0000000..c4e19d6
--- /dev/null
+++ b/server/internal/diffsync/json/diff_patch.go
@@ -0,0 +1,42 @@
+package json
+
+import (
+	"forge.cadoles.com/wpetit/guesstimate/internal/diffsync"
+	"github.com/pkg/errors"
+	jsonpatch "gopkg.in/evanphx/json-patch.v4"
+)
+
+type Patcher struct{}
+
+func (p *Patcher) Patch(content []byte, ops diffsync.Ops) ([]byte, error) {
+	patch, ok := ops.([]byte)
+	if !ok {
+		return nil, diffsync.ErrUnexpectedOpsFormat
+	}
+
+	modified, err := jsonpatch.MergePatch(content, patch)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not apply patch")
+	}
+
+	return modified, nil
+}
+
+func NewPatcher() *Patcher {
+	return &Patcher{}
+}
+
+type Differ struct{}
+
+func (d *Differ) Diff(new, old []byte) (diffsync.Ops, error) {
+	ops, err := jsonpatch.CreateMergePatch(old, new)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not compute diff")
+	}
+
+	return ops, nil
+}
+
+func NewDiffer() *Differ {
+	return &Differ{}
+}
diff --git a/server/internal/diffsync/json/json_test.go b/server/internal/diffsync/json/json_test.go
new file mode 100644
index 0000000..635ae92
--- /dev/null
+++ b/server/internal/diffsync/json/json_test.go
@@ -0,0 +1,169 @@
+package json
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"reflect"
+	"testing"
+
+	"forge.cadoles.com/wpetit/guesstimate/internal/diffsync"
+	"github.com/davecgh/go-spew/spew"
+)
+
+func TestJSONSync(t *testing.T) {
+	doc1 := diffsync.NewDocument(
+		[]byte("{}"),
+		WithJSONSync(),
+	)
+
+	doc2 := diffsync.NewDocument(
+		[]byte("{}"),
+		WithJSONSync(),
+	)
+
+	p1 := doc1.NewPeer()
+	p2 := doc2.NewPeer()
+
+	log.Printf("p1 shadow: %s", p1.Shadow().Content())
+	log.Printf("p2 shadow: %s", p2.Shadow().Content())
+
+	newContent1 := []byte(`{"hello":"world"}`)
+
+	log.Printf("updating doc1 with '%s'", newContent1)
+
+	stack1, err := p1.Update(newContent1)
+	if err != nil {
+		t.Error(err)
+	}
+
+	log.Printf("applying stack1 to doc2 '%s'", doc2.Content())
+
+	if err := p2.Apply(stack1); err != nil {
+		t.Error(err)
+	}
+
+	log.Printf("new doc2 content: '%s'", doc2.Content())
+
+	if g, e := doc2.Content(), doc1.Content(); !jsonEqual(e, g) {
+		t.Errorf("doc2.Content(): expected '%s', got '%s'", e, g)
+	}
+}
+
+type testStep struct {
+	Local       *diffsync.Peer
+	Remote      *diffsync.Peer
+	Update      string
+	MatchLocal  bool
+	MatchRemote bool
+}
+
+func TestBidirectionnalUpdate(t *testing.T) {
+	doc1 := diffsync.NewDocument([]byte(`{}`), WithJSONSync())
+	doc2 := diffsync.NewDocument([]byte(`{}`), WithJSONSync())
+
+	p1 := doc1.NewPeer()
+	p2 := doc2.NewPeer()
+
+	var cases = []testStep{
+		{
+			Local:       p1,
+			Remote:      p2,
+			Update:      `{"hello":"world"}`,
+			MatchLocal:  true,
+			MatchRemote: true,
+		},
+		{
+			Local:       p2,
+			Remote:      p1,
+			Update:      `{"hello":"world","foo":"bar"}`,
+			MatchLocal:  true,
+			MatchRemote: true,
+		},
+		{
+			Local:       p1,
+			Remote:      p2,
+			Update:      `{"hello":1,"foo":"bar"}`,
+			MatchLocal:  true,
+			MatchRemote: true,
+		},
+		{
+			Local:       p1,
+			Remote:      nil,
+			Update:      `{"hello":1,"foo":"bar", "test":{"bar": "baz"}}`,
+			MatchLocal:  true,
+			MatchRemote: false,
+		},
+		{
+			Local:       p2,
+			Remote:      p1,
+			Update:      `{"hello":2,"foo":"bar", "test":{"bar": "baz","world":"hello"}}`,
+			MatchLocal:  true,
+			MatchRemote: true,
+		},
+	}
+
+	for i, step := range cases {
+		func(step testStep, i int) {
+			t.Run(fmt.Sprintf("Step %d", i), func(t *testing.T) {
+				log.Printf("local document before update: '%s'", step.Local.Document().Content())
+
+				stack, err := step.Local.Update([]byte(step.Update))
+				if err != nil {
+					t.Error(err)
+				}
+
+				log.Printf("local document after update: '%s'", step.Local.Document().Content())
+
+				log.Printf("resulting stack: '%s'", spew.Sdump(stack))
+
+				if step.MatchLocal {
+					if e, g := step.Local.Document().Content(), []byte(step.Update); !jsonEqual(e, g) {
+						t.Errorf("local.Document().Content(): expected '%s', got '%s'", e, g)
+					}
+				}
+
+				if step.Remote != nil {
+					log.Printf("remote document before apply: '%s'", step.Remote.Document().Content())
+					if err := step.Remote.Apply(stack); err != nil {
+						t.Error(err)
+					}
+					log.Printf("remote document after apply: '%s'", step.Remote.Document().Content())
+				}
+
+				if step.MatchRemote {
+					if e, g := step.Remote.Document().Content(), []byte(step.Update); !jsonEqual(e, g) {
+						t.Errorf("remote.Document().Content(): expected '%s', got '%s'", e, g)
+					}
+				}
+
+				if step.MatchLocal && step.MatchRemote {
+					if e, g := step.Local.Document().Content(), step.Remote.Document().Content(); !jsonEqual(e, g) {
+						t.Errorf("local.Document().Content() should match remote.Document().Content() ! Got '%s' and '%s'", e, g)
+					}
+				}
+			})
+		}(step, i)
+	}
+}
+
+func jsonEqual(s1, s2 []byte) bool {
+	var (
+		o1 interface{}
+		o2 interface{}
+	)
+
+	var err error
+
+	err = json.Unmarshal(s1, &o1)
+	if err != nil {
+		panic(fmt.Errorf("Error mashalling []byte 1 :: %s", err.Error()))
+	}
+
+	err = json.Unmarshal(s2, &o2)
+	if err != nil {
+		panic(fmt.Errorf("Error mashalling []byte 2 :: %s", err.Error()))
+	}
+
+	return reflect.DeepEqual(o1, o2)
+}
diff --git a/server/internal/diffsync/json/option.go b/server/internal/diffsync/json/option.go
new file mode 100644
index 0000000..ffbdb32
--- /dev/null
+++ b/server/internal/diffsync/json/option.go
@@ -0,0 +1,10 @@
+package json
+
+import "forge.cadoles.com/wpetit/guesstimate/internal/diffsync"
+
+func WithJSONSync() diffsync.OptionFunc {
+	return func(opt *diffsync.Option) {
+		opt.Differ = NewDiffer()
+		opt.Patcher = NewPatcher()
+	}
+}
diff --git a/server/internal/diffsync/option.go b/server/internal/diffsync/option.go
new file mode 100644
index 0000000..c0b6e30
--- /dev/null
+++ b/server/internal/diffsync/option.go
@@ -0,0 +1,34 @@
+package diffsync
+
+type Option struct {
+	Patcher Patcher
+	Differ  Differ
+}
+
+func WithPatcher(p Patcher) OptionFunc {
+	return func(opt *Option) {
+		opt.Patcher = p
+	}
+}
+
+func WithDiffer(d Differ) OptionFunc {
+	return func(opt *Option) {
+		opt.Differ = d
+	}
+}
+
+type OptionFunc func(*Option)
+
+func DefaultOption() *Option {
+	return MergeOption(
+		&Option{},
+	)
+}
+
+func MergeOption(opt *Option, funcs ...OptionFunc) *Option {
+	for _, fn := range funcs {
+		fn(opt)
+	}
+
+	return opt
+}
diff --git a/server/internal/diffsync/peer.go b/server/internal/diffsync/peer.go
new file mode 100644
index 0000000..0f7231a
--- /dev/null
+++ b/server/internal/diffsync/peer.go
@@ -0,0 +1,151 @@
+package diffsync
+
+import (
+	"log"
+	"sync"
+
+	"github.com/pkg/errors"
+)
+
+type Peer struct {
+	document   *Document
+	shadow     *Shadow
+	mutex      sync.RWMutex
+	editsStack EditsStack
+}
+
+func (p *Peer) Document() *Document {
+	return p.document
+}
+
+func (p *Peer) Shadow() *Shadow {
+	return p.shadow
+}
+
+func (p *Peer) Update(content []byte) (EditsStack, error) {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+
+	ops, err := p.document.differ.Diff(content, p.shadow.content)
+	if err != nil {
+		return nil, err
+	}
+
+	p.editsStack = append(p.editsStack, &Edits{
+		ops:           ops,
+		localVersion:  p.shadow.localVersion,
+		remoteVersion: p.shadow.remoteVersion,
+	})
+
+	p.shadow.localVersion++
+	p.shadow.content = content
+	p.document.content = content
+
+	newStack := make(EditsStack, len(p.editsStack))
+	copy(newStack, p.editsStack)
+
+	return newStack, nil
+}
+
+func (p *Peer) Apply(stack EditsStack) error {
+	p.mutex.Lock()
+	defer p.mutex.Unlock()
+
+	newStack := make(EditsStack, len(p.editsStack))
+	copy(newStack, p.editsStack)
+
+	for _, edits := range stack {
+		rollbacked, err := p.applyEdits(edits)
+		if err != nil {
+			return errors.Wrap(err, "could not apply edits")
+		}
+
+		if rollbacked {
+			newStack = EditsStack{}
+		}
+
+		// Iterate over local edits
+		for i, localEdits := range newStack {
+			if localEdits.LocalVersion() != edits.RemoteVersion() {
+				continue
+			}
+
+			log.Printf("removing edits %d", localEdits.LocalVersion())
+
+			// Remove local edit
+			copy(newStack[i:], newStack[i+1:])
+			newStack[len(newStack)-1] = nil
+			newStack = newStack[:len(newStack)-1]
+		}
+	}
+
+	p.editsStack = newStack
+
+	return nil
+}
+
+func (p *Peer) applyEdits(edits *Edits) (bool, error) {
+	rollbacked := false
+
+	shadow := p.Shadow()
+
+	var (
+		err                    error
+		newDocumentContent     []byte
+		newShadowRemoteVersion Version
+	)
+
+	newShadowContent := shadow.content
+	newShadowLocalVersion := shadow.localVersion
+
+	log.Printf(
+		"shadow(l: %d, r: %d) edits(l: %d, r: %d)",
+		shadow.LocalVersion(), shadow.RemoteVersion(),
+		edits.LocalVersion(), edits.RemoteVersion(),
+	)
+
+	// Desync occurred, rollback to backup if possible
+	if shadow.LocalVersion() > edits.RemoteVersion() {
+		if shadow.Backup().LocalVersion() != edits.RemoteVersion() {
+			return false, ErrUnexpectedRemoteVersion
+		}
+
+		newShadowContent = shadow.backup.Content()
+		newShadowLocalVersion = shadow.backup.LocalVersion()
+		rollbacked = true
+	}
+
+	if edits.LocalVersion() < shadow.RemoteVersion() {
+		return rollbacked, nil
+	}
+
+	if edits.RemoteVersion() < newShadowLocalVersion {
+		return rollbacked, ErrInvalidState
+	}
+
+	newShadowContent, err = p.document.patcher.Patch(newShadowContent, edits.Ops())
+	if err != nil {
+		return false, errors.Wrap(err, "could not patch shadow content")
+	}
+
+	newDocumentContent, err = p.document.patcher.Patch(p.document.content, edits.Ops())
+	if err != nil {
+		return rollbacked, errors.Wrap(err, "could not patch document content")
+	}
+
+	newShadowRemoteVersion++
+
+	// Update shadow
+	shadow.content = newShadowContent
+	shadow.remoteVersion = newShadowRemoteVersion
+	shadow.localVersion = newShadowLocalVersion
+
+	// Update document
+	p.document.content = newDocumentContent
+
+	// Update backup
+	shadow.backup.content = newShadowContent
+	shadow.backup.localVersion = shadow.localVersion
+
+	return rollbacked, nil
+}
diff --git a/server/internal/diffsync/shadow.go b/server/internal/diffsync/shadow.go
new file mode 100644
index 0000000..5cbed00
--- /dev/null
+++ b/server/internal/diffsync/shadow.go
@@ -0,0 +1,40 @@
+package diffsync
+
+type Shadow struct {
+	localVersion  Version
+	remoteVersion Version
+	content       []byte
+	backup        *Backup
+}
+
+func NewShadow(content []byte) *Shadow {
+	return &Shadow{
+		localVersion:  0,
+		remoteVersion: 0,
+		content:       content,
+		backup:        NewBackup(Copy(content)),
+	}
+}
+
+func (s *Shadow) LocalVersion() Version {
+	return s.localVersion
+}
+
+func (s *Shadow) RemoteVersion() Version {
+	return s.remoteVersion
+}
+
+func (s *Shadow) Content() []byte {
+	return s.content
+}
+
+func (s *Shadow) Backup() *Backup {
+	return s.backup
+}
+
+func Copy(content []byte) []byte {
+	contentCopy := make([]byte, len(content))
+	copy(contentCopy, content)
+
+	return contentCopy
+}
diff --git a/server/internal/diffsync/versioned.go b/server/internal/diffsync/versioned.go
new file mode 100644
index 0000000..78c6227
--- /dev/null
+++ b/server/internal/diffsync/versioned.go
@@ -0,0 +1,14 @@
+package diffsync
+
+type Versioned struct {
+	localVersion  Version
+	remoteVersion Version
+}
+
+func (v *Versioned) LocalVersion() Version {
+	return v.localVersion
+}
+
+func (v *Versioned) RemoteVersion() Version {
+	return v.remoteVersion
+}
diff --git a/server/internal/route/mount.go b/server/internal/route/mount.go
new file mode 100644
index 0000000..9906192
--- /dev/null
+++ b/server/internal/route/mount.go
@@ -0,0 +1,12 @@
+package route
+
+import (
+	"forge.cadoles.com/wpetit/guesstimate/internal/config"
+	"github.com/go-chi/chi"
+)
+
+func Mount(r *chi.Mux, config *config.Config) error {
+	r.Get("/ws/{projectId}", handleProjectWebsocket)
+
+	return nil
+}
diff --git a/server/internal/route/project.go b/server/internal/route/project.go
new file mode 100644
index 0000000..ff70a50
--- /dev/null
+++ b/server/internal/route/project.go
@@ -0,0 +1,109 @@
+package route
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/davecgh/go-spew/spew"
+	"github.com/gorilla/websocket"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+var upgrader = websocket.Upgrader{} // nolint: gochecknoglobals
+
+func handleProjectWebsocket(w http.ResponseWriter, r *http.Request) {
+	log.Println("websocket request")
+
+	c, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		panic(errors.Wrap(err, "could not upgrade connection"))
+	}
+	defer c.Close()
+
+	// ctn := container.Must(r.Context())
+
+	// ctx := r.Context()
+
+	// Loop over incoming websocket messages
+	for {
+		_, data, err := c.ReadMessage()
+		if err != nil {
+			cause := errors.Cause(err)
+			if websocket.IsCloseError(cause, 1001, 1005) { // Ignore "going away" and "no status" close errors
+				return
+			}
+
+			logger.Error(
+				r.Context(),
+				"could not read message",
+				logger.E(err),
+			)
+
+			break
+		}
+
+		spew.Dump(data)
+
+		// message := &game.Message{}
+		// if err := json.Unmarshal(data, message); err != nil {
+		// 	logger.Error(
+		// 		r.Context(),
+		// 		"could not decode message",
+		// 		logger.E(err),
+		// 	)
+
+		// 	break
+		// }
+
+		// switch {
+		// case message.Type == game.MessageTypeInit:
+		// 	payload := &game.InitPayload{}
+
+		// 	if err := json.Unmarshal(message.Payload, payload); err != nil {
+		// 		logger.Error(
+		// 			r.Context(),
+		// 			"could not decode payload",
+		// 			logger.E(err),
+		// 		)
+		// 		break
+		// 	}
+
+		// 	setGameID(payload.GameID)
+
+		// 	evt := game.NewEventPlayerConnected(payload.GameID, user.ID)
+		// 	bus.Publish(game.EventNamespace, evt)
+
+		// case message.Type == game.MessageTypeGameEvent:
+		// 	gameID, ok := getGameID()
+		// 	if !ok {
+		// 		logger.Error(
+		// 			r.Context(),
+		// 			"game id not received yet",
+		// 		)
+
+		// 		break
+		// 	}
+
+		// 	payload := &game.EventPayload{}
+		// 	if err := json.Unmarshal(message.Payload, payload); err != nil {
+		// 		logger.Error(
+		// 			r.Context(),
+		// 			"could not decode payload",
+		// 			logger.E(err),
+		// 		)
+		// 		break
+		// 	}
+
+		// 	evt := game.NewEventPlayerMessage(gameID, user.ID, payload.Data)
+		// 	bus.Publish(game.EventNamespace, evt)
+
+		// default:
+		// 	logger.Error(
+		// 		r.Context(),
+		// 		"unsupported message type",
+		// 		logger.F("messageType", message.Type),
+		// 	)
+		// }
+	}
+}
diff --git a/server/internal/storm/error.go b/server/internal/storm/error.go
new file mode 100644
index 0000000..f150230
--- /dev/null
+++ b/server/internal/storm/error.go
@@ -0,0 +1,9 @@
+package storm
+
+import (
+	"github.com/asdine/storm/v3"
+)
+
+var (
+	ErrNotFound = storm.ErrNotFound
+)
diff --git a/server/internal/storm/option.go b/server/internal/storm/option.go
new file mode 100644
index 0000000..4e7ee92
--- /dev/null
+++ b/server/internal/storm/option.go
@@ -0,0 +1,51 @@
+package storm
+
+type Option struct {
+	Path    string
+	Objects []interface{}
+	ReIndex bool
+	Init    bool
+}
+
+type OptionFunc func(*Option)
+
+func DefaultOption() *Option {
+	return MergeOption(
+		&Option{},
+		WithPath("data.db"),
+		WithInit(true),
+		WithReIndex(true),
+	)
+}
+
+func MergeOption(opt *Option, funcs ...OptionFunc) *Option {
+	for _, fn := range funcs {
+		fn(opt)
+	}
+
+	return opt
+}
+
+func WithPath(path string) OptionFunc {
+	return func(opt *Option) {
+		opt.Path = path
+	}
+}
+
+func WithReIndex(reindex bool) OptionFunc {
+	return func(opt *Option) {
+		opt.ReIndex = reindex
+	}
+}
+
+func WithInit(init bool) OptionFunc {
+	return func(opt *Option) {
+		opt.Init = init
+	}
+}
+
+func WithObjects(objects ...interface{}) OptionFunc {
+	return func(opt *Option) {
+		opt.Objects = objects
+	}
+}
diff --git a/server/internal/storm/provider.go b/server/internal/storm/provider.go
new file mode 100644
index 0000000..e00fbcc
--- /dev/null
+++ b/server/internal/storm/provider.go
@@ -0,0 +1,48 @@
+package storm
+
+import (
+	"reflect"
+
+	"github.com/asdine/storm/v3"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+func ServiceProvider(funcs ...OptionFunc) service.Provider {
+	opt := MergeOption(
+		DefaultOption(),
+		funcs...,
+	)
+
+	db, err := storm.Open(opt.Path)
+
+	if err == nil && opt.Objects != nil {
+		err = migrate(db, opt.Objects, opt.Init, opt.ReIndex)
+	}
+
+	return func(ctn *service.Container) (interface{}, error) {
+		if err != nil {
+			return nil, err
+		}
+		return db, nil
+	}
+}
+
+func migrate(db *storm.DB, objects []interface{}, init, reindex bool) error {
+	for _, o := range objects {
+		if init {
+			if err := db.Init(o); err != nil {
+				return errors.Wrapf(err, "could not init object '%s'", reflect.TypeOf(o).String())
+			}
+		}
+
+		if reindex {
+			if err := db.ReIndex(o); err != nil {
+				return errors.Wrapf(err, "could not reindex object '%s'", reflect.TypeOf(o).String())
+			}
+		}
+
+	}
+
+	return nil
+}
diff --git a/server/internal/storm/service.go b/server/internal/storm/service.go
new file mode 100644
index 0000000..15bacfd
--- /dev/null
+++ b/server/internal/storm/service.go
@@ -0,0 +1,34 @@
+package storm
+
+import (
+	"github.com/asdine/storm/v3"
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+const ServiceName service.Name = "storm"
+
+// From retrieves the storm service in the given container
+func From(container *service.Container) (*storm.DB, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+
+	srv, ok := service.(*storm.DB)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+
+	return srv, nil
+}
+
+// Must retrieves the storm service in the given container or panic otherwise
+func Must(container *service.Container) *storm.DB {
+	srv, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+
+	return srv
+}