diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4e472bd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+./backend/node_modules
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0593a2e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "frontend"]
+	path = frontend
+	url = https://git.cybre.town/adb/spot2gether-frontend
diff --git a/backend/.env.example b/backend/.env.example
new file mode 100644
index 0000000..626948b
--- /dev/null
+++ b/backend/.env.example
@@ -0,0 +1,3 @@
+APP_SPOTIFY_CLIENT_ID=
+APP_SPOTIFY_CLIENT_SECRET=
+APP_SPOTIFY_REDIRECT_URI="http://127.0.0.1:8083/auth/callback"
diff --git a/backend/api/auth.mjs b/backend/api/auth.mjs
new file mode 100644
index 0000000..2338566
--- /dev/null
+++ b/backend/api/auth.mjs
@@ -0,0 +1,50 @@
+import { Client, Player } from "spotify-api.js";
+import { store } from "../store.mjs";
+import { randomString } from "../lib/randomString.js";
+import axios from "axios";
+
+export const applyAuthRoutes = (router) => {
+
+  router.post('/', async (req, res) => {
+    if (!req.body.code || !req.body.state) {
+      res.status(400);
+      res.send({ message: 'code or state missing ' });
+      return;
+    }
+    const { code, state } = req.body;
+    try {
+      const params = new URLSearchParams();
+      params.append('grant_type', 'authorization_code');
+      params.append('code', code);
+      params.append('redirect_uri', store.redirectURL);
+
+      const config = {
+        headers: {
+          'Authorization': 'Basic ' + (new Buffer(store.clientID + ':' + store.clientSecret).toString('base64')),
+          'Content-Type': 'application/x-www-form-urlencoded',
+        }
+      };
+
+      const tokens = (await axios.post('https://accounts.spotify.com/api/token', params, config))?.data;
+
+      const client = await Client.create({
+        token: {
+          clientID: store.clientID,
+          clientSecret: store.clientSecret,
+          redirectURL: store.redirectURL,
+          refreshToken: tokens.refresh_token,
+        },
+      });
+      const player = new Player(client);
+      const accessToken = randomString(64);
+      store.users.push({ client, player, accessToken, listeners: [], role: 'none' });
+      res.status(200);
+      res.send({ message: 'authorized', accessToken });
+    } catch (e) {
+      console.log(e.message);
+      res.status(500);
+      res.send({ message: 'unauthorized' });
+    }
+  });
+
+};
diff --git a/backend/api/index.mjs b/backend/api/index.mjs
new file mode 100644
index 0000000..afe3f01
--- /dev/null
+++ b/backend/api/index.mjs
@@ -0,0 +1,18 @@
+import { applyUserRoutes, applyUserRoutesPublic } from "./user.mjs";
+
+export const applyApiRoutes = (router) => {
+
+  router.get('/test', (req, res) => {
+    res.status(200);
+    res.send({ message: 'connection is working' });
+  });
+
+  applyUserRoutes(router);
+
+};
+
+export const applyPublicRoutes = (router) => {
+
+  applyUserRoutesPublic(router);
+
+};
diff --git a/backend/api/user.mjs b/backend/api/user.mjs
new file mode 100644
index 0000000..8a63985
--- /dev/null
+++ b/backend/api/user.mjs
@@ -0,0 +1,110 @@
+import { store } from "../store.mjs";
+
+export const applyUserRoutes = (router) => {
+
+  applyUserRoutesPublic(router);
+
+  router.post('/user/joinSession', async (req, res) => {
+    if (!req.body?.userId) {
+      res.status(400);
+      res.send({ message: 'userId is undefined' });
+      return;
+    }
+    const { userId } = req.body.userId;
+    if (res.locals.user.role === 'host') {
+      res.status(400);
+      res.send({ message: 'user is host' });
+      return;
+    }
+    const host = store.users.find(({ client }) => client.user.id === userId)
+    host.listeners.push(res.locals.user);
+    res.locals.user.role = 'listener';
+    res.locals.user.listeningTo = host;
+    res.status(200);
+    res.send({ message: 'joined' });
+  });
+
+  router.delete('/user/leaveSession', async (req, res) => {
+    if (res.locals.user.role === 'host') {
+      res.status(400);
+      res.send({ message: 'user is host' });
+      return;
+    }
+    const host = store.users.find(({ client }) => client.user.id === userId)
+    host.listeners.push(res.locals.user);
+    res.locals.user.role = 'none';
+    res.locals.user.listeningTo.listeners = res.locals.user.listeningTo.listeners.filter(
+      ({ client }) => client.user.id !== res.locals.user.client.user.id
+    );
+    res.locals.user.listeningTo = null;
+    res.status(200);
+    res.send({ message: 'left' });
+  });
+
+  router.get('/user/currentlyPlaying', async (req, res) => {
+    const currentlyPlaying = await res.locals.user.player?.getCurrentlyPlaying('track');
+    res.status(200);
+    res.send({ currentlyPlaying });
+  });
+
+  router.get('/user/role', (req, res) => {
+    res.status(200);
+    res.send({ role: res.locals.user?.role });
+  });
+
+  /*router.post('/user/role', async (req, res) => {
+    if (
+      req.body.role !== 'host' ||
+      req.body.role !== 'listener' ||
+      req.body.role !== 'none'
+    ) {
+      res.status(400);
+      res.send({ message: 'role value is invalid' });
+    }
+    const { role } = req.body;
+    try {
+      res.locals.user.listeners = [];
+      res.locals.user.role = role;
+      res.status(200);
+      res.send({ role });
+    } catch (e) {
+      res.status(500);
+      res.send({ message: 'server error' });
+    }
+  });*/
+
+};
+
+export const applyUserRoutesPublic = (router) => {
+
+  router.get('/users/:userId/info', async (req, res) => {
+    if (!req.params.userId) {
+      res.status(400);
+      res.send({ message: 'userId is missing' });
+    }
+    const { userId } = req.params;
+    const host = store.users.find(({ client }) => client.user.id === userId);
+    if (!host?.player) {
+      res.status(400);
+      res.send({ message: 'user is not registered' });
+      return;
+    }
+    try {
+      const currentlyPlaying = await host?.player?.getCurrentlyPlaying('track');
+      res.status(200);
+      res.send({
+        currentlyPlaying,
+        user: {
+          displayName: host.client.user.displayName,
+          totalFollowers: host.client.user.totalFollowers,
+          images: host.client.user.images,
+        },
+      });
+    } catch (e) {
+      console.log(e);
+      res.status(500);
+      res.send({ message: 'server error' });
+    }
+  });
+
+};
diff --git a/backend/index.mjs b/backend/index.mjs
new file mode 100644
index 0000000..bb306a4
--- /dev/null
+++ b/backend/index.mjs
@@ -0,0 +1,32 @@
+import express from "express";
+import { auth } from "./middlewares/auth.mjs";
+
+import { applyAuthRoutes } from "./api/auth.mjs";
+import { applyApiRoutes, applyPublicRoutes } from "./api/index.mjs";
+
+// express server
+const port = 3000;
+const app = express();
+
+const router = express.Router();
+const authRouter = express.Router();
+const publicRouter = express.Router();
+
+router.use(express.json());
+authRouter.use(express.json());
+publicRouter.use(express.json());
+
+app
+  .use('/api/v1', router)
+  .use('/api/auth', authRouter)
+  .use('/api/public', publicRouter);
+
+applyAuthRoutes(authRouter);
+
+router.use(auth);
+applyApiRoutes(router);
+
+applyPublicRoutes(publicRouter);
+
+app.listen(port);
+console.log('ready');
diff --git a/backend/lib/randomString.js b/backend/lib/randomString.js
new file mode 100644
index 0000000..b392e51
--- /dev/null
+++ b/backend/lib/randomString.js
@@ -0,0 +1,7 @@
+export const randomString = (length) => {
+  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+  let result = '';
+  for ( let i = 0; i < length; i++ )
+    result += characters.charAt(Math.floor(Math.random() * characters.length));
+  return result;
+}
diff --git a/backend/package-lock.json b/backend/package-lock.json
new file mode 100644
index 0000000..1cb070e
--- /dev/null
+++ b/backend/package-lock.json
@@ -0,0 +1,1154 @@
+{
+  "name": "spot2gether",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "spot2gether",
+      "version": "1.0.0",
+      "dependencies": {
+        "axios": "^0.27.2",
+        "express": "^4.18.1",
+        "spotify-api.js": "^9.2.3"
+      }
+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
+    },
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+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
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+    },
+    "node_modules/axios": {
+      "version": "0.27.2",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.27.2.tgz",
+      "integrity": "sha512-t+yRIyySRTp/wua5xEr+z1q60QmLq8ABsS5O9Me1AsE5dfKqgnCFzwiCZZ/cGNd1lq4/7akDWMxdhVlucjmnOQ==",
+      "dependencies": {
+        "follow-redirects": "^1.14.9",
+        "form-data": "^4.0.0"
+      }
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+      "engines": {
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+      }
+    },
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+      "funding": [
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+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
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+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
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+    },
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+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      }
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+    "spotify-api.js": {
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+}
diff --git a/backend/package.json b/backend/package.json
new file mode 100644
index 0000000..ae7819d
--- /dev/null
+++ b/backend/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "spot2gether",
+  "version": "0.1.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Alban David Becker",
+  "dependencies": {
+    "axios": "^0.27.2",
+    "express": "^4.18.1",
+    "spotify-api.js": "^9.2.3"
+  }
+}
diff --git a/backend/store.mjs b/backend/store.mjs
new file mode 100644
index 0000000..6d9a249
--- /dev/null
+++ b/backend/store.mjs
@@ -0,0 +1,6 @@
+export const store = {
+  users: [],
+  clientID: '02d74b98c7904d6498b0b79def49cc5c',
+  clientSecret: 'e43b819037eb48e6b190865fc2c47b21',
+  redirectURL: 'http://127.0.0.1:8083/auth/callback',
+};
diff --git a/docker-compose.yml b/docker-compose.yml
deleted file mode 100644
index 8490bf3..0000000
--- a/docker-compose.yml
+++ /dev/null
@@ -1,47 +0,0 @@
-version: '3'
-
-services:
-  redis:
-    image: redis:alpine
-    expose:
-      - 6379
-    restart: always
-    environment:
-      - REDIS_REPLICATION_MODE=master
-
-  backend:
-    image: node:alpine
-    restart: always
-    expose:
-      - 3000
-    volumes:
-      - ./backend/:/home/node/app/backend/
-      - ./helpers/:/home/node/app/helpers/
-    working_dir: /home/node/app/backend
-    environment:
-      - NODE_ENV=production
-    command: sh -c 'npm i && nodejs index.mjs'
-    links:
-      - redis
-    depends_on:
-      - redis
-
-  frontend:
-    image: node:alpine
-    volumes:
-      - ./frontend/:/home/node/app/frontend/
-    working_dir: /home/node/app/frontend
-    command: sh -c 'npm i --also=dev && npm run build'
-
-  nginx:
-    image: nginx:alpine
-    restart: always
-    volumes:
-      - ./nginx.conf:/etc/nginx/nginx.conf
-      - ./frontend/dist/:/var/www/html/
-    ports:
-      - "8083:8080"
-    links:
-      - backend
-    depends_on:
-      - backend