diff --git a/backend/api/src/Database.ts b/backend/api/src/Database.ts
index 99d789d..aba63ad 100644
--- a/backend/api/src/Database.ts
+++ b/backend/api/src/Database.ts
@@ -2,23 +2,11 @@ import pgPromise from "pg-promise";
 
 
 export abstract class Database {
-    static db = null;
-    get db() {
-        if (Database.db == null) {
-            Database.db = pgPromise({})('postgres://postgres:postgres@db:5432/rr')
+    private static _db = null;
+    static get db() {
+        if (Database._db == null) {
+            Database._db = pgPromise({})('postgres://postgres:postgres@db:5432/rr')
         }
-        return Database.db;
+        return Database._db;
     }
-
-    static async catcher(request): Promise<any> {
-        let data;
-        try {
-            data = await request();
-        } catch (e) {
-            console.log((e as Error).message)
-        }
-        return data;
-    }
-
-
 }
\ No newline at end of file
diff --git a/backend/api/src/app.ts b/backend/api/src/app.ts
index 9b08420..fddff85 100644
--- a/backend/api/src/app.ts
+++ b/backend/api/src/app.ts
@@ -1,12 +1,8 @@
 import express from 'express';
-import {Database} from "./Database.js";
-
 import helmet from "helmet";
-import bodyParser from "body-parser";
 import morgan from 'morgan';
-import {UserDataManager} from "./manager/UserDataManager.js";
-import {UserDataPgPromiseSerializer} from "./manager/UserDataPgPromiseSerializer.js";
-import {leaderboardRouter} from "./leaderboardRouter.js";
+import {leaderboardRoute} from "./leaderboardRoute.js";
+import {userRoute} from "./userRoute.js";
 
 
 const app = express()
@@ -18,31 +14,13 @@ app.use(helmet())
 let morganFormatted = morgan('[:date[iso]] :method :url - :status')
 app.use(morganFormatted);
 
-app.use('/leaderboard', leaderboardRouter)
+app.use('/leaderboard', leaderboardRoute)
+app.use('/user', userRoute)
 
 app.get('/helloworld', (req, res) => {
     res.json({message: "Hello World!"})
 })
 
-app.get('/highscore', async (req, res) => {
-    let data = await Database.db.manyOrNone('SELECT * FROM lb_highscore;')
-        .catch((error) => console.log(error.message))
-    res.json(data)
-})
-
-app.get('/user/:username', async (req, res) => {
-    let data = await Database.db.oneOrNone(
-        'SELECT * FROM user_data WHERE username = $1;',
-        [req.params.username])
-        .catch((error) => console.log(error.message)
-    )
-    let userDataManager: UserDataManager = new UserDataManager(data, new UserDataPgPromiseSerializer);
-    res.json(userDataManager.userData);
-})
-
-
-
-
 
 app.listen(port, () => {
     console.log(`Server started at http://localhost:3000`);
diff --git a/backend/api/src/leaderboardRoute.ts b/backend/api/src/leaderboardRoute.ts
new file mode 100644
index 0000000..8267647
--- /dev/null
+++ b/backend/api/src/leaderboardRoute.ts
@@ -0,0 +1,23 @@
+import express from 'express';
+import {Database} from "./Database.js";
+import {TimeLeaderboardManager} from "./manager/TimeLeaderboardManager.js";
+import {HighscoreLeaderboardManager} from "./manager/HighscoreLeaderboardManager.js";
+import {
+    HighscoreLeaderboardPgPromiseSerializer
+} from "./serializer/pgpromise/HighscoreLeaderboardPgPromiseSerializer.js";
+import {TimeLeaderboardPgPromiseSerializer} from "./serializer/pgpromise/TimeLeaderboardPgPromiseSerializer.js";
+
+export const leaderboardRoute = express.Router()
+
+
+leaderboardRoute.get('/highscore', async (req, res) => {
+    let data = await Database.db.manyOrNone('SELECT * FROM lb_highscore INNER JOIN "user" ON user_id = id ORDER BY RANK;')
+    const leaderboardManager = new HighscoreLeaderboardManager(data, new HighscoreLeaderboardPgPromiseSerializer);
+    res.send(leaderboardManager.content)
+})
+
+leaderboardRoute.get('/totalplaytime', async (req, res) => {
+    let data = await Database.db.manyOrNone('SELECT * FROM lb_total_playtime INNER JOIN "user" ON user_id = id ORDER BY RANK;')
+    const leaderboardManager = new TimeLeaderboardManager(data, new TimeLeaderboardPgPromiseSerializer);
+    res.send(leaderboardManager.content)
+})
\ No newline at end of file
diff --git a/backend/api/src/leaderboardRouter.ts b/backend/api/src/leaderboardRouter.ts
deleted file mode 100644
index d4b0deb..0000000
--- a/backend/api/src/leaderboardRouter.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import express from 'express';
-export const leaderboardRouter = express.Router()
-
-
-leaderboardRouter.get('/highscore', (req, res) => {
-    res.send('highscore')
-})
-
-leaderboardRouter.get('/totalplaytime', (req, res) => {
-    res.send('total play time')
-})
\ No newline at end of file
diff --git a/backend/api/src/manager/HighscoreLeaderboardManager.ts b/backend/api/src/manager/HighscoreLeaderboardManager.ts
new file mode 100644
index 0000000..c1955e7
--- /dev/null
+++ b/backend/api/src/manager/HighscoreLeaderboardManager.ts
@@ -0,0 +1,32 @@
+import {Leaderboard} from "../model/Leaderboard.js";
+import {Manager} from "./Manager.js";
+import {HighscoreLeaderboardSerializer} from "../serializer/HighscoreLeaderboardSerializer.js";
+
+export class HighscoreLeaderboardManager implements Manager<Leaderboard<number>>{
+    private _content: Leaderboard<number>;
+    private _serializer: HighscoreLeaderboardSerializer;
+
+    constructor(rawData: any, serializer: HighscoreLeaderboardSerializer) {
+        this.serializer = serializer;
+        this._content = this.serializer.serialize(rawData);
+    }
+
+    //region getter&setter
+    get content() {
+        return this._content;
+    }
+
+    set content(value: Leaderboard<number>) {
+        this._content = value;
+    }
+
+    get serializer() {
+        return this._serializer;
+    }
+
+    set serializer(value: HighscoreLeaderboardSerializer) {
+        this._serializer = value;
+    }
+    //endregion
+
+}
\ No newline at end of file
diff --git a/backend/api/src/manager/LeaderBoardSerializer.ts b/backend/api/src/manager/LeaderBoardSerializer.ts
deleted file mode 100644
index 41a6a68..0000000
--- a/backend/api/src/manager/LeaderBoardSerializer.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export interface LeaderBoardSerializer {
-
-}
\ No newline at end of file
diff --git a/backend/api/src/manager/Manager.ts b/backend/api/src/manager/Manager.ts
new file mode 100644
index 0000000..6cd27e3
--- /dev/null
+++ b/backend/api/src/manager/Manager.ts
@@ -0,0 +1,8 @@
+import {Serializer} from "../serializer/Serializer.js";
+
+export interface Manager<T> {
+    get content(),
+    set content(value: T),
+    get serializer(),
+    set serializer(value: Serializer<T>),
+}
\ No newline at end of file
diff --git a/backend/api/src/manager/TimeLeaderboardManager.ts b/backend/api/src/manager/TimeLeaderboardManager.ts
new file mode 100644
index 0000000..df9ec0e
--- /dev/null
+++ b/backend/api/src/manager/TimeLeaderboardManager.ts
@@ -0,0 +1,34 @@
+import {Manager} from "./Manager.js";
+import {Leaderboard} from "../model/Leaderboard.js";
+import {Time} from "../model/Time.js";
+import {TimeLeaderboardSerializer} from "../serializer/TimeLeaderboardSerializer.js";
+import {TimeLeaderboardPgPromiseSerializer} from "../serializer/pgpromise/TimeLeaderboardPgPromiseSerializer.js";
+
+export class TimeLeaderboardManager implements Manager<Leaderboard<Time>> {
+    private _content: Leaderboard<Time>;
+    private _serializer: TimeLeaderboardPgPromiseSerializer
+
+    constructor(data: any, serializer: TimeLeaderboardSerializer) {
+        this._serializer = serializer;
+        this._content = this._serializer.serialize(data);
+    }
+
+    //region getter&setter
+    get content() {
+        return this._content;
+    }
+
+    set content(value: Leaderboard<Time>) {
+        this._content = value;
+    }
+
+    get serializer(): TimeLeaderboardPgPromiseSerializer {
+        return this._serializer;
+    }
+
+    set serializer(value: TimeLeaderboardPgPromiseSerializer) {
+        this._serializer = value;
+    }
+    //endregion
+
+}
\ No newline at end of file
diff --git a/backend/api/src/manager/UserDataManager.ts b/backend/api/src/manager/UserDataManager.ts
deleted file mode 100644
index c28aad8..0000000
--- a/backend/api/src/manager/UserDataManager.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import {UserData} from "../model/UserData.js";
-import {UserDataSerializer} from "./UserDataSerializer.js";
-
-export class UserDataManager {
-    private _userData: UserData;
-    private serializer: UserDataSerializer;
-
-    constructor(data: any, serializer: UserDataSerializer) {
-        this.serializer = serializer;
-        this._userData = this.serializer.serialize(data);
-    }
-
-    get userData(): UserData {
-        return this._userData;
-    }
-
-    set userData(value: UserData) {
-        this._userData = value;
-    }
-}
\ No newline at end of file
diff --git a/backend/api/src/manager/UserDataPgPromiseSerializer.ts b/backend/api/src/manager/UserDataPgPromiseSerializer.ts
deleted file mode 100644
index 4721740..0000000
--- a/backend/api/src/manager/UserDataPgPromiseSerializer.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import {UserData} from "../model/UserData.js";
-import {UserDataSerializer} from "./UserDataSerializer.js";
-
-export class UserDataPgPromiseSerializer implements UserDataSerializer {
-    deserialize(userData: UserData): any {
-        throw new Error("Method not implemented")
-    }
-
-    serialize(data: any): UserData {
-        return {
-            username: data.username,
-            highscore: data.highscore,
-            totalScore: data.total_score,
-            totalPlaytime: data.total_playtime,
-            averageScore: data.averageScore,
-            gamesPlayed: data.games_played,
-        }
-    }
-}
\ No newline at end of file
diff --git a/backend/api/src/manager/UserDataSerializer.ts b/backend/api/src/manager/UserDataSerializer.ts
deleted file mode 100644
index 9d54880..0000000
--- a/backend/api/src/manager/UserDataSerializer.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import {UserData} from "../model/UserData.js";
-
-export interface UserDataSerializer {
-    serialize(data: any): UserData,
-    deserialize(userData: UserData): any,
-}
\ No newline at end of file
diff --git a/backend/api/src/manager/UserScoresManager.ts b/backend/api/src/manager/UserScoresManager.ts
new file mode 100644
index 0000000..9ff2b0c
--- /dev/null
+++ b/backend/api/src/manager/UserScoresManager.ts
@@ -0,0 +1,33 @@
+import {UserScores} from "../model/UserScores.js";
+import { Serializer } from "../serializer/Serializer.js";
+import {UserScoresSerializer} from "../serializer/UserScoresSerializer.js";
+import {Manager} from "./Manager.js";
+
+export class UserScoresManager implements Manager<UserScores> {
+    private _content: UserScores;
+    private _serializer: UserScoresSerializer;
+
+    constructor(rawData: any, serializer: UserScoresSerializer) {
+        this.serializer = serializer;
+        this._content = this.serializer.serialize(rawData);
+    }
+
+    //region getter&setter
+    get content() {
+        return this._content;
+    }
+
+    set content(value: UserScores) {
+        this._content = value;
+    }
+
+    get serializer() {
+        return this._serializer
+    }
+
+    set serializer(value: Serializer<UserScores>) {
+        this._serializer = value
+    }
+    //endregion
+
+}
\ No newline at end of file
diff --git a/backend/api/src/model/Leaderboard.ts b/backend/api/src/model/Leaderboard.ts
index 406962a..e82321e 100644
--- a/backend/api/src/model/Leaderboard.ts
+++ b/backend/api/src/model/Leaderboard.ts
@@ -1,5 +1,7 @@
-import {LeaderboardEntry} from "./LeaderboardEntry.js";
+export type Leaderboard<T> = LeaderboardEntry<T>[];
 
-export class Leaderboard<T> {
-    content: LeaderboardEntry<T>[];
+export interface LeaderboardEntry<T> {
+    rank: number,
+    username: string,
+    score: T,
 }
\ No newline at end of file
diff --git a/backend/api/src/model/LeaderboardEntry.ts b/backend/api/src/model/LeaderboardEntry.ts
deleted file mode 100644
index b43f6dd..0000000
--- a/backend/api/src/model/LeaderboardEntry.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-export interface LeaderboardEntry<T> {
-    rank: number,
-    username: string,
-    score: T,
-}
\ No newline at end of file
diff --git a/backend/api/src/model/UserData.ts b/backend/api/src/model/UserScores.ts
similarity index 83%
rename from backend/api/src/model/UserData.ts
rename to backend/api/src/model/UserScores.ts
index 8845351..bff5208 100644
--- a/backend/api/src/model/UserData.ts
+++ b/backend/api/src/model/UserScores.ts
@@ -1,4 +1,4 @@
-export interface UserData {
+export interface UserScores {
     username: string,
     highscore: number,
     totalScore: number,
diff --git a/backend/api/src/serializer/HighscoreLeaderboardSerializer.ts b/backend/api/src/serializer/HighscoreLeaderboardSerializer.ts
new file mode 100644
index 0000000..94785e5
--- /dev/null
+++ b/backend/api/src/serializer/HighscoreLeaderboardSerializer.ts
@@ -0,0 +1,4 @@
+import {Serializer} from "./Serializer.js";
+import {Leaderboard} from "../model/Leaderboard.js";
+
+export interface HighscoreLeaderboardSerializer extends Serializer<Leaderboard<number>> {}
\ No newline at end of file
diff --git a/backend/api/src/serializer/Serializer.ts b/backend/api/src/serializer/Serializer.ts
new file mode 100644
index 0000000..d0f5e33
--- /dev/null
+++ b/backend/api/src/serializer/Serializer.ts
@@ -0,0 +1,4 @@
+export interface Serializer<T> {
+    serialize(rawData: any): T,
+    deserialize(parsedData: T): any,
+}
\ No newline at end of file
diff --git a/backend/api/src/serializer/TimeLeaderboardSerializer.ts b/backend/api/src/serializer/TimeLeaderboardSerializer.ts
new file mode 100644
index 0000000..25fe823
--- /dev/null
+++ b/backend/api/src/serializer/TimeLeaderboardSerializer.ts
@@ -0,0 +1,5 @@
+import {Serializer} from "./Serializer.js";
+import {Leaderboard} from "../model/Leaderboard.js";
+import {Time} from "../model/Time.js";
+
+export interface TimeLeaderboardSerializer extends Serializer<Leaderboard<Time>> {}
\ No newline at end of file
diff --git a/backend/api/src/serializer/UserScoresSerializer.ts b/backend/api/src/serializer/UserScoresSerializer.ts
new file mode 100644
index 0000000..95c346c
--- /dev/null
+++ b/backend/api/src/serializer/UserScoresSerializer.ts
@@ -0,0 +1,4 @@
+import {UserScores} from "../model/UserScores.js";
+import {Serializer} from "./Serializer.js";
+
+export interface UserScoresSerializer extends Serializer<UserScores>{}
\ No newline at end of file
diff --git a/backend/api/src/serializer/pgpromise/HighscoreLeaderboardPgPromiseSerializer.ts b/backend/api/src/serializer/pgpromise/HighscoreLeaderboardPgPromiseSerializer.ts
new file mode 100644
index 0000000..927eb98
--- /dev/null
+++ b/backend/api/src/serializer/pgpromise/HighscoreLeaderboardPgPromiseSerializer.ts
@@ -0,0 +1,20 @@
+import {HighscoreLeaderboardSerializer} from "../HighscoreLeaderboardSerializer.js";
+import {Leaderboard, LeaderboardEntry} from "../../model/Leaderboard.js";
+
+export class HighscoreLeaderboardPgPromiseSerializer implements HighscoreLeaderboardSerializer {
+    deserialize(parsedData: Leaderboard<number>): any {
+        throw new Error("Method not implemented.")
+    }
+
+    serialize(rawData: any): Leaderboard<number> {
+        return rawData.map((item) => {
+            let newItem: LeaderboardEntry<number> = {
+                rank: item.rank,
+                username: item.name,
+                score: item.highscore,
+            }
+            return newItem
+        });
+    }
+
+}
\ No newline at end of file
diff --git a/backend/api/src/serializer/pgpromise/TimeLeaderboardPgPromiseSerializer.ts b/backend/api/src/serializer/pgpromise/TimeLeaderboardPgPromiseSerializer.ts
new file mode 100644
index 0000000..5e38931
--- /dev/null
+++ b/backend/api/src/serializer/pgpromise/TimeLeaderboardPgPromiseSerializer.ts
@@ -0,0 +1,20 @@
+import {TimeLeaderboardSerializer} from "../TimeLeaderboardSerializer.js";
+import {Leaderboard, LeaderboardEntry} from "../../model/Leaderboard.js";
+import {Time} from "../../model/Time.js";
+
+export class TimeLeaderboardPgPromiseSerializer implements TimeLeaderboardSerializer {
+    deserialize(parsedData: Leaderboard<Time>): any {
+        throw new Error("Method not implemented.")
+    }
+
+    serialize(rawData: any): Leaderboard<Time> {
+        return rawData.map((item) => {
+            let newItem: LeaderboardEntry<Time> = {
+                rank: item.rank,
+                username: item.name,
+                score: item.total_playtime,
+            }
+            return newItem
+        });
+    }
+}
\ No newline at end of file
diff --git a/backend/api/src/serializer/pgpromise/UserScoresPgPromiseSerializer.ts b/backend/api/src/serializer/pgpromise/UserScoresPgPromiseSerializer.ts
new file mode 100644
index 0000000..959a193
--- /dev/null
+++ b/backend/api/src/serializer/pgpromise/UserScoresPgPromiseSerializer.ts
@@ -0,0 +1,20 @@
+import {UserScores} from "../../model/UserScores.js";
+import {UserScoresSerializer} from "../UserScoresSerializer.js";
+
+export class UserScoresPgPromiseSerializer implements UserScoresSerializer {
+    deserialize(parsedData: UserScores): any {
+        throw new Error("Method not implemented");
+    }
+
+    serialize(rawData: any): UserScores {
+        return {
+            username: rawData.name,
+            highscore: rawData.highscore,
+            totalScore: rawData.total_score,
+            totalPlaytime: rawData.total_playtime,
+            averageScore: rawData.averageScore,
+            gamesPlayed: rawData.games_played,
+        };
+    }
+
+}
\ No newline at end of file
diff --git a/backend/api/src/userRoute.ts b/backend/api/src/userRoute.ts
new file mode 100644
index 0000000..179cca7
--- /dev/null
+++ b/backend/api/src/userRoute.ts
@@ -0,0 +1,30 @@
+import express from "express";
+import {Database} from "./Database.js";
+import {UserScoresManager} from "./manager/UserScoresManager.js";
+import {UserScoresPgPromiseSerializer} from "./serializer/pgpromise/UserScoresPgPromiseSerializer.js";
+import bodyParser from "body-parser";
+
+export const userRoute = express.Router()
+
+userRoute.use(bodyParser.json)
+
+userRoute.get('/:username/scores', async (req, res) => {
+    let data = await Database.db.oneOrNone(
+        'SELECT * FROM user_scores INNER JOIN "user" ON user_scores.user_id = "user".id WHERE "user".name = $1;',
+        [req.params.username])
+        .catch((error) => console.log(error.message)
+    )
+    let userDataManager: UserScoresManager = new UserScoresManager(data, new UserScoresPgPromiseSerializer);
+    res.json(userDataManager.content);
+})
+
+userRoute.post('/register', async (req, res) => {
+    if (req.body.name == undefined) {
+        res.status(400).send("'name' was not defined");
+        return;
+    }
+    await Database.db.none(
+        'INSERT INTO "user" (name) VALUES ($1);', [req.body.name]
+    );
+    res.status(200).send();
+})
\ No newline at end of file
diff --git a/docker-compose.yml b/docker-compose.yml
index c60a011..f21adcc 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -15,6 +15,8 @@ services:
 
   api:
     build: backend/api
+    depends_on:
+      - db
     container_name: express-api
     ports:
       - "${EXPRESS_PORT}:3000"