diff --git a/backend/src/database/connection.ts b/backend/src/database/connection.ts
deleted file mode 100644
index 584b657d2..000000000
--- a/backend/src/database/connection.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import { createConnection, Connection } from 'mysql2/promise'
-import CONFIG from '../config'
-
-const connection = async (): Promise<Connection> => {
-  const con = await createConnection({
-    host: CONFIG.DB_HOST,
-    port: CONFIG.DB_PORT,
-    user: CONFIG.DB_USER,
-    password: CONFIG.DB_PASSWORD,
-    database: CONFIG.DB_DATABASE,
-  })
-
-  await con.connect()
-
-  return con
-}
-
-export default connection
diff --git a/backend/src/graphql/resolvers/index.ts b/backend/src/graphql/resolvers/index.ts
new file mode 100644
index 000000000..f42829645
--- /dev/null
+++ b/backend/src/graphql/resolvers/index.ts
@@ -0,0 +1,19 @@
+import { UserResolver } from './UserResolver'
+import { BalanceResolver } from './BalanceResolver'
+import { GdtResolver } from './GdtResolver'
+import { TransactionResolver } from './TransactionResolver'
+import { KlicktippResolver } from './KlicktippResolver'
+import { NonEmptyArray } from 'type-graphql'
+
+export { UserResolver, BalanceResolver, GdtResolver, TransactionResolver, KlicktippResolver }
+
+// eslint-disable-next-line @typescript-eslint/ban-types
+const resolvers = (): NonEmptyArray<Function> => [
+  UserResolver,
+  BalanceResolver,
+  GdtResolver,
+  TransactionResolver,
+  KlicktippResolver,
+]
+
+export default resolvers
diff --git a/backend/src/graphql/schema.ts b/backend/src/graphql/schema.ts
new file mode 100644
index 000000000..f18a3bea6
--- /dev/null
+++ b/backend/src/graphql/schema.ts
@@ -0,0 +1,14 @@
+import { GraphQLSchema } from 'graphql'
+import { buildSchema } from 'type-graphql'
+
+import resolvers from './resolvers'
+import { isAuthorized } from '../auth/auth'
+
+const schema = async (): Promise<GraphQLSchema> => {
+  return buildSchema({
+    resolvers: resolvers(),
+    authChecker: isAuthorized,
+  })
+}
+
+export default schema
diff --git a/backend/src/index.ts b/backend/src/index.ts
index bd58f8c86..1c3814096 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -2,98 +2,58 @@
 
 import 'reflect-metadata'
 import express from 'express'
-import cors from 'cors'
-import { buildSchema } from 'type-graphql'
 import { ApolloServer } from 'apollo-server-express'
-import { RowDataPacket } from 'mysql2/promise'
 
-import connection from './database/connection'
-import typeOrmConnection from './typeorm/connection'
+// config
 import CONFIG from './config'
 
-// TODO move to extern
-import { UserResolver } from './graphql/resolvers/UserResolver'
-import { BalanceResolver } from './graphql/resolvers/BalanceResolver'
-import { GdtResolver } from './graphql/resolvers/GdtResolver'
-import { TransactionResolver } from './graphql/resolvers/TransactionResolver'
-import { KlicktippResolver } from './graphql/resolvers/KlicktippResolver'
+// database
+import connection from './typeorm/connection'
+import getDBVersion from './typeorm/getDBVersion'
 
-import { isAuthorized } from './auth/auth'
+// server
+import cors from './server/cors'
+import context from './server/context'
+import plugins from './server/plugins'
+
+// graphql
+import schema from './graphql/schema'
 
 // TODO implement
 // import queryComplexity, { simpleEstimator, fieldConfigEstimator } from "graphql-query-complexity";
 
 const DB_VERSION = '0001-init_db'
 
-const context = (args: any) => {
-  const authorization = args.req.headers.authorization
-  let token = null
-  if (authorization) {
-    token = authorization.replace(/^Bearer /, '')
-  }
-  const context = {
-    token,
-    setHeaders: [],
-  }
-  return context
-}
-
 async function main() {
-  // check for correct database version
+  // open mysql connection
   const con = await connection()
-  const [rows] = await con.query(`SELECT * FROM migrations ORDER BY version DESC LIMIT 1;`)
-  if (
-    (<RowDataPacket>rows).length === 0 ||
-    !(<RowDataPacket>rows)[0].fileName ||
-    (<RowDataPacket>rows)[0].fileName.indexOf(DB_VERSION) === -1
-  ) {
-    throw new Error(`Wrong database version - the backend requires '${DB_VERSION}'`)
+  if (!con || !con.isConnected) {
+    throw new Error(`Couldn't open connection to database`)
   }
 
-  const toCon = await typeOrmConnection()
-  if (!toCon.isConnected) {
-    throw new Error(`Couldn't open typeorm db connection`)
-  }
-
-  const schema = await buildSchema({
-    resolvers: [UserResolver, BalanceResolver, TransactionResolver, GdtResolver, KlicktippResolver],
-    authChecker: isAuthorized,
-  })
-
-  // Graphiql interface
-  let playground = false
-  if (CONFIG.GRAPHIQL) {
-    playground = true
+  // check for correct database version
+  const dbVersion = await getDBVersion()
+  if (!dbVersion || dbVersion.indexOf(DB_VERSION) === -1) {
+    throw new Error(
+      `Wrong database version - the backend requires '${DB_VERSION}' but found '${
+        dbVersion || 'None'
+      }'`,
+    )
   }
 
   // Express Server
   const server = express()
 
-  const corsOptions = {
-    origin: '*',
-    exposedHeaders: ['token'],
-  }
-
-  server.use(cors(corsOptions))
-
-  const plugins = [
-    {
-      requestDidStart() {
-        return {
-          willSendResponse(requestContext: any) {
-            const { setHeaders = [] } = requestContext.context
-            setHeaders.forEach(({ key, value }: { [key: string]: string }) => {
-              requestContext.response.http.headers.append(key, value)
-            })
-            return requestContext
-          },
-        }
-      },
-    },
-  ]
+  // cors
+  server.use(cors)
 
   // Apollo Server
-  const apollo = new ApolloServer({ schema, playground, context, plugins })
+  const apollo = new ApolloServer({
+    schema: await schema(),
+    playground: CONFIG.GRAPHIQL,
+    context,
+    plugins,
+  })
   apollo.applyMiddleware({ app: server })
 
   // Start Server
diff --git a/backend/src/server/context.ts b/backend/src/server/context.ts
new file mode 100644
index 000000000..2ad4b520d
--- /dev/null
+++ b/backend/src/server/context.ts
@@ -0,0 +1,14 @@
+const context = (args: any) => {
+  const authorization = args.req.headers.authorization
+  let token = null
+  if (authorization) {
+    token = authorization.replace(/^Bearer /, '')
+  }
+  const context = {
+    token,
+    setHeaders: [],
+  }
+  return context
+}
+
+export default context
diff --git a/backend/src/server/cors.ts b/backend/src/server/cors.ts
new file mode 100644
index 000000000..e76ed1591
--- /dev/null
+++ b/backend/src/server/cors.ts
@@ -0,0 +1,8 @@
+import cors from 'cors'
+
+const corsOptions = {
+  origin: '*',
+  exposedHeaders: ['token'],
+}
+
+export default cors(corsOptions)
diff --git a/backend/src/server/plugins.ts b/backend/src/server/plugins.ts
new file mode 100644
index 000000000..6b27d19ea
--- /dev/null
+++ b/backend/src/server/plugins.ts
@@ -0,0 +1,17 @@
+const plugins = [
+  {
+    requestDidStart() {
+      return {
+        willSendResponse(requestContext: any) {
+          const { setHeaders = [] } = requestContext.context
+          setHeaders.forEach(({ key, value }: { [key: string]: string }) => {
+            requestContext.response.http.headers.append(key, value)
+          })
+          return requestContext
+        },
+      }
+    },
+  },
+]
+
+export default plugins
diff --git a/backend/src/typeorm/connection.ts b/backend/src/typeorm/connection.ts
index b108c5ef5..db7dbcb29 100644
--- a/backend/src/typeorm/connection.ts
+++ b/backend/src/typeorm/connection.ts
@@ -2,18 +2,21 @@ import { createConnection, Connection } from 'typeorm'
 import CONFIG from '../config'
 import path from 'path'
 
-const connection = async (): Promise<Connection> => {
-  const con = await createConnection({
-    name: 'default',
-    type: 'mysql',
-    host: CONFIG.DB_HOST,
-    port: CONFIG.DB_PORT,
-    username: CONFIG.DB_USER,
-    password: CONFIG.DB_PASSWORD,
-    database: CONFIG.DB_DATABASE,
-    entities: [path.join(__dirname, 'entity', '*.ts')],
-    synchronize: false,
-  })
+const connection = async (): Promise<Connection | null> => {
+  let con = null
+  try {
+    con = await createConnection({
+      name: 'default',
+      type: 'mysql',
+      host: CONFIG.DB_HOST,
+      port: CONFIG.DB_PORT,
+      username: CONFIG.DB_USER,
+      password: CONFIG.DB_PASSWORD,
+      database: CONFIG.DB_DATABASE,
+      entities: [path.join(__dirname, 'entity', '*.ts')],
+      synchronize: false,
+    })
+  } catch (error) {}
 
   return con
 }
diff --git a/backend/src/typeorm/entity/Migration.ts b/backend/src/typeorm/entity/Migration.ts
new file mode 100644
index 000000000..f1163cfbc
--- /dev/null
+++ b/backend/src/typeorm/entity/Migration.ts
@@ -0,0 +1,13 @@
+import { BaseEntity, Entity, PrimaryGeneratedColumn, Column } from 'typeorm'
+
+@Entity('migrations')
+export class Migration extends BaseEntity {
+  @PrimaryGeneratedColumn() // This is actually not a primary column
+  version: number
+
+  @Column({ length: 256, nullable: true, default: null })
+  fileName: string
+
+  @Column({ type: 'datetime', default: () => 'CURRENT_TIMESTAMP' })
+  date: Date
+}
diff --git a/backend/src/typeorm/getDBVersion.ts b/backend/src/typeorm/getDBVersion.ts
new file mode 100644
index 000000000..497a6da5e
--- /dev/null
+++ b/backend/src/typeorm/getDBVersion.ts
@@ -0,0 +1,15 @@
+import { getConnection } from 'typeorm'
+import { Migration } from './entity/Migration'
+
+const getDBVersion = async (): Promise<string | null> => {
+  const connection = getConnection()
+  const migrations = connection.getRepository(Migration)
+  try {
+    const dbVersion = await migrations.findOne({ order: { version: 'DESC' } })
+    return dbVersion ? dbVersion.fileName : null
+  } catch (error) {
+    return null
+  }
+}
+
+export default getDBVersion