diff --git a/backend/src/controllers/groups.ts b/backend/src/controllers/groups.ts
index 8b26b810..5fd90553 100644
--- a/backend/src/controllers/groups.ts
+++ b/backend/src/controllers/groups.ts
@@ -1,5 +1,6 @@
 import { Request, Response } from 'express';
-import { getAllGroups, getGroup, getGroupSubmissions } from '../services/groups.js';
+import { createGroup, getAllGroups, getGroup, getGroupSubmissions } from '../services/groups.js';
+import { GroupDTO } from '../interfaces/group.js';
 
 // Typescript is annoywith with parameter forwarding from class.ts
 interface GroupParams {
@@ -54,6 +55,29 @@ export async function getAllGroupsHandler(
     });
 }
 
+export async function createGroupHandler(
+    req: Request,
+    res: Response,
+): Promise<void> {
+    const classid = req.params.classid;
+    const assignmentId = +req.params.assignmentid;
+
+    if (isNaN(assignmentId)) {
+        res.status(400).json({ error: 'Assignment id must be a number' });
+        return;
+    }
+
+    const groupData = req.body as GroupDTO;
+    const group = createGroup(groupData, classid, assignmentId);
+
+    if (!group) {
+        res.status(500).json({ error: "Something went wrong while creating group" });
+        return
+    }
+
+    res.status(201).json({ group: group });
+}
+
 export async function getGroupSubmissionsHandler(
     req: Request,
     res: Response,
diff --git a/backend/src/data/users/student-repository.ts b/backend/src/data/users/student-repository.ts
index 6835e430..d3be9081 100644
--- a/backend/src/data/users/student-repository.ts
+++ b/backend/src/data/users/student-repository.ts
@@ -1,4 +1,15 @@
 import { Student } from '../../entities/users/student.entity.js';
-import { UserRepository } from './user-repository.js';
+import { User } from '../../entities/users/user.entity.js';
+import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
+// import { UserRepository } from './user-repository.js';
 
-export class StudentRepository extends UserRepository<Student> {}
+// export class StudentRepository extends UserRepository<Student> {}
+
+export class StudentRepository extends DwengoEntityRepository<Student> {
+    public findByUsername(username: string): Promise<Student | null> {
+        return this.findOne({ username: username });
+    }
+    public deleteByUsername(username: string): Promise<void> {
+        return this.deleteWhere({ username: username });
+    }
+}
\ No newline at end of file
diff --git a/backend/src/data/users/teacher-repository.ts b/backend/src/data/users/teacher-repository.ts
index 4c4f7687..23ba559e 100644
--- a/backend/src/data/users/teacher-repository.ts
+++ b/backend/src/data/users/teacher-repository.ts
@@ -1,4 +1,12 @@
 import { Teacher } from '../../entities/users/teacher.entity.js';
+import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { UserRepository } from './user-repository.js';
 
-export class TeacherRepository extends UserRepository<Teacher> {}
+export class TeacherRepository extends DwengoEntityRepository<Teacher> {
+    public findByUsername(username: string): Promise<Teacher | null> {
+        return this.findOne({ username: username });
+    }
+    public deleteByUsername(username: string): Promise<void> {
+        return this.deleteWhere({ username: username });
+    }
+}
\ No newline at end of file
diff --git a/backend/src/entities/assignments/assignment.entity.ts b/backend/src/entities/assignments/assignment.entity.ts
index ecb02b90..015dcdc5 100644
--- a/backend/src/entities/assignments/assignment.entity.ts
+++ b/backend/src/entities/assignments/assignment.entity.ts
@@ -1,4 +1,5 @@
 import {
+    Collection,
     Entity,
     Enum,
     ManyToOne,
@@ -50,5 +51,5 @@ export class Assignment {
         },
         mappedBy: 'assignment',
     })
-    groups!: Group[];
+    groups!: Collection<Group>;
 }
diff --git a/backend/src/entities/assignments/group.entity.ts b/backend/src/entities/assignments/group.entity.ts
index 9c2ed2cf..446c0c0d 100644
--- a/backend/src/entities/assignments/group.entity.ts
+++ b/backend/src/entities/assignments/group.entity.ts
@@ -1,4 +1,4 @@
-import { Entity, ManyToMany, ManyToOne, PrimaryKey } from '@mikro-orm/core';
+import { Collection, Entity, ManyToMany, ManyToOne, PrimaryKey } from '@mikro-orm/core';
 import { Assignment } from './assignment.entity.js';
 import { Student } from '../users/student.entity.js';
 import { GroupRepository } from '../../data/assignments/group-repository.js';
@@ -17,13 +17,11 @@ export class Group {
     })
     assignment!: Assignment;
 
-    @PrimaryKey({ type: 'integer' })
-    groupNumber!: number;
+    @PrimaryKey({ type: 'integer', autoincrement: true })
+    groupNumber?: number;
 
-    @ManyToMany({
-        entity: () => {
-            return Student;
-        },
+    @ManyToMany(() => {
+        return Student;
     })
-    members!: Student[];
+    members!: Collection<Student>;
 }
diff --git a/backend/src/entities/users/student.entity.ts b/backend/src/entities/users/student.entity.ts
index 7ad8c9b3..c5632e84 100644
--- a/backend/src/entities/users/student.entity.ts
+++ b/backend/src/entities/users/student.entity.ts
@@ -19,4 +19,12 @@ export class Student extends User {
         return Group;
     })
     groups!: Collection<Group>;
+
+    constructor(
+        public username: string,
+        public firstName: string,
+        public lastName: string
+    ) {
+        super();
+    }
 }
diff --git a/backend/src/interfaces/group.ts b/backend/src/interfaces/group.ts
index ca7f687a..2dd3f2c1 100644
--- a/backend/src/interfaces/group.ts
+++ b/backend/src/interfaces/group.ts
@@ -11,7 +11,7 @@ export interface GroupDTO {
 export function mapToGroupDTO(group: Group): GroupDTO {
     return {
         assignment: mapToAssignmentDTO(group.assignment), // ERROR: , group.assignment.within),
-        groupNumber: group.groupNumber,
+        groupNumber: group.groupNumber!,
         members: group.members.map(mapToStudentDTO),
     };
 }
@@ -19,7 +19,7 @@ export function mapToGroupDTO(group: Group): GroupDTO {
 export function mapToGroupDTOId(group: Group): GroupDTO {
     return {
         assignment: group.assignment.id!,
-        groupNumber: group.groupNumber,
+        groupNumber: group.groupNumber!,
         members: group.members.map((member) => {
             return member.username;
         }),
diff --git a/backend/src/routes/groups.ts b/backend/src/routes/groups.ts
index c2a462ca..0c9692b0 100644
--- a/backend/src/routes/groups.ts
+++ b/backend/src/routes/groups.ts
@@ -1,11 +1,13 @@
 import express from 'express';
-import { getAllGroupsHandler, getGroupHandler, getGroupSubmissionsHandler } from '../controllers/groups.js';
+import { createGroupHandler, getAllGroupsHandler, getGroupHandler, getGroupSubmissionsHandler } from '../controllers/groups.js';
 
 const router = express.Router({ mergeParams: true });
 
 // Root endpoint used to search objects
 router.get('/', getAllGroupsHandler);
 
+router.post('/', createGroupHandler);
+
 // Information about a group (members, ... [TODO DOC])
 router.get('/:groupid', getGroupHandler);
 
diff --git a/backend/src/services/groups.ts b/backend/src/services/groups.ts
index a2af8e4a..2f2d0a14 100644
--- a/backend/src/services/groups.ts
+++ b/backend/src/services/groups.ts
@@ -1,9 +1,12 @@
+import { GroupRepository } from '../data/assignments/group-repository.js';
 import {
     getAssignmentRepository,
     getClassRepository,
     getGroupRepository,
+    getStudentRepository,
     getSubmissionRepository,
 } from '../data/repositories.js';
+import { Group } from '../entities/assignments/group.entity.js';
 import {
     GroupDTO,
     mapToGroupDTO,
@@ -51,6 +54,48 @@ export async function getGroup(
     return mapToGroupDTOId(group);
 }
 
+export async function createGroup(
+    groupData: GroupDTO,
+    classid: string,
+    assignmentNumber: number,
+): Promise<Group | null> {
+    const studentRepository = getStudentRepository();
+
+    const memberUsernames = groupData.members as string[] || []; // TODO check if groupdata.members is a list
+    const members = (await Promise.all([...memberUsernames].map(id => studentRepository.findByUsername(id))))
+        .filter(student => student != null);
+
+    console.log(members);
+
+    const classRepository = getClassRepository();
+    const cls = await classRepository.findById(classid);
+
+    if (!cls) {
+        return null;
+    }
+
+    const assignmentRepository = getAssignmentRepository();
+    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
+
+    if (!assignment) {
+        return null;
+    }
+
+    const groupRepository = getGroupRepository();
+    try {
+        const newGroup = groupRepository.create({
+            assignment: assignment,
+            members: members,
+        });
+        await groupRepository.save(newGroup);
+
+        return newGroup;
+    } catch(e) {
+        console.log(e);
+        return null;
+    }
+}
+
 export async function getAllGroups(
     classId: string,
     assignmentNumber: number,