diff --git a/backend/src/app.ts b/backend/src/app.ts
index 8f01dea6..37cfec67 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -3,21 +3,23 @@ import { initORM } from './orm.js';
 import { EnvVars, getNumericEnvVar } from './util/envvars.js';
 
 import themeRoutes from './routes/themes.js';
-import learningPathRoutes from './routes/learningPaths.js';
-import learningObjectRoutes from './routes/learningObjects.js';
+import learningPathRoutes from './routes/learning-paths.js';
+import learningObjectRoutes from './routes/learning-objects.js';
 
-import studentRouter from './routes/student.js';
-import groupRouter from './routes/group.js';
-import submissionRouter from './routes/submission.js';
-import classRouter from './routes/class.js';
-import questionRouter from './routes/question.js';
-import loginRouter from './routes/login.js';
+import studentRoutes from './routes/students.js';
+import teacherRoutes from './routes/teachers.js'
+import groupRoutes from './routes/groups.js';
+import submissionRoutes from './routes/submissions.js';
+import classRoutes from './routes/classes.js';
+import questionRoutes from './routes/questions.js';
 
 const app: Express = express();
 const port: string | number = getNumericEnvVar(EnvVars.Port);
 
 app.use(express.json());
 
+app.use(express.json());
+
 // TODO Replace with Express routes
 app.get('/', (_, res: Response) => {
     res.json({
@@ -25,12 +27,12 @@ app.get('/', (_, res: Response) => {
     });
 });
 
-app.use('/student', studentRouter);
-app.use('/group', groupRouter);
-app.use('/submission', submissionRouter);
-app.use('/class', classRouter);
-app.use('/question', questionRouter);
-app.use('/login', loginRouter);
+app.use('/student', studentRoutes);
+app.use('/teacher', teacherRoutes);
+app.use('/group', groupRoutes);
+app.use('/submission', submissionRoutes);
+app.use('/class', classRoutes);
+app.use('/question', questionRoutes);
 
 app.use('/theme', themeRoutes);
 app.use('/learningPath', learningPathRoutes);
diff --git a/backend/src/controllers/classes.ts b/backend/src/controllers/classes.ts
index 9f8f4669..6fb9d7f4 100644
--- a/backend/src/controllers/classes.ts
+++ b/backend/src/controllers/classes.ts
@@ -1,5 +1,6 @@
 import { Request, Response } from 'express';
-import { getAllClasses, getClass, getClassStudents, getClassTeacherInvitations } from '../services/class.js';
+import { getAllClasses, getClass, getClassStudents, getClassStudentsIds, getClassTeacherInvitations } from '../services/class.js';
+import { ClassDTO } from '../interfaces/classes.js';
 
 export async function getAllClassesHandler(
     req: Request,
@@ -47,7 +48,9 @@ export async function getClassStudentsHandler(
     const classId = req.params.id;
     const full = req.query.full === "true";
 
-    const students = await getClassStudents(classId, full);
+    let students = full
+        ? await getClassStudents(classId)
+        : await getClassStudentsIds(classId);
 
     res.json({
         students: students,
diff --git a/backend/src/controllers/learningObjects.ts b/backend/src/controllers/learning-objects.ts
similarity index 93%
rename from backend/src/controllers/learningObjects.ts
rename to backend/src/controllers/learning-objects.ts
index 4295326a..c8a51734 100644
--- a/backend/src/controllers/learningObjects.ts
+++ b/backend/src/controllers/learning-objects.ts
@@ -3,9 +3,9 @@ import {
     getLearningObjectById,
     getLearningObjectIdsFromPath,
     getLearningObjectsFromPath,
-} from '../services/learningObjects.js';
+} from '../services/learning-objects.js';
 import { FALLBACK_LANG } from '../config.js';
-import { FilteredLearningObject } from '../interfaces/learningPath';
+import { FilteredLearningObject } from '../interfaces/learning-path';
 
 export async function getAllLearningObjects(
     req: Request,
diff --git a/backend/src/controllers/learningPaths.ts b/backend/src/controllers/learning-paths.ts
similarity index 97%
rename from backend/src/controllers/learningPaths.ts
rename to backend/src/controllers/learning-paths.ts
index 903451be..fb0fd07c 100644
--- a/backend/src/controllers/learningPaths.ts
+++ b/backend/src/controllers/learning-paths.ts
@@ -4,7 +4,7 @@ import { FALLBACK_LANG } from '../config.js';
 import {
     fetchLearningPaths,
     searchLearningPaths,
-} from '../services/learningPaths.js';
+} from '../services/learning-paths.js';
 /**
  * Fetch learning paths based on query parameters.
  */
diff --git a/backend/src/controllers/teachers.ts b/backend/src/controllers/teachers.ts
new file mode 100644
index 00000000..d3b6a4db
--- /dev/null
+++ b/backend/src/controllers/teachers.ts
@@ -0,0 +1,155 @@
+import { Request, Response } from 'express';
+import {
+    createTeacher,
+    deleteTeacher,
+    getTeacherByUsername,
+    getClassesByTeacher,
+    getClassIdsByTeacher,
+    getAllTeachers,
+    getAllTeachersIds, getStudentsByTeacher, getStudentIdsByTeacher, getQuestionsByTeacher, getQuestionIdsByTeacher
+} from '../services/teachers.js';
+import {TeacherDTO} from "../interfaces/teacher";
+import {ClassDTO} from "../interfaces/class";
+import {StudentDTO} from "../interfaces/student";
+import {QuestionDTO, QuestionId} from "../interfaces/question";
+
+export async function getTeacherHandler(req: Request, res: Response): Promise<void> {
+    try {
+        const full = req.query.full === 'true';
+        const username = req.query.username as string;
+
+        if (username){
+            const teacher = await getTeacherByUsername(username);
+            if (!teacher){
+                res.status(404).json({ error: `Teacher with username '${username}' not found.` });
+                return;
+            }
+            res.json(teacher);
+            return;
+        }
+
+        let teachers: TeacherDTO[] | string[];
+
+        if (full) teachers = await getAllTeachers();
+        else teachers = await getAllTeachersIds();
+
+        res.json(teachers);
+    } catch (error) {
+        console.error("❌ Error fetching teachers:", error);
+        res.status(500).json({ error: "Internal server error" });
+    }
+}
+
+export async function createTeacherHandler(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const teacherData = req.body as TeacherDTO;
+
+        if (!teacherData.username || !teacherData.firstName || !teacherData.lastName) {
+            res.status(400).json({ error: 'Missing required fields: username, firstName, lastName' });
+            return;
+        }
+
+        const newTeacher = await createTeacher(teacherData);
+        res.status(201).json(newTeacher);
+    } catch (error) {
+        console.error('Error creating teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+export async function deleteTeacherHandler(
+    req: Request,
+    res: Response
+): Promise<void> {
+    try {
+        const username = req.params.username as string;
+
+        if (!username) {
+            res.status(400).json({ error: 'Missing required field: username' });
+            return;
+        }
+
+        const deletedTeacher = await deleteTeacher(username);
+
+        if (!deletedTeacher) {
+            res.status(400).json({ error: `Did not find teacher with username ${username}` });
+            return;
+        }
+
+        res.status(201).json(deletedTeacher);
+    } catch (error) {
+        console.error('Error deleting teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+export async function getTeacherClassHandler(req: Request, res: Response): Promise<void> {
+    try {
+        const username = req.params.username as string;
+        const full = req.query.full === 'true';
+
+        if (!username) {
+            res.status(400).json({ error: 'Missing required field: username' });
+            return;
+        }
+
+        let classes: ClassDTO[] | string[];
+
+        if (full) classes = await getClassesByTeacher(username);
+        else classes = await getClassIdsByTeacher(username);
+
+        res.status(201).json(classes);
+    } catch (error) {
+        console.error('Error fetching classes by teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+export async function getTeacherStudentHandler(req: Request, res: Response): Promise<void> {
+    try {
+        const username = req.params.username as string;
+        const full = req.query.full === 'true';
+
+        if (!username) {
+            res.status(400).json({ error: 'Missing required field: username' });
+            return;
+        }
+
+        let students: StudentDTO[] | string[];
+
+        if (full) students = await getStudentsByTeacher(username);
+        else students = await getStudentIdsByTeacher(username);
+
+        res.status(201).json(students);
+    } catch (error) {
+        console.error('Error fetching students by teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+export async function getTeacherQuestionHandler(req: Request, res: Response): Promise<void> {
+    try {
+        const username = req.params.username as string;
+        const full = req.query.full === 'true';
+
+        if (!username) {
+            res.status(400).json({ error: 'Missing required field: username' });
+            return;
+        }
+
+        let questions: QuestionDTO[] | QuestionId[];
+
+        if (full) questions = await getQuestionsByTeacher(username);
+        else questions = await getQuestionIdsByTeacher(username);
+
+        res.status(201).json(questions);
+    } catch (error) {
+        console.error('Error fetching questions by teacher:', error);
+        res.status(500).json({ error: 'Internal server error' });
+    }
+}
+
+
diff --git a/backend/src/controllers/themes.ts b/backend/src/controllers/themes.ts
index 4b59751e..208b27d1 100644
--- a/backend/src/controllers/themes.ts
+++ b/backend/src/controllers/themes.ts
@@ -1,6 +1,6 @@
 import { Request, Response } from 'express';
 import { themes } from '../data/themes.js';
-import { loadTranslations } from "../util/translationHelper.js";
+import { loadTranslations } from "../util/translation-helper.js";
 import { FALLBACK_LANG } from '../config.js';
 
 interface Translations {
diff --git a/backend/src/data/classes/class-repository.ts b/backend/src/data/classes/class-repository.ts
index cd0e44fc..9fd50d75 100644
--- a/backend/src/data/classes/class-repository.ts
+++ b/backend/src/data/classes/class-repository.ts
@@ -1,6 +1,7 @@
 import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Class } from '../../entities/classes/class.entity.js';
 import { Student } from '../../entities/users/student.entity.js';
+import {Teacher} from "../../entities/users/teacher.entity";
 
 export class ClassRepository extends DwengoEntityRepository<Class> {
     public findById(id: string): Promise<Class | null> {
@@ -18,4 +19,11 @@ export class ClassRepository extends DwengoEntityRepository<Class> {
             { populate: ["students", "teachers"] } // voegt student en teacher objecten toe
         )
     }
+
+    public findByTeacher(teacher: Teacher): Promise<Class[]> {
+        return this.find(
+            { teachers: teacher },
+            { populate: ["students", "teachers"] }
+        );
+    }
 }
diff --git a/backend/src/data/content/learning-object-repository.ts b/backend/src/data/content/learning-object-repository.ts
index 5d30b956..d8b07943 100644
--- a/backend/src/data/content/learning-object-repository.ts
+++ b/backend/src/data/content/learning-object-repository.ts
@@ -1,6 +1,7 @@
 import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { LearningObject } from '../../entities/content/learning-object.entity.js';
 import { LearningObjectIdentifier } from '../../entities/content/learning-object-identifier.js';
+import {Teacher} from "../../entities/users/teacher.entity";
 
 export class LearningObjectRepository extends DwengoEntityRepository<LearningObject> {
     public findByIdentifier(
@@ -13,4 +14,11 @@ export class LearningObjectRepository extends DwengoEntityRepository<LearningObj
         });
     }
     // This repository is read-only for now since creating own learning object is an extension feature.
+
+    public findAllByTeacher(teacher: Teacher): Promise<LearningObject[]> {
+        return this.find(
+            { admins: teacher },
+            { populate: ['admins'] } // Make sure to load admin relations
+        );
+    }
 }
diff --git a/backend/src/data/questions/question-repository.ts b/backend/src/data/questions/question-repository.ts
index 517305f1..05430ddd 100644
--- a/backend/src/data/questions/question-repository.ts
+++ b/backend/src/data/questions/question-repository.ts
@@ -2,6 +2,7 @@ import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Question } from '../../entities/questions/question.entity.js';
 import { LearningObjectIdentifier } from '../../entities/content/learning-object-identifier.js';
 import { Student } from '../../entities/users/student.entity.js';
+import {LearningObject} from "../../entities/content/learning-object.entity";
 
 export class QuestionRepository extends DwengoEntityRepository<Question> {
     public createQuestion(question: {
@@ -42,4 +43,17 @@ export class QuestionRepository extends DwengoEntityRepository<Question> {
             sequenceNumber: sequenceNumber,
         });
     }
+
+    public async findAllByLearningObjects(learningObjects: LearningObject[]): Promise<Question[]> {
+        const objectIdentifiers = learningObjects.map(lo => ({
+                learningObjectHruid: lo.hruid,
+                learningObjectLanguage: lo.language,
+                learningObjectVersion: lo.version
+            }));
+
+        return this.findAll({
+            where: { $or: objectIdentifiers },
+            orderBy: { timestamp: 'ASC' },
+        });
+    }
 }
diff --git a/backend/src/interfaces/assignments.ts b/backend/src/interfaces/assignment.ts
similarity index 100%
rename from backend/src/interfaces/assignments.ts
rename to backend/src/interfaces/assignment.ts
diff --git a/backend/src/interfaces/classes.ts b/backend/src/interfaces/class.ts
similarity index 100%
rename from backend/src/interfaces/classes.ts
rename to backend/src/interfaces/class.ts
diff --git a/backend/src/interfaces/groups.ts b/backend/src/interfaces/group.ts
similarity index 100%
rename from backend/src/interfaces/groups.ts
rename to backend/src/interfaces/group.ts
diff --git a/backend/src/interfaces/learningPath.ts b/backend/src/interfaces/learning-path.ts
similarity index 100%
rename from backend/src/interfaces/learningPath.ts
rename to backend/src/interfaces/learning-path.ts
diff --git a/backend/src/interfaces/question.ts b/backend/src/interfaces/question.ts
new file mode 100644
index 00000000..1a8c914a
--- /dev/null
+++ b/backend/src/interfaces/question.ts
@@ -0,0 +1,41 @@
+import {Question} from "../entities/questions/question.entity";
+import {Enum, PrimaryKey} from "@mikro-orm/core";
+import {Language} from "../entities/content/language";
+
+export interface QuestionDTO {
+    learningObjectHruid: string;
+    learningObjectLanguage: string;
+    learningObjectVersion: string;
+    sequenceNumber: number;
+    authorUsername: string;
+    timestamp: string;
+    content: string;
+    endpoints?: {
+        classes: string;
+        questions: string;
+        invitations: string;
+        groups: string;
+    };
+}
+
+/**
+ * Convert a Question entity to a DTO format.
+ */
+export function mapToQuestionDTO(question: Question): QuestionDTO {
+    return {
+        learningObjectHruid: question.learningObjectHruid,
+        learningObjectLanguage: question.learningObjectLanguage,
+        learningObjectVersion: question.learningObjectVersion,
+        sequenceNumber: question.sequenceNumber,
+        authorUsername: question.author.username,
+        timestamp: question.timestamp.toISOString(),
+        content: question.content,
+    };
+}
+
+export interface QuestionId {
+    learningObjectHruid: string,
+    learningObjectLanguage: Language,
+    learningObjectVersion: string,
+    sequenceNumber: number
+}
diff --git a/backend/src/interfaces/students.ts b/backend/src/interfaces/student.ts
similarity index 100%
rename from backend/src/interfaces/students.ts
rename to backend/src/interfaces/student.ts
diff --git a/backend/src/interfaces/teacher.ts b/backend/src/interfaces/teacher.ts
index 4f489c57..15c89520 100644
--- a/backend/src/interfaces/teacher.ts
+++ b/backend/src/interfaces/teacher.ts
@@ -1,23 +1,36 @@
 import { Teacher } from "../entities/users/teacher.entity.js";
 
+/**
+ * Teacher Data Transfer Object
+ */
 export interface TeacherDTO {
-    id: string;
     username: string;
     firstName: string;
     lastName: string;
     endpoints?: {
+        self: string;
         classes: string;
         questions: string;
         invitations: string;
-        groups: string;
     };
 }
 
+/**
+ * Maps a Teacher entity to a TeacherDTO
+ */
 export function mapToTeacherDTO(teacher: Teacher): TeacherDTO {
     return {
-        id: teacher.username,
         username: teacher.username,
         firstName: teacher.firstName,
         lastName: teacher.lastName,
     };
 }
+
+export function mapToTeacher(teacherData: TeacherDTO): Teacher {
+    const teacher = new Teacher();
+    teacher.username = teacherData.username;
+    teacher.firstName = teacherData.firstName;
+    teacher.lastName = teacherData.lastName;
+
+    return teacher;
+}
diff --git a/backend/src/routes/assignment.ts b/backend/src/routes/assignments.ts
similarity index 100%
rename from backend/src/routes/assignment.ts
rename to backend/src/routes/assignments.ts
diff --git a/backend/src/routes/class.ts b/backend/src/routes/classes.ts
similarity index 100%
rename from backend/src/routes/class.ts
rename to backend/src/routes/classes.ts
diff --git a/backend/src/routes/group.ts b/backend/src/routes/groups.ts
similarity index 100%
rename from backend/src/routes/group.ts
rename to backend/src/routes/groups.ts
diff --git a/backend/src/routes/learningObjects.ts b/backend/src/routes/learning-objects.ts
similarity index 94%
rename from backend/src/routes/learningObjects.ts
rename to backend/src/routes/learning-objects.ts
index 416602b5..3717095a 100644
--- a/backend/src/routes/learningObjects.ts
+++ b/backend/src/routes/learning-objects.ts
@@ -2,7 +2,7 @@ import express from 'express';
 import {
     getAllLearningObjects,
     getLearningObject,
-} from '../controllers/learningObjects.js';
+} from '../controllers/learning-objects.js';
 
 const router = express.Router();
 
diff --git a/backend/src/routes/learningPaths.ts b/backend/src/routes/learning-paths.ts
similarity index 91%
rename from backend/src/routes/learningPaths.ts
rename to backend/src/routes/learning-paths.ts
index ce580745..efe17312 100644
--- a/backend/src/routes/learningPaths.ts
+++ b/backend/src/routes/learning-paths.ts
@@ -1,5 +1,5 @@
 import express from 'express';
-import { getLearningPaths } from '../controllers/learningPaths.js';
+import { getLearningPaths } from '../controllers/learning-paths.js';
 
 const router = express.Router();
 
diff --git a/backend/src/routes/login.ts b/backend/src/routes/login.ts
deleted file mode 100644
index 550e6d93..00000000
--- a/backend/src/routes/login.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import express from 'express'
-const router = express.Router();
-
-// returns login paths for IDP
-router.get('/', (req, res) => {
-    res.json({
-        // dummy variables, needs to be changed
-        // with IDP endpoints
-        leerkracht: '/login-leerkracht',
-        leerling: '/login-leerling',
-    });
-})
-
-export default router
\ No newline at end of file
diff --git a/backend/src/routes/question.ts b/backend/src/routes/questions.ts
similarity index 100%
rename from backend/src/routes/question.ts
rename to backend/src/routes/questions.ts
diff --git a/backend/src/routes/student.ts b/backend/src/routes/students.ts
similarity index 100%
rename from backend/src/routes/student.ts
rename to backend/src/routes/students.ts
diff --git a/backend/src/routes/submission.ts b/backend/src/routes/submissions.ts
similarity index 100%
rename from backend/src/routes/submission.ts
rename to backend/src/routes/submissions.ts
diff --git a/backend/src/routes/teacher.ts b/backend/src/routes/teacher.ts
deleted file mode 100644
index 37b3b04b..00000000
--- a/backend/src/routes/teacher.ts
+++ /dev/null
@@ -1,58 +0,0 @@
-import express from 'express'
-const router = express.Router();
-
-// root endpoint used to search objects
-router.get('/', (req, res) => {
-    res.json({
-        teachers: [
-            '0',
-            '1',
-        ]
-    });
-});
-
-// information about a teacher
-router.get('/:id', (req, res) => {
-    res.json({
-        id: req.params.id,
-        firstName: 'John',
-        lastName: 'Doe',
-        username: 'JohnDoe1',
-        links: {
-            self: `${req.baseUrl}/${req.params.id}`,
-            classes: `${req.baseUrl}/${req.params.id}/classes`,
-            questions: `${req.baseUrl}/${req.params.id}/questions`,
-            invitations: `${req.baseUrl}/${req.params.id}/invitations`,
-        },
-    });
-})
-
-// the questions students asked a teacher
-router.get('/:id/questions', (req, res) => {
-    res.json({
-        questions: [
-            '0'
-        ],
-    });
-});
-
-// invitations to other classes a teacher received
-router.get('/:id/invitations', (req, res) => {
-    res.json({
-        invitations: [
-            '0'
-        ],
-    });
-});
-
-// a list with ids of classes a teacher is in
-router.get('/:id/classes', (req, res) => {
-    res.json({
-        classes: [
-            '0'
-        ],
-    });
-});
-
-
-export default router
\ No newline at end of file
diff --git a/backend/src/routes/teachers.ts b/backend/src/routes/teachers.ts
new file mode 100644
index 00000000..2a29897b
--- /dev/null
+++ b/backend/src/routes/teachers.ts
@@ -0,0 +1,34 @@
+import express from 'express'
+import {
+    createTeacherHandler,
+    deleteTeacherHandler,
+    getTeacherClassHandler,
+    getTeacherHandler, getTeacherQuestionHandler, getTeacherStudentHandler
+} from "../controllers/teachers.js";
+const router = express.Router();
+
+// root endpoint used to search objects
+router.get('/', getTeacherHandler);
+
+router.post('/', createTeacherHandler);
+
+router.delete('/:username', deleteTeacherHandler);
+
+router.get('/:username/classes', getTeacherClassHandler);
+
+router.get('/:username/students', getTeacherStudentHandler);
+
+router.get('/:username/questions', getTeacherQuestionHandler);
+
+// invitations to other classes a teacher received
+router.get('/:id/invitations', (req, res) => {
+    res.json({
+        invitations: [
+            '0'
+        ],
+    });
+});
+
+
+
+export default router
diff --git a/backend/src/services/class.ts b/backend/src/services/class.ts
index eaeb771d..3867d910 100644
--- a/backend/src/services/class.ts
+++ b/backend/src/services/class.ts
@@ -1,7 +1,7 @@
-import { getClassRepository, getTeacherInvitationRepository } from "../data/repositories.js";
-import { ClassDTO, mapToClassDTO } from "../interfaces/classes.js";
-import { mapToStudentDTO, StudentDTO } from "../interfaces/students.js";
-import { mapToTeacherInvitationDTO, mapToTeacherInvitationDTOIds, TeacherInvitationDTO } from "../interfaces/teacher-invitation.js";
+import { getClassRepository } from "../data/repositories";
+import { Class } from "../entities/classes/class.entity";
+import { ClassDTO, mapToClassDTO } from "../interfaces/class";
+import { mapToStudentDTO, StudentDTO } from "../interfaces/student";
 
 export async function getAllClasses(full: boolean): Promise<ClassDTO[] | string[]> {
     const classRepository = getClassRepository();
@@ -28,41 +28,21 @@ export async function getClass(classId: string): Promise<ClassDTO | null> {
     }
 }
 
-export async function getClassStudents(classId: string, full: boolean): Promise<StudentDTO[] | string[]> {
+async function fetchClassStudents(classId: string, full: boolean): Promise<StudentDTO[] | string[]> {
     const classRepository = getClassRepository();
     const cls = await classRepository.findById(classId);
 
-    if (!cls) {
+    if (!cls)
         return [];
-    }
 
-    if (full) {
-        return cls.students.map(mapToStudentDTO);
-    } else {
-        return cls.students.map((student) => student.username);
-    }
+    return cls.students.map(mapToStudentDTO);
 }
 
-export async function getClassTeacherInvitations(classId: string, full: boolean): Promise<TeacherInvitationDTO[]> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
-
-    if (!cls) {
-        return [];
-    }
-
-    const teacherInvitationRepository = getTeacherInvitationRepository();
-    const invitations = await teacherInvitationRepository.findAllInvitationsForClass(cls);
-
-    console.log(invitations);
-
-    if (!invitations) {
-        return [];
-    }
-
-    if (full) {
-        return invitations.map(mapToTeacherInvitationDTO);
-    }
-
-    return invitations.map(mapToTeacherInvitationDTOIds);
+export async function getClassStudents(classId: string): Promise<StudentDTO[]> {
+    return await fetchClassStudents(classId);
 }
+
+export async function getClassStudentsIds(classId: string): Promise<string[]> {
+    return await fetchClassStudents(classId).map((student) => student.username);
+}
+
diff --git a/backend/src/services/learningObjects.ts b/backend/src/services/learning-objects.ts
similarity index 96%
rename from backend/src/services/learningObjects.ts
rename to backend/src/services/learning-objects.ts
index d1d34ad2..65ad11a6 100644
--- a/backend/src/services/learningObjects.ts
+++ b/backend/src/services/learning-objects.ts
@@ -1,12 +1,12 @@
 import { DWENGO_API_BASE } from '../config.js';
-import { fetchWithLogging } from '../util/apiHelper.js';
+import { fetchWithLogging } from '../util/api-helper.js';
 import {
     FilteredLearningObject,
     LearningObjectMetadata,
     LearningObjectNode,
     LearningPathResponse,
-} from '../interfaces/learningPath.js';
-import { fetchLearningPaths } from './learningPaths.js';
+} from '../interfaces/learning-path.js';
+import { fetchLearningPaths } from './learning-paths.js';
 
 function filterData(
     data: LearningObjectMetadata,
diff --git a/backend/src/services/learningPaths.ts b/backend/src/services/learning-paths.ts
similarity index 93%
rename from backend/src/services/learningPaths.ts
rename to backend/src/services/learning-paths.ts
index 2a9f15a3..3353b58d 100644
--- a/backend/src/services/learningPaths.ts
+++ b/backend/src/services/learning-paths.ts
@@ -1,9 +1,9 @@
-import { fetchWithLogging } from '../util/apiHelper.js';
+import { fetchWithLogging } from '../util/api-helper.js';
 import { DWENGO_API_BASE } from '../config.js';
 import {
     LearningPath,
     LearningPathResponse,
-} from '../interfaces/learningPath.js';
+} from '../interfaces/learning-path.js';
 
 export async function fetchLearningPaths(
     hruids: string[],
diff --git a/backend/src/services/teachers.ts b/backend/src/services/teachers.ts
new file mode 100644
index 00000000..4b8affc5
--- /dev/null
+++ b/backend/src/services/teachers.ts
@@ -0,0 +1,131 @@
+import {
+    getClassRepository,
+    getLearningObjectRepository,
+    getQuestionRepository,
+    getTeacherRepository
+} from "../data/repositories.js";
+import {mapToTeacher, mapToTeacherDTO, TeacherDTO} from "../interfaces/teacher.js";
+import { Teacher } from "../entities/users/teacher.entity";
+import {ClassDTO, mapToClassDTO} from "../interfaces/class";
+import {getClassStudents, getClassStudentsIds} from "./class";
+import {StudentDTO} from "../interfaces/student";
+import {mapToQuestionDTO, QuestionDTO, QuestionId} from "../interfaces/question";
+
+
+async function fetchAllTeachers(): Promise<TeacherDTO[]> {
+    const teacherRepository = getTeacherRepository();
+    const teachers = await teacherRepository.find({});
+
+    return teachers.map(mapToTeacherDTO);
+}
+
+export async function getAllTeachers(): Promise<TeacherDTO[]> {
+    return await fetchAllTeachers();
+}
+
+export async function getAllTeachersIds(): Promise<string[]> {
+    return await fetchAllTeachers().map((teacher) => teacher.username)
+}
+
+export async function createTeacher(teacherData: TeacherDTO): Promise<Teacher> {
+    const teacherRepository = getTeacherRepository();
+    const newTeacher = mapToTeacher(teacherData);
+
+    await teacherRepository.addTeacher(newTeacher);
+    return newTeacher;
+}
+
+export async function getTeacherByUsername(username: string): Promise<TeacherDTO | null> {
+    const teacherRepository = getTeacherRepository();
+    const teacher = await teacherRepository.findByUsername(username);
+
+    return teacher ? mapToTeacherDTO(teacher) : null;
+}
+
+export async function deleteTeacher(username: string): Promise<TeacherDTO | null> {
+    const teacherRepository = getTeacherRepository();
+    const teacher = await teacherRepository.findByUsername(username);
+
+    if (!teacher)
+        return null;
+
+    await teacherRepository.deleteByUsername(username);
+    return teacher;
+}
+
+async function fetchClassesByTeacher(username: string): Promise<ClassDTO[]> {
+    const teacherRepository = getTeacherRepository();
+    const classRepository = getClassRepository();
+
+    const teacher = await teacherRepository.findByUsername(username);
+    if (!teacher) {
+        return [];
+    }
+
+    const classes = await classRepository.findByTeacher(teacher);
+    return classes.map(mapToClassDTO);
+}
+
+export async function getClassesByTeacher(username: string): Promise<ClassDTO[]> {
+    return await fetchClassesByTeacher(username)
+}
+
+export async function getClassIdsByTeacher(): Promise<string[]> {
+    return await fetchClassesByTeacher(username).map((cls) => cls.id);
+}
+
+async function fetchStudentsByTeacher(username: string) {
+    const classes = await getClassIdsByTeacher();
+
+    return Promise.all(
+        classes.map( async (id) => getClassStudents(id))
+    );
+}
+
+export async function getStudentsByTeacher(username: string): Promise<StudentDTO[]> {
+    return await fetchStudentsByTeacher(username);
+}
+
+export async function getStudentIdsByTeacher(): Promise<string[]> {
+    return await fetchStudentsByTeacher(username).map((student) => student.username);
+}
+
+async function fetchTeacherQuestions(username: string): Promise<QuestionDTO[]> {
+    const learningObjectRepository = getLearningObjectRepository();
+    const questionRepository = getQuestionRepository();
+
+    const teacher = getTeacherByUsername(username);
+    if (!teacher) {
+        throw new Error(`Teacher with username '${username}' not found.`);
+    }
+
+    // Find all learning objects that this teacher manages
+    const learningObjects = await learningObjectRepository.findAllByTeacher(teacher);
+
+    // Fetch all questions related to these learning objects
+    const questions = await questionRepository.findAllByLearningObjects(learningObjects);
+
+    return questions.map(mapToQuestionDTO);
+}
+
+export async function getQuestionsByTeacher(username: string): Promise<QuestionDTO[]> {
+    return await fetchTeacherQuestions(username);
+}
+
+export async function getQuestionIdsByTeacher(username: string): Promise<QuestionId[]> {
+    const questions = await fetchTeacherQuestions(username);
+
+    return questions.map((question) => ({
+        learningObjectHruid: question.learningObjectHruid,
+        learningObjectLanguage: question.learningObjectLanguage,
+        learningObjectVersion: question.learningObjectVersion,
+        sequenceNumber: question.sequenceNumber
+    }));
+}
+
+
+
+
+
+
+
diff --git a/backend/src/util/apiHelper.ts b/backend/src/util/api-helper.ts
similarity index 100%
rename from backend/src/util/apiHelper.ts
rename to backend/src/util/api-helper.ts
diff --git a/backend/src/util/translationHelper.ts b/backend/src/util/translation-helper.ts
similarity index 93%
rename from backend/src/util/translationHelper.ts
rename to backend/src/util/translation-helper.ts
index eb7141ee..d6d842ff 100644
--- a/backend/src/util/translationHelper.ts
+++ b/backend/src/util/translation-helper.ts
@@ -1,7 +1,7 @@
 import fs from 'fs';
 import path from 'path';
 import yaml from 'js-yaml';
-import {FALLBACK_LANG} from "../config.js";
+import { FALLBACK_LANG } from "../config.js";
 
 export function loadTranslations<T>(language: string): T {
     try {