diff --git a/backend/src/controllers/assignments.ts b/backend/src/controllers/assignments.ts
index 16dbb310..e2978363 100644
--- a/backend/src/controllers/assignments.ts
+++ b/backend/src/controllers/assignments.ts
@@ -1,6 +1,7 @@
 import { Request, Response } from 'express';
 import { createAssignment, getAllAssignments, getAssignment, getAssignmentsSubmissions } from '../services/assignments.js';
-import { AssignmentDTO } from '../interfaces/assignment.js';
+
+import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
 
 // Typescript is annoy with with parameter forwarding from class.ts
 interface AssignmentParams {
diff --git a/backend/src/interfaces/assignment.ts b/backend/src/interfaces/assignment.ts
index eefa8c96..c437f155 100644
--- a/backend/src/interfaces/assignment.ts
+++ b/backend/src/interfaces/assignment.ts
@@ -2,17 +2,7 @@ import { FALLBACK_LANG } from '../config.js';
 import { Assignment } from '../entities/assignments/assignment.entity.js';
 import { Class } from '../entities/classes/class.entity.js';
 import { languageMap } from '../entities/content/language.js';
-import { GroupDTO } from './group.js';
-
-export interface AssignmentDTO {
-    id: number;
-    class: string; // Id of class 'within'
-    title: string;
-    description: string;
-    learningPath: string;
-    language: string;
-    groups?: GroupDTO[] | string[]; // TODO
-}
+import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
 
 export function mapToAssignmentDTOId(assignment: Assignment): AssignmentDTO {
     return {
diff --git a/backend/src/interfaces/group.ts b/backend/src/interfaces/group.ts
index a25c5b8e..93701dce 100644
--- a/backend/src/interfaces/group.ts
+++ b/backend/src/interfaces/group.ts
@@ -1,6 +1,7 @@
 import { Group } from '../entities/assignments/group.entity.js';
-import { AssignmentDTO, mapToAssignmentDTO } from './assignment.js';
+import { mapToAssignmentDTO } from './assignment.js';
 import { mapToStudentDTO, StudentDTO } from './student.js';
+import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
 
 export interface GroupDTO {
     assignment: number | AssignmentDTO;
diff --git a/backend/src/services/assignments.ts b/backend/src/services/assignments.ts
index a21a96fa..0d8807c5 100644
--- a/backend/src/services/assignments.ts
+++ b/backend/src/services/assignments.ts
@@ -1,6 +1,7 @@
 import { getAssignmentRepository, getClassRepository, getGroupRepository, getSubmissionRepository } from '../data/repositories.js';
-import { AssignmentDTO, mapToAssignment, mapToAssignmentDTO, mapToAssignmentDTOId } from '../interfaces/assignment.js';
+import { mapToAssignment, mapToAssignmentDTO, mapToAssignmentDTOId } from '../interfaces/assignment.js';
 import { mapToSubmissionDTO, mapToSubmissionDTOId, SubmissionDTO, SubmissionDTOId } from '../interfaces/submission.js';
+import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
 
 export async function getAllAssignments(classid: string, full: boolean): Promise<AssignmentDTO[]> {
     const classRepository = getClassRepository();
diff --git a/backend/src/services/students.ts b/backend/src/services/students.ts
index 66327b6d..5382a67c 100644
--- a/backend/src/services/students.ts
+++ b/backend/src/services/students.ts
@@ -1,10 +1,10 @@
 import { getClassRepository, getGroupRepository, getStudentRepository, getSubmissionRepository } from '../data/repositories.js';
-import { AssignmentDTO } from '../interfaces/assignment.js';
 import { ClassDTO, mapToClassDTO } from '../interfaces/class.js';
 import { GroupDTO, mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
 import { mapToStudent, mapToStudentDTO, StudentDTO } from '../interfaces/student.js';
 import { mapToSubmissionDTO, mapToSubmissionDTOId, SubmissionDTO, SubmissionDTOId } from '../interfaces/submission.js';
 import { getAllAssignments } from './assignments.js';
+import { AssignmentDTO } from 'dwengo-1-common/src/interfaces/assignment';
 
 export async function getAllStudents(full: boolean): Promise<StudentDTO[] | string[]> {
     const studentRepository = getStudentRepository();
diff --git a/common/src/interfaces/answer.d.ts b/common/src/interfaces/answer.d.ts
index 96ed063b..88cc07be 100644
--- a/common/src/interfaces/answer.d.ts
+++ b/common/src/interfaces/answer.d.ts
@@ -1,5 +1,5 @@
-import { UserDTO } from 'dwengo-1-backend/src/interfaces/user.js'
-import { QuestionDTO } from 'dwengo-1-backend/src/interfaces/question.js'
+import { UserDTO } from 'dwengo-1-backend/src/interfaces/user.js';
+import { QuestionDTO } from 'dwengo-1-backend/src/interfaces/question.js';
 
 export interface AnswerDTO {
     author: UserDTO;
diff --git a/common/src/interfaces/assignment.d.ts b/common/src/interfaces/assignment.d.ts
new file mode 100644
index 00000000..88bf10c6
--- /dev/null
+++ b/common/src/interfaces/assignment.d.ts
@@ -0,0 +1,11 @@
+import { GroupDTO } from 'dwengo-1-backend/src/interfaces/group.js';
+
+export interface AssignmentDTO {
+    id: number;
+    class: string; // Id of class 'within'
+    title: string;
+    description: string;
+    learningPath: string;
+    language: string;
+    groups?: GroupDTO[] | string[]; // TODO
+}