diff --git a/backend/src/routes/groups.ts b/backend/src/routes/groups.ts
index dc8917bd..1486edce 100644
--- a/backend/src/routes/groups.ts
+++ b/backend/src/routes/groups.ts
@@ -11,7 +11,7 @@ router.post('/', createGroupHandler);
 // Information about a group (members, ... [TODO DOC])
 router.get('/:groupid', getGroupHandler);
 
-router.get('/:groupid', getGroupSubmissionsHandler);
+router.get('/:groupid/submissions', getGroupSubmissionsHandler);
 
 // The list of questions a group has made
 router.get('/:id/questions', (_req, res) => {
diff --git a/frontend/src/controllers/assignments.ts b/frontend/src/controllers/assignments.ts
index 5fd5090a..e255ad66 100644
--- a/frontend/src/controllers/assignments.ts
+++ b/frontend/src/controllers/assignments.ts
@@ -1,5 +1,47 @@
-import type { AssignmentDTO } from "@dwengo-1/interfaces/assignment";
+import { BaseController } from "./base-controller";
+import type { AssignmentDTO } from "@dwengo-1/common/interfaces/assignment";
+import type { SubmissionsResponse } from "./submissions";
+import type { QuestionsResponse } from "./questions";
+import type { GroupsResponse } from "./groups";
 
 export interface AssignmentsResponse {
-    assignments: AssignmentDTO[];
-} // TODO ID
+    assignments: AssignmentDTO[] | string[];
+}
+
+export interface AssignmentResponse {
+    assignment: AssignmentDTO;
+}
+
+export class AssignmentController extends BaseController {
+    constructor(classid: string) {
+        super(`class/${classid}/assignments`);
+    }
+
+    async getAll(full = true) {
+        return this.get<AssignmentsResponse>(`/`, { full });
+    }
+
+    async getByNumber(num: number) {
+        return this.get<AssignmentResponse>(`/${num}`);
+    }
+
+    async createAssignment(data: any) {
+        return this.post<AssignmentResponse>(`/`, data);
+    }
+
+    async deleteAssignment(num: number) {
+        return this.delete<AssignmentResponse>(`/${num}`);
+    }
+
+    async getSubmissions(assignmentNumber: number, full = true) {
+        return this.get<SubmissionsResponse>(`/${assignmentNumber}/submissions`, { full });
+    }
+
+    async getQuestions(assignmentNumber: number, full = true) {
+        return this.get<QuestionsResponse>(`/${assignmentNumber}/questions`, { full });
+    }
+
+    async getGroups(assignmentNumber: number, full = true) {
+        return this.get<GroupsResponse>(`/${assignmentNumber}/groups`, { full });
+    }
+}
diff --git a/frontend/src/controllers/classes.ts b/frontend/src/controllers/classes.ts
index d2d95ed5..374f0f6e 100644
--- a/frontend/src/controllers/classes.ts
+++ b/frontend/src/controllers/classes.ts
@@ -1,5 +1,47 @@
-import type { ClassDTO } from "@dwengo-1/interfaces/class";
+import { BaseController } from "./base-controller";
+import type { ClassDTO } from "@dwengo-1/common/interfaces/class";
+import type { StudentsResponse } from "./students";
+import type { AssignmentsResponse } from "./assignments";
 
 export interface ClassesResponse {
     classes: ClassDTO[] | string[];
 }
+
+export interface ClassResponse {
+    class: ClassDTO;
+}
+
+export class ClassController extends BaseController {
+    constructor() {
+        super("class");
+    }
+
+    async getAll(full = true) {
+        return this.get<ClassesResponse>(`/`, { full });
+    }
+
+    async getById(id: string) {
+        return this.get<ClassResponse>(`/${id}`);
+    }
+
+    async createClass(data: any) {
+        return this.post<ClassResponse>(`/`, data);
+    }
+
+    async deleteClass(id: string) {
+        return this.delete<ClassResponse>(`/${id}`);
+    }
+
+    async getStudents(id: string, full = true) {
+        return this.get<StudentsResponse>(`/${id}/students`, { full });
+    }
+
+    // TODO
+    async getTeacherInvitations(id: string, full = true) {
+        return this.get<any>(`/${id}/teacher-invitations`, { full });
+    }
+
+    async getAssignments(id: string, full = true) {
+        return this.get<AssignmentsResponse>(`/${id}/assignments`, { full });
+    }
+}
diff --git a/frontend/src/controllers/groups.ts b/frontend/src/controllers/groups.ts
index d6738e04..e82e5607 100644
--- a/frontend/src/controllers/groups.ts
+++ b/frontend/src/controllers/groups.ts
@@ -1,5 +1,42 @@
-import type { GroupDTO } from "@dwengo-1/interfaces/group";
+import { BaseController } from "./base-controller";
+import type { GroupDTO } from "@dwengo-1/common/interfaces/group";
+import type { SubmissionsResponse } from "./submissions";
+import type { QuestionsResponse } from "./questions";
 
 export interface GroupsResponse {
     groups: GroupDTO[];
-} // | TODO id
+}
+
+export interface GroupResponse {
+    group: GroupDTO;
+}
+
+export class GroupController extends BaseController {
+    constructor(classid: string, assignmentNumber: number) {
+        super(`class/${classid}/assignments/${assignmentNumber}/groups`);
+    }
+
+    async getAll(full = true) {
+        return this.get<GroupsResponse>(`/`, { full });
+    }
+
+    async getByNumber(num: number) {
+        return this.get<GroupResponse>(`/${num}`);
+    }
+
+    async createGroup(data: any) {
+        return this.post<GroupResponse>(`/`, data);
+    }
+
+    async deleteGroup(num: number) {
+        return this.delete<GroupResponse>(`/${num}`);
+    }
+
+    async getSubmissions(groupNumber: number, full = true) {
+        return this.get<SubmissionsResponse>(`/${groupNumber}/submissions`, { full });
+    }
+
+    async getQuestions(groupNumber: number, full = true) {
+        return this.get<QuestionsResponse>(`/${groupNumber}/questions`, { full });
+    }
+}
diff --git a/frontend/src/controllers/questions.ts b/frontend/src/controllers/questions.ts
index 9b0182de..16abd38b 100644
--- a/frontend/src/controllers/questions.ts
+++ b/frontend/src/controllers/questions.ts
@@ -1,4 +1,4 @@
-import type { QuestionDTO, QuestionId } from "@dwengo-1/interfaces/question";
+import type { QuestionDTO, QuestionId } from "@dwengo-1/common/interfaces/question";
 
 export interface QuestionsResponse {
     questions: QuestionDTO[] | QuestionId[];
diff --git a/frontend/src/controllers/students.ts b/frontend/src/controllers/students.ts
index b36f1d5a..f74f02da 100644
--- a/frontend/src/controllers/students.ts
+++ b/frontend/src/controllers/students.ts
@@ -4,8 +4,8 @@ import type { AssignmentsResponse } from "@/controllers/assignments.ts";
 import type { GroupsResponse } from "@/controllers/groups.ts";
 import type { SubmissionsResponse } from "@/controllers/submissions.ts";
 import type { QuestionsResponse } from "@/controllers/questions.ts";
-import type { StudentDTO } from "@dwengo-1/interfaces/student";
-import type { ClassJoinRequestDTO } from "@dwengo-1/interfaces/class-join-request";
+import type { StudentDTO } from "@dwengo-1/common/interfaces/student";
+import type { ClassJoinRequestDTO } from "@dwengo-1/common/interfaces/class-join-request";
 
 export interface StudentsResponse {
     students: StudentDTO[] | string[];
diff --git a/frontend/src/controllers/submissions.ts b/frontend/src/controllers/submissions.ts
index 99b6ba8d..72621fcf 100644
--- a/frontend/src/controllers/submissions.ts
+++ b/frontend/src/controllers/submissions.ts
@@ -1,5 +1,32 @@
-import { type SubmissionDTO, SubmissionDTOId } from "@dwengo-1/interfaces/submission";
+import { BaseController } from "./base-controller";
+import type { SubmissionDTO, SubmissionDTOId } from "@dwengo-1/common/interfaces/submission";
 
 export interface SubmissionsResponse {
     submissions: SubmissionDTO[] | SubmissionDTOId[];
 }
+
+export interface SubmissionResponse {
+    submission: SubmissionDTO;
+}
+
+export class SubmissionController extends BaseController {
+    constructor(classid: string, assignmentNumber: number, groupNumber: number) {
+        super(`class/${classid}/assignments/${assignmentNumber}/groups/${groupNumber}`);
+    }
+
+    async getAll(full = true) {
+        return this.get<SubmissionsResponse>(`/`, { full });
+    }
+
+    async getByNumber(submissionNumber: number) {
+        return this.get<SubmissionResponse>(`/${submissionNumber}`);
+    }
+
+    async createSubmission(data: any) {
+        return this.post<SubmissionResponse>(`/`, data);
+    }
+
+    async deleteSubmission(submissionNumber: number) {
+        return this.delete<SubmissionResponse>(`/${submissionNumber}`);
+    }
+}
diff --git a/frontend/src/controllers/teachers.ts b/frontend/src/controllers/teachers.ts
index e0d38a6c..973e2b02 100644
--- a/frontend/src/controllers/teachers.ts
+++ b/frontend/src/controllers/teachers.ts
@@ -2,7 +2,7 @@ import { BaseController } from "@/controllers/base-controller.ts";
 import type { JoinRequestResponse, JoinRequestsResponse, StudentsResponse } from "@/controllers/students.ts";
 import type { QuestionsResponse } from "@/controllers/questions.ts";
 import type { ClassesResponse } from "@/controllers/classes.ts";
-import type { TeacherDTO } from "@dwengo-1/interfaces/teacher";
+import type { TeacherDTO } from "@dwengo-1/common/interfaces/teacher";
 
 export interface TeachersResponse {
     teachers: TeacherDTO[] | string[];
diff --git a/frontend/src/controllers/themes.ts b/frontend/src/controllers/themes.ts
index bb76249d..ca173373 100644
--- a/frontend/src/controllers/themes.ts
+++ b/frontend/src/controllers/themes.ts
@@ -1,5 +1,5 @@
 import { BaseController } from "@/controllers/base-controller.ts";
-import type { Theme } from "@dwengo-1/interfaces/theme";
+import type { Theme } from "@dwengo-1/common/interfaces/theme";
 
 export class ThemeController extends BaseController {
     constructor() {