diff --git a/backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/category/repository/CategoryRepository.java b/backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/category/repository/CategoryRepository.java
index e842783..bd152b0 100644
--- a/backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/category/repository/CategoryRepository.java
+++ b/backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/category/repository/CategoryRepository.java
@@ -1,5 +1,6 @@
 package org.codiki.infrastructure.category.repository;
 
+import java.util.List;
 import java.util.UUID;
 
 import org.codiki.infrastructure.category.model.CategoryEntity;
@@ -16,4 +17,7 @@ public interface CategoryRepository extends JpaRepository<CategoryEntity, UUID>
         ) > 0
         """, nativeQuery = true)
     boolean existsAnyAssociatedPublication(@Param("categoryId") UUID categoryId);
+
+    @Query("SELECT c FROM CategoryEntity c JOIN FETCH c.subCategories")
+    List<CategoryEntity> findAll();
 }
diff --git a/frontend/src/app/components/side-menu/side-menu.component.html b/frontend/src/app/components/side-menu/side-menu.component.html
new file mode 100644
index 0000000..464a407
--- /dev/null
+++ b/frontend/src/app/components/side-menu/side-menu.component.html
@@ -0,0 +1,15 @@
+<h1>Codiki</h1>
+<h2>Catégories</h2>
+<div class="categories-container">
+    <div class="category {{category.isOpenned ? 'openned' : ''}}" *ngFor="let category of categories$ | async">
+        <div id="category-{{category.id}}" class="category-header" (click)="setOpenned(category)">
+            {{category.name}}
+            <mat-icon>chevron_right</mat-icon>
+        </div>
+        <div class="sub-category-container {{category.isOpenned ? 'displayed' : ''}}">
+            <div class="sub-category" *ngFor="let subCategory of category.subCategories">
+                {{subCategory.name}}
+            </div>
+        </div>
+    </div>
+</div>
diff --git a/frontend/src/app/components/side-menu/side-menu.component.scss b/frontend/src/app/components/side-menu/side-menu.component.scss
new file mode 100644
index 0000000..e713008
--- /dev/null
+++ b/frontend/src/app/components/side-menu/side-menu.component.scss
@@ -0,0 +1,52 @@
+:host {
+    display: flex;
+    flex-direction: column;
+
+    .categories-container {
+        display: flex;
+        flex-direction: column;
+
+        .category {
+            border: 1px solid blue;
+
+            &:hover {
+                cursor: pointer;
+            }
+
+            .category-header {
+                display: flex;
+                flex-direction: row;
+                justify-content: space-between;
+                align-items: center;
+                padding: .5em 1em;
+
+                mat-icon {
+                    transition: transform .2s ease-in-out;
+                }
+            }
+
+            &.openned {
+                .category-header {
+                    mat-icon {
+                        transform: rotate(90deg);
+                    }
+                }
+
+                .sub-category-container {
+                    max-height: none;
+                }
+            }
+
+            .sub-category-container {
+                border: 1px solid red;
+                overflow: hidden;
+                max-height: 0;
+                transition: max-height .2s ease-in-out;
+    
+                .sub-category {
+                    padding: .5em 1em .5em 2em;
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/frontend/src/app/components/side-menu/side-menu.component.ts b/frontend/src/app/components/side-menu/side-menu.component.ts
new file mode 100644
index 0000000..fb283c1
--- /dev/null
+++ b/frontend/src/app/components/side-menu/side-menu.component.ts
@@ -0,0 +1,51 @@
+import { CommonModule } from '@angular/common';
+import { Component, inject } from '@angular/core';
+import { MatIconModule } from '@angular/material/icon';
+import { DisplayableCategory, SideMenuService } from './side-menu.service';
+import { Observable } from 'rxjs';
+
+@Component({
+  selector: 'app-side-menu',
+  standalone: true,
+  imports: [CommonModule, MatIconModule],
+  templateUrl: './side-menu.component.html',
+  styleUrl: './side-menu.component.scss'
+})
+export class SideMenuComponent {
+  private sideMenuService = inject(SideMenuService);
+
+  get categories$(): Observable<DisplayableCategory[]> {
+    return this.sideMenuService.categories$;
+  }
+
+  setOpenned(category: DisplayableCategory): void {
+    if (category.isOpenned) {
+      const categoryDiv = document.getElementById(`category-${category.id}`);
+      if (categoryDiv) {
+        this.closeAccordion(categoryDiv);
+      }
+    } else {
+      const categoriesDivs = document.getElementsByClassName('category-header');
+      Array.from(categoriesDivs)
+        .map(category => category as HTMLElement)  
+        .forEach(categoryDiv => this.closeAccordion(categoryDiv));
+      
+        const categoryDiv = document.getElementById(`category-${category.id}`);
+      if (categoryDiv) {
+        this.openAccordion(categoryDiv);
+      }
+    }
+
+    this.sideMenuService.setOpenned(category);
+  }
+
+  private closeAccordion(categoryDiv: HTMLElement): void {
+    const divContent = categoryDiv?.nextElementSibling as HTMLElement;
+    divContent.style.maxHeight = '0';
+  }
+
+  private openAccordion(categoryDiv: HTMLElement): void {
+    const divContent = categoryDiv?.nextElementSibling as HTMLElement;
+    divContent.style.maxHeight = `${divContent.scrollHeight}px`;
+  }
+}
diff --git a/frontend/src/app/components/side-menu/side-menu.service.ts b/frontend/src/app/components/side-menu/side-menu.service.ts
new file mode 100644
index 0000000..bf4ce5b
--- /dev/null
+++ b/frontend/src/app/components/side-menu/side-menu.service.ts
@@ -0,0 +1,86 @@
+import { Injectable, OnDestroy, inject } from '@angular/core';
+import { CategoryService } from '../../core/service/category.service';
+import { BehaviorSubject, Observable, Subscription, map } from 'rxjs';
+import { Category } from '../../core/rest-services/category/model/category';
+
+export interface DisplayableCategory {
+  id: string;
+  name: string;
+  subCategories: DisplayableSubCategory[];
+  isOpenned: boolean;
+}
+
+export interface DisplayableSubCategory {
+  id: string;
+  name: string;
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class SideMenuService implements OnDestroy {
+  private categoryService = inject(CategoryService);
+  private categoriesSubject = new BehaviorSubject<DisplayableCategory[]>([]);
+  private categoriesSubscription: Subscription | undefined;
+
+  constructor() {
+    this.categoriesSubscription = this.categoryService.categories$
+      .pipe(
+        map(categories =>
+          categories
+            .filter(category => category.subCategories?.length)
+            .map(category => 
+              this.mapToDisplayableCategory(category)
+            )
+        )
+      )
+      .subscribe(categories => this.categoriesSubject.next(categories));
+  }
+
+  ngOnDestroy(): void {
+    this.categoriesSubscription?.unsubscribe();
+  }
+
+  private mapToDisplayableCategory(category: Category): DisplayableCategory {
+    return {
+      id: category.id,
+      name: category.name,
+      subCategories: category.subCategories.map(subCategory => this.mapToDisplayableSubCategory(subCategory)),
+      isOpenned: false
+    };
+  }
+
+  private mapToDisplayableSubCategory(subCategory: Category): DisplayableSubCategory {
+    return {
+      id: subCategory.id,
+      name: subCategory.name
+    }
+  }
+
+  get categories$(): Observable<DisplayableCategory[]> {
+    return this.categoriesSubject.asObservable();
+  }
+
+  private get categories(): DisplayableCategory[] {
+    return this.categoriesSubject.value;
+  }
+
+  private save(categories: DisplayableCategory[]): void {
+    this.categoriesSubject.next(categories);
+  }
+
+  setOpenned(category: DisplayableCategory): void {
+    const categories = this.categories;
+    const matchingCategory = categories.find(categoryTemp => categoryTemp.id === category.id);
+    if (matchingCategory) {
+      const actualOpennedCategory = categories.find(category => category.isOpenned);
+      if (actualOpennedCategory && actualOpennedCategory.id === matchingCategory.id) {
+        matchingCategory.isOpenned = false;
+      } else {
+        categories.forEach(categoryTemp => categoryTemp.isOpenned = false);
+        matchingCategory.isOpenned = true;
+      }
+      this.save(categories);
+    }
+  }
+}
diff --git a/frontend/src/app/core/rest-services/category/category.rest-service.ts b/frontend/src/app/core/rest-services/category/category.rest-service.ts
new file mode 100644
index 0000000..9ad8e7b
--- /dev/null
+++ b/frontend/src/app/core/rest-services/category/category.rest-service.ts
@@ -0,0 +1,15 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable, inject } from '@angular/core';
+import { lastValueFrom } from 'rxjs';
+import { Category } from './model/category';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class CategoryRestService {
+  private httpClient = inject(HttpClient);
+
+  getCategories(): Promise<Category[]> {
+    return lastValueFrom(this.httpClient.get<Category[]>('/api/categories'));
+  }
+}
diff --git a/frontend/src/app/core/rest-services/category/model/category.ts b/frontend/src/app/core/rest-services/category/model/category.ts
new file mode 100644
index 0000000..e7e0a43
--- /dev/null
+++ b/frontend/src/app/core/rest-services/category/model/category.ts
@@ -0,0 +1,5 @@
+export interface Category {
+    id: string;
+    name: string;
+    subCategories: Category[];
+}
\ No newline at end of file
diff --git a/frontend/src/app/core/rest-services/model/login.model.ts b/frontend/src/app/core/rest-services/user/model/login.model.ts
similarity index 100%
rename from frontend/src/app/core/rest-services/model/login.model.ts
rename to frontend/src/app/core/rest-services/user/model/login.model.ts
diff --git a/frontend/src/app/core/rest-services/user.rest-service.ts b/frontend/src/app/core/rest-services/user/user.rest-service.ts
similarity index 100%
rename from frontend/src/app/core/rest-services/user.rest-service.ts
rename to frontend/src/app/core/rest-services/user/user.rest-service.ts
diff --git a/frontend/src/app/core/service/category.service.ts b/frontend/src/app/core/service/category.service.ts
new file mode 100644
index 0000000..1ba3429
--- /dev/null
+++ b/frontend/src/app/core/service/category.service.ts
@@ -0,0 +1,25 @@
+import { Injectable, inject } from '@angular/core';
+import { CategoryRestService } from '../rest-services/category/category.rest-service';
+import { BehaviorSubject, Observable } from 'rxjs';
+import { Category } from '../rest-services/category/model/category';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class CategoryService {
+  private categoryRestService = inject(CategoryRestService);
+  private categoriesSubject = new BehaviorSubject<Category[]>([]);
+
+  private get categories(): Category[] {
+    return this.categoriesSubject.value;
+  }
+
+  get categories$(): Observable<Category[]> {
+    if (!this.categories?.length) {
+      this.categoryRestService.getCategories()
+      .then(categories => this.categoriesSubject.next(categories))
+      .catch(error => console.error('An error occured while loading categories.', error));
+    }
+    return this.categoriesSubject.asObservable();
+  }
+}
diff --git a/frontend/src/app/pages/home/home.component.html b/frontend/src/app/pages/home/home.component.html
index 26e0443..cdaa426 100644
--- a/frontend/src/app/pages/home/home.component.html
+++ b/frontend/src/app/pages/home/home.component.html
@@ -1 +1,2 @@
 <h1>Welcome to Codiki application!</h1>
+<app-side-menu></app-side-menu>
\ No newline at end of file
diff --git a/frontend/src/app/pages/home/home.component.ts b/frontend/src/app/pages/home/home.component.ts
index deb69c4..46417d8 100644
--- a/frontend/src/app/pages/home/home.component.ts
+++ b/frontend/src/app/pages/home/home.component.ts
@@ -1,9 +1,10 @@
 import { Component } from '@angular/core';
+import { SideMenuComponent } from '../../components/side-menu/side-menu.component';
 
 @Component({
   selector: 'app-home',
   standalone: true,
-  imports: [],
+  imports: [SideMenuComponent],
   templateUrl: './home.component.html',
   styleUrl: './home.component.scss'
 })
diff --git a/frontend/src/app/pages/login/login.service.ts b/frontend/src/app/pages/login/login.service.ts
index 84fd89f..209f90a 100644
--- a/frontend/src/app/pages/login/login.service.ts
+++ b/frontend/src/app/pages/login/login.service.ts
@@ -2,8 +2,8 @@ import { Injectable, inject } from '@angular/core';
 import { BehaviorSubject, Observable } from 'rxjs';
 import { copy } from '../../core/utils/ObjectUtils';
 import { FormError } from '../../core/model/FormError';
-import { UserRestService } from '../../core/rest-services/user.rest-service';
-import { LoginRequest } from '../../core/rest-services/model/login.model';
+import { UserRestService } from '../../core/rest-services/user/user.rest-service';
+import { LoginRequest } from '../../core/rest-services/user/model/login.model';
 import { AuthenticationService } from '../../core/service/authentication.service';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import { Router } from '@angular/router';