diff --git a/backend/src/services/notifications/list.js b/backend/src/services/notifications/list.js
index 29b198d..e9ce120 100644
--- a/backend/src/services/notifications/list.js
+++ b/backend/src/services/notifications/list.js
@@ -34,6 +34,7 @@ const errors = {
       revokingOwnPermission: `You can't revoke your own owner permission`,
       deletingHimself: `You can't delete yourself`,
       emailRequired: 'Email is required',
+      slugAlreadyExists: 'This slug is already in use by another project',
     },
   },
 
diff --git a/backend/src/services/projects.js b/backend/src/services/projects.js
index c800c4b..5abbcf8 100644
--- a/backend/src/services/projects.js
+++ b/backend/src/services/projects.js
@@ -43,9 +43,47 @@ module.exports = class ProjectsService {
     return uniqueSlug;
   }
 
+  /**
+   * Validate slug uniqueness before create/update
+   * @param {string} slug - Slug to validate
+   * @param {string|null} excludeId - Project ID to exclude (for updates)
+   * @param {Transaction} transaction - DB transaction
+   * @throws {ValidationError} if slug already exists
+   * @returns {string} Normalized slug
+   */
+  static async validateSlugUniqueness(slug, excludeId, transaction) {
+    const normalizedSlug = ProjectsService.normalizeSlug(slug);
+
+    const whereClause = { slug: normalizedSlug };
+    if (excludeId) {
+      whereClause.id = { [db.Sequelize.Op.ne]: excludeId };
+    }
+
+    const existing = await db.projects.findOne({
+      where: whereClause,
+      paranoid: false,
+      transaction,
+    });
+
+    if (existing) {
+      throw new ValidationError('iam.errors.slugAlreadyExists');
+    }
+
+    return normalizedSlug;
+  }
+
   static async create(data, currentUser) {
     const transaction = await db.sequelize.transaction();
     try {
+      // Validate slug uniqueness if provided
+      if (data.slug) {
+        data.slug = await ProjectsService.validateSlugUniqueness(
+          data.slug,
+          null,
+          transaction,
+        );
+      }
+
       const createdProject = await ProjectsDBApi.create(data, {
         currentUser,
         transaction,
@@ -196,6 +234,15 @@ module.exports = class ProjectsService {
         throw new ValidationError('projectsNotFound');
       }
 
+      // Validate slug uniqueness if slug is being changed
+      if (data.slug && data.slug !== projects.slug) {
+        data.slug = await ProjectsService.validateSlugUniqueness(
+          data.slug,
+          id,
+          transaction,
+        );
+      }
+
       const updatedProjects = await ProjectsDBApi.update(id, data, {
         currentUser,
         transaction,
diff --git a/frontend/src/pages/projects/projects-edit.tsx b/frontend/src/pages/projects/projects-edit.tsx
index 25ac2db..b287603 100644
--- a/frontend/src/pages/projects/projects-edit.tsx
+++ b/frontend/src/pages/projects/projects-edit.tsx
@@ -24,6 +24,7 @@ import BaseButton from '../../components/BaseButton';
 import { deleteItem, update, fetch } from '../../stores/projects/projectsSlice';
 import { useAppDispatch, useAppSelector } from '../../stores/hooks';
 import { useRouter } from 'next/router';
+import { toast, ToastContainer } from 'react-toastify';
 import type { Project } from '../../types/entities';
 import { logger } from '../../lib/logger';
 
@@ -143,8 +144,22 @@ const EditProjectsPage = () => {
       og_image_url: data.og_image_url,
     };
 
-    await dispatch(update({ id: id as string, data: apiData }));
-    await router.push('/projects/projects-list');
+    try {
+      await dispatch(update({ id: id as string, data: apiData })).unwrap();
+      toast('Project settings saved', {
+        type: 'success',
+        position: 'bottom-center',
+      });
+    } catch (error: unknown) {
+      const errorMessage =
+        error && typeof error === 'object' && 'message' in error
+          ? String((error as { message: string }).message)
+          : 'Failed to save project settings';
+      toast(errorMessage, {
+        type: 'error',
+        position: 'bottom-center',
+      });
+    }
   };
 
   const handleDelete = async () => {
@@ -322,6 +337,7 @@ const EditProjectsPage = () => {
             )}
           </Formik>
         </CardBox>
+        <ToastContainer />
       </SectionMain>
     </>
   );