diff --git a/backend/src/server/routes/index.ts b/backend/src/server/routes/index.ts
index 9ed38a7e3..3e5575daa 100644
--- a/backend/src/server/routes/index.ts
+++ b/backend/src/server/routes/index.ts
@@ -895,7 +895,8 @@ export const registerRoutes = async (
     certificateTemplateDAL,
     projectSlackConfigDAL,
     slackIntegrationDAL,
-    projectTemplateService
+    projectTemplateService,
+    groupProjectDAL
   });
 
   const projectEnvService = projectEnvServiceFactory({
diff --git a/backend/src/services/project/project-service.ts b/backend/src/services/project/project-service.ts
index b5046be63..e1653d371 100644
--- a/backend/src/services/project/project-service.ts
+++ b/backend/src/services/project/project-service.ts
@@ -29,6 +29,7 @@ import { ActorType } from "../auth/auth-type";
 import { TCertificateDALFactory } from "../certificate/certificate-dal";
 import { TCertificateAuthorityDALFactory } from "../certificate-authority/certificate-authority-dal";
 import { TCertificateTemplateDALFactory } from "../certificate-template/certificate-template-dal";
+import { TGroupProjectDALFactory } from "../group-project/group-project-dal";
 import { TIdentityOrgDALFactory } from "../identity/identity-org-dal";
 import { TIdentityProjectDALFactory } from "../identity-project/identity-project-dal";
 import { TIdentityProjectMembershipRoleDALFactory } from "../identity-project/identity-project-membership-role-dal";
@@ -100,7 +101,8 @@ type TProjectServiceFactoryDep = {
   identityProjectDAL: TIdentityProjectDALFactory;
   identityProjectMembershipRoleDAL: Pick<TIdentityProjectMembershipRoleDALFactory, "create">;
   projectKeyDAL: Pick<TProjectKeyDALFactory, "create" | "findLatestProjectKey" | "delete" | "find" | "insertMany">;
-  projectMembershipDAL: Pick<TProjectMembershipDALFactory, "create" | "findProjectGhostUser" | "findOne">;
+  projectMembershipDAL: Pick<TProjectMembershipDALFactory, "create" | "findProjectGhostUser" | "findOne" | "delete">;
+  groupProjectDAL: Pick<TGroupProjectDALFactory, "delete">;
   projectSlackConfigDAL: Pick<TProjectSlackConfigDALFactory, "findOne" | "transaction" | "updateById" | "create">;
   slackIntegrationDAL: Pick<TSlackIntegrationDALFactory, "findById" | "findByIdWithWorkflowIntegrationDetails">;
   projectUserMembershipRoleDAL: Pick<TProjectUserMembershipRoleDALFactory, "create">;
@@ -120,7 +122,7 @@ type TProjectServiceFactoryDep = {
   orgDAL: Pick<TOrgDALFactory, "findOne">;
   keyStore: Pick<TKeyStoreFactory, "deleteItem">;
   projectBotDAL: Pick<TProjectBotDALFactory, "create">;
-  projectRoleDAL: Pick<TProjectRoleDALFactory, "find" | "insertMany">;
+  projectRoleDAL: Pick<TProjectRoleDALFactory, "find" | "insertMany" | "delete">;
   kmsService: Pick<
     TKmsServiceFactory,
     | "updateProjectSecretManagerKmsKey"
@@ -169,7 +171,8 @@ export const projectServiceFactory = ({
   projectBotDAL,
   projectSlackConfigDAL,
   slackIntegrationDAL,
-  projectTemplateService
+  projectTemplateService,
+  groupProjectDAL
 }: TProjectServiceFactoryDep) => {
   /*
    * Create workspace. Make user the admin
@@ -444,13 +447,32 @@ export const projectServiceFactory = ({
     ForbiddenError.from(permission).throwUnlessCan(ProjectPermissionActions.Delete, ProjectPermissionSub.Project);
 
     const deletedProject = await projectDAL.transaction(async (tx) => {
+      // delete these so that project custom roles can be deleted in cascade effect
+      // direct deletion of project without these will cause fk error
+      await projectMembershipDAL.delete({ projectId: project.id }, tx);
+      await groupProjectDAL.delete({ projectId: project.id }, tx);
       const delProject = await projectDAL.deleteById(project.id, tx);
       const projectGhostUser = await projectMembershipDAL.findProjectGhostUser(project.id, tx).catch(() => null);
+      // akhilmhdh: before removing those kms checking any other project uses it
+      // happened due to project split
       if (delProject.kmsCertificateKeyId) {
-        await kmsService.deleteInternalKms(delProject.kmsCertificateKeyId, delProject.orgId, tx);
+        const projectsLinkedToForiegnKey = await projectDAL.find(
+          { kmsCertificateKeyId: delProject.kmsCertificateKeyId },
+          { tx }
+        );
+        if (!projectsLinkedToForiegnKey.length) {
+          await kmsService.deleteInternalKms(delProject.kmsCertificateKeyId, delProject.orgId, tx);
+        }
       }
+
       if (delProject.kmsSecretManagerKeyId) {
-        await kmsService.deleteInternalKms(delProject.kmsSecretManagerKeyId, delProject.orgId, tx);
+        const projectsLinkedToForiegnKey = await projectDAL.find(
+          { kmsSecretManagerKeyId: delProject.kmsSecretManagerKeyId },
+          { tx }
+        );
+        if (!projectsLinkedToForiegnKey.length) {
+          await kmsService.deleteInternalKms(delProject.kmsSecretManagerKeyId, delProject.orgId, tx);
+        }
       }
       // Delete the org membership for the ghost user if it's found.
       if (projectGhostUser) {