diff --git a/backend/src/db/seeds/1-user.ts b/backend/src/db/seeds/1-user.ts
index 8e2b00b90..5a5ff5404 100644
--- a/backend/src/db/seeds/1-user.ts
+++ b/backend/src/db/seeds/1-user.ts
@@ -9,7 +9,12 @@ export async function seed(knex: Knex): Promise<void> {
   await knex(TableName.Users).del();
   await knex(TableName.UserEncryptionKey).del();
   await knex(TableName.SuperAdmin).del();
-  await knex(TableName.SuperAdmin).insert([{ initialized: true, allowSignUp: true }]);
+
+  await knex(TableName.SuperAdmin).insert([
+    // eslint-disable-next-line
+    // @ts-ignore
+    { id: "00000000-0000-0000-0000-000000000000", initialized: true, allowSignUp: true }
+  ]);
   // Inserts seed entries
   const [user] = await knex(TableName.Users)
     .insert([
diff --git a/backend/src/server/routes/index.ts b/backend/src/server/routes/index.ts
index d3d01ccb5..7880f79e3 100644
--- a/backend/src/server/routes/index.ts
+++ b/backend/src/server/routes/index.ts
@@ -263,6 +263,8 @@ export const registerRoutes = async (
     incidentContactDAL,
     tokenService,
     projectDAL,
+    projectMembershipDAL,
+    projectKeyDAL,
     smtpService,
     userDAL,
     orgBotDAL
diff --git a/backend/src/services/org/org-service.ts b/backend/src/services/org/org-service.ts
index f39ac5366..28cf4b382 100644
--- a/backend/src/services/org/org-service.ts
+++ b/backend/src/services/org/org-service.ts
@@ -22,6 +22,8 @@ import { ActorType, AuthMethod, AuthTokenType } from "../auth/auth-type";
 import { TAuthTokenServiceFactory } from "../auth-token/auth-token-service";
 import { TokenType } from "../auth-token/auth-token-types";
 import { TProjectDALFactory } from "../project/project-dal";
+import { TProjectKeyDALFactory } from "../project-key/project-key-dal";
+import { TProjectMembershipDALFactory } from "../project-membership/project-membership-dal";
 import { SmtpTemplates, TSmtpService } from "../smtp/smtp-service";
 import { TUserDALFactory } from "../user/user-dal";
 import { TIncidentContactsDALFactory } from "./incident-contacts-dal";
@@ -44,6 +46,8 @@ type TOrgServiceFactoryDep = {
   orgRoleDAL: TOrgRoleDALFactory;
   userDAL: TUserDALFactory;
   projectDAL: TProjectDALFactory;
+  projectMembershipDAL: Pick<TProjectMembershipDALFactory, "findProjectMembershipsByUserId" | "delete">;
+  projectKeyDAL: Pick<TProjectKeyDALFactory, "find" | "delete">;
   incidentContactDAL: TIncidentContactsDALFactory;
   samlConfigDAL: Pick<TSamlConfigDALFactory, "findOne" | "findEnforceableSamlCfg">;
   smtpService: TSmtpService;
@@ -65,6 +69,8 @@ export const orgServiceFactory = ({
   permissionService,
   smtpService,
   projectDAL,
+  projectMembershipDAL,
+  projectKeyDAL,
   tokenService,
   orgBotDAL,
   licenseService,
@@ -503,10 +509,50 @@ export const orgServiceFactory = ({
     const { permission } = await permissionService.getUserOrgPermission(userId, orgId, actorOrgId);
     ForbiddenError.from(permission).throwUnlessCan(OrgPermissionActions.Delete, OrgPermissionSubjects.Member);
 
-    const membership = await orgDAL.deleteMembershipById(membershipId, orgId);
+    const deletedMembership = await orgDAL.transaction(async (tx) => {
+      const orgMembership = await orgDAL.deleteMembershipById(membershipId, orgId, tx);
 
-    await licenseService.updateSubscriptionOrgMemberCount(orgId);
-    return membership;
+      if (!orgMembership.userId) {
+        await licenseService.updateSubscriptionOrgMemberCount(orgId);
+        return orgMembership;
+      }
+
+      // Get all the project memberships of the user in the organization
+      const projectMemberships = await projectMembershipDAL.findProjectMembershipsByUserId(orgId, orgMembership.userId);
+
+      // Delete all the project memberships of the user in the organization
+      await projectMembershipDAL.delete(
+        {
+          $in: {
+            id: projectMemberships.map((membership) => membership.id)
+          }
+        },
+        tx
+      );
+
+      // Get all the project keys of the user in the organization
+      const projectKeys = await projectKeyDAL.find({
+        $in: {
+          projectId: projectMemberships.map((membership) => membership.projectId)
+        },
+        receiverId: orgMembership.userId
+      });
+
+      // Delete all the project keys of the user in the organization
+      await projectKeyDAL.delete(
+        {
+          $in: {
+            id: projectKeys.map((key) => key.id)
+          }
+        },
+        tx
+      );
+
+      await licenseService.updateSubscriptionOrgMemberCount(orgId);
+      return orgMembership;
+    });
+
+    return deletedMembership;
   };
 
   /*
diff --git a/backend/src/services/project-membership/project-membership-dal.ts b/backend/src/services/project-membership/project-membership-dal.ts
index e0002f911..77ed867c4 100644
--- a/backend/src/services/project-membership/project-membership-dal.ts
+++ b/backend/src/services/project-membership/project-membership-dal.ts
@@ -82,5 +82,25 @@ export const projectMembershipDALFactory = (db: TDbClient) => {
     }
   };
 
-  return { ...projectMemberOrm, findAllProjectMembers, findProjectGhostUser, findMembershipsByEmail };
+  const findProjectMembershipsByUserId = async (orgId: string, userId: string) => {
+    try {
+      const memberships = await db(TableName.ProjectMembership)
+        .where({ userId })
+        .join(TableName.Project, `${TableName.ProjectMembership}.projectId`, `${TableName.Project}.id`)
+        .where({ [`${TableName.Project}.orgId` as "orgId"]: orgId })
+        .select(selectAllTableCols(TableName.ProjectMembership));
+
+      return memberships;
+    } catch (error) {
+      throw new DatabaseError({ error, name: "Find project memberships by user id" });
+    }
+  };
+
+  return {
+    ...projectMemberOrm,
+    findAllProjectMembers,
+    findProjectGhostUser,
+    findMembershipsByEmail,
+    findProjectMembershipsByUserId
+  };
 };