diff --git a/backend/src/server/routes/v1/invite-org-router.ts b/backend/src/server/routes/v1/invite-org-router.ts
index 58713b4d5..9991f6032 100644
--- a/backend/src/server/routes/v1/invite-org-router.ts
+++ b/backend/src/server/routes/v1/invite-org-router.ts
@@ -21,7 +21,7 @@ export const registerInviteOrgRouter = async (server: FastifyZodProvider) => {
         projects: z
           .object({
             id: z.string(),
-            projectRoleSlug: z.string().default(ProjectMembershipRole.Member)
+            projectRoleSlug: z.string().array().default([ProjectMembershipRole.Member])
           })
           .array()
           .optional(),
diff --git a/backend/src/server/routes/v2/project-membership-router.ts b/backend/src/server/routes/v2/project-membership-router.ts
index 625deacf9..6ab574d64 100644
--- a/backend/src/server/routes/v2/project-membership-router.ts
+++ b/backend/src/server/routes/v2/project-membership-router.ts
@@ -48,7 +48,7 @@ export const registerProjectMembershipRouter = async (server: FastifyZodProvider
         projects: [
           {
             id: req.params.projectId,
-            projectRoleSlug: ProjectMembershipRole.Member
+            projectRoleSlug: [ProjectMembershipRole.Member]
           }
         ]
       });
diff --git a/backend/src/services/org/org-service.ts b/backend/src/services/org/org-service.ts
index f81719fac..9dad7086e 100644
--- a/backend/src/services/org/org-service.ts
+++ b/backend/src/services/org/org-service.ts
@@ -12,6 +12,7 @@ import {
   SecretKeyEncoding,
   TableName,
   TProjectMemberships,
+  TProjectUserMembershipRolesInsert,
   TUsers
 } from "@app/db/schemas";
 import { TProjects } from "@app/db/schemas/projects";
@@ -88,7 +89,7 @@ type TOrgServiceFactoryDep = {
     "getPlan" | "updateSubscriptionOrgMemberCount" | "generateOrgCustomerId" | "removeOrgCustomer"
   >;
   projectUserAdditionalPrivilegeDAL: Pick<TProjectUserAdditionalPrivilegeDALFactory, "delete">;
-  projectRoleDAL: Pick<TProjectRoleDALFactory, "findOne">;
+  projectRoleDAL: Pick<TProjectRoleDALFactory, "find">;
   userGroupMembershipDAL: Pick<TUserGroupMembershipDALFactory, "findUserGroupMembershipsInProject">;
   projectBotDAL: Pick<TProjectBotDALFactory, "findOne">;
   projectUserMembershipRoleDAL: Pick<TProjectUserMembershipRoleDALFactory, "insertMany">;
@@ -652,12 +653,15 @@ export const orgServiceFactory = ({
         if (!userWithEncryptionKeyInvitedToProject.length) continue;
 
         // validate custom project role
-        const invitedProjectRole =
-          invitedProjects.find((el) => el.id === project.id)?.projectRoleSlug || ProjectMembershipRole.Member;
-        const isCustomProjectRole = !Object.values(ProjectMembershipRole).includes(
-          invitedProjectRole as ProjectMembershipRole
+        const invitedProjectRoles = invitedProjects.find((el) => el.id === project.id)?.projectRoleSlug || [
+          ProjectMembershipRole.Member
+        ];
+
+        const customProjectRoles = invitedProjectRoles.filter(
+          (role) => !Object.values(ProjectMembershipRole).includes(role as ProjectMembershipRole)
         );
-        if (isCustomProjectRole) {
+        const hasCustomRole = Boolean(customProjectRoles.length);
+        if (hasCustomRole) {
           if (!plan?.rbac)
             throw new BadRequestError({
               message:
@@ -665,6 +669,17 @@ export const orgServiceFactory = ({
             });
         }
 
+        const customRoles = hasCustomRole
+          ? await projectRoleDAL.find({
+              projectId,
+              $in: { slug: customProjectRoles.map((role) => role) }
+            })
+          : [];
+        if (customRoles.length !== customProjectRoles.length)
+          throw new BadRequestError({ message: "Custom role not found" });
+
+        const customRolesGroupBySlug = groupBy(customRoles, ({ slug }) => slug);
+
         const ghostUser = await projectDAL.findProjectGhostUser(projectId, tx);
         if (!ghostUser) {
           throw new BadRequestError({
@@ -698,7 +713,7 @@ export const orgServiceFactory = ({
           userPrivateKey: botPrivateKey,
           members: userWithEncryptionKeyInvitedToProject.map((userEnc) => ({
             orgMembershipId: userEnc.userId,
-            projectMembershipRole: invitedProjectRole as ProjectMembershipRole,
+            projectMembershipRole: ProjectMembershipRole.Admin,
             userPublicKey: userEnc.publicKey
           }))
         });
@@ -712,17 +727,18 @@ export const orgServiceFactory = ({
         );
         newProjectMemberships.push(...projectMemberships);
 
-        let customRoleId: string;
-        const projectRole = isCustomProjectRole ? ProjectMembershipRole.Custom : invitedProjectRole;
-        if (isCustomProjectRole) {
-          const customRole = await projectRoleDAL.findOne({ slug: invitedProjectRole, projectId });
-          if (!customRole) throw new BadRequestError({ name: "Invite membership", message: "Project role not found" });
-          customRoleId = customRole.id;
-        }
-        await projectUserMembershipRoleDAL.insertMany(
-          projectMemberships.map(({ id }) => ({ projectMembershipId: id, role: projectRole, customRoleId })),
-          tx
-        );
+        const sanitizedProjectMembershipRoles: TProjectUserMembershipRolesInsert[] = [];
+        invitedProjectRoles.forEach((projectRole) => {
+          const isCustomRole = Boolean(customRolesGroupBySlug?.[projectRole]?.[0]);
+          projectMemberships.forEach((membership) => {
+            sanitizedProjectMembershipRoles.push({
+              projectMembershipId: membership.id,
+              role: isCustomRole ? ProjectMembershipRole.Custom : projectRole,
+              customRoleId: customRolesGroupBySlug[projectRole] ? customRolesGroupBySlug[projectRole][0].id : null
+            });
+          });
+        });
+        await projectUserMembershipRoleDAL.insertMany(sanitizedProjectMembershipRoles, tx);
 
         await projectKeyDAL.insertMany(
           newWsMembers.map((el) => ({
diff --git a/backend/src/services/org/org-types.ts b/backend/src/services/org/org-types.ts
index f89a602ad..ef0a5606a 100644
--- a/backend/src/services/org/org-types.ts
+++ b/backend/src/services/org/org-types.ts
@@ -34,7 +34,7 @@ export type TInviteUserToOrgDTO = {
   organizationRoleSlug: string;
   projects?: {
     id: string;
-    projectRoleSlug?: string;
+    projectRoleSlug?: string[];
   }[];
 };
 
diff --git a/frontend/src/hooks/api/users/types.ts b/frontend/src/hooks/api/users/types.ts
index 6a6c35d93..6c538811b 100644
--- a/frontend/src/hooks/api/users/types.ts
+++ b/frontend/src/hooks/api/users/types.ts
@@ -150,7 +150,7 @@ export type DeletOrgMembershipDTO = {
 
 export type AddUserToOrgDTO = {
   inviteeEmails: string[];
-  projects?: { id: string; projectRoleSlug: string }[];
+  projects?: { id: string; projectRoleSlug: string[] }[];
   organizationRoleSlug: string;
   organizationId: string;
 };
diff --git a/frontend/src/views/Org/MembersPage/components/OrgMembersTab/components/OrgMembersSection/AddOrgMemberModal.tsx b/frontend/src/views/Org/MembersPage/components/OrgMembersTab/components/OrgMembersSection/AddOrgMemberModal.tsx
index 2a615237b..7194432c5 100644
--- a/frontend/src/views/Org/MembersPage/components/OrgMembersTab/components/OrgMembersSection/AddOrgMemberModal.tsx
+++ b/frontend/src/views/Org/MembersPage/components/OrgMembersTab/components/OrgMembersSection/AddOrgMemberModal.tsx
@@ -129,7 +129,7 @@ export const AddOrgMemberModal = ({
         organizationId: currentOrg?.id,
         inviteeEmails: emails.split(",").map((email) => email.trim()),
         organizationRoleSlug,
-        projects: projectIds.map((id) => ({ id, projectRoleSlug }))
+        projects: projectIds.map((id) => ({ id, projectRoleSlug: [projectRoleSlug] }))
       });
 
       setCompleteInviteLinks(data?.completeInviteLinks ?? null);
diff --git a/frontend/src/views/Project/MembersPage/components/MembersTab/components/AddMemberModal.tsx b/frontend/src/views/Project/MembersPage/components/MembersTab/components/AddMemberModal.tsx
index 8a5fe705a..6db92861e 100644
--- a/frontend/src/views/Project/MembersPage/components/MembersTab/components/AddMemberModal.tsx
+++ b/frontend/src/views/Project/MembersPage/components/MembersTab/components/AddMemberModal.tsx
@@ -101,9 +101,7 @@ export const AddMemberModal = ({ popUp, handlePopUpToggle }: Props) => {
     members?.forEach((member) => {
       wsUserUsernames.set(member.user.username, true);
     });
-    return (orgUsers || []).filter(
-      ({ status, user: u }) => status === "accepted" && !wsUserUsernames.has(u.username)
-    );
+    return (orgUsers || []).filter(({ user: u }) => !wsUserUsernames.has(u.username));
   }, [orgUsers, members]);
 
   return (