diff --git a/terraso_backend/apps/collaboration/models/memberships.py b/terraso_backend/apps/collaboration/models/memberships.py
index 0a91ded41..69de78eb4 100644
--- a/terraso_backend/apps/collaboration/models/memberships.py
+++ b/terraso_backend/apps/collaboration/models/memberships.py
@@ -54,7 +54,10 @@ class MembershipList(BaseModel):
         default=DEFAULT_MEMERBSHIP_TYPE,
     )
 
-    def save_membership(self, user_email, user_role, membership_status, validation_func):
+    def save_membership(
+        self, user_email, user_role, membership_status, validation_func, membership_class=None
+    ):
+        membership_class = membership_class or Membership
         user = User.objects.filter(email=user_email).first()
         user_exists = user is not None
 
@@ -73,7 +76,7 @@ def save_membership(self, user_email, user_role, membership_status, validation_f
             raise ValidationError("User cannot request membership")
 
         if is_new:
-            membership = Membership(
+            membership = membership_class(
                 membership_list=self,
                 user=user if user_exists else None,
                 pending_email=user_email if not user_exists else None,
diff --git a/terraso_backend/apps/graphql/schema/schema.graphql b/terraso_backend/apps/graphql/schema/schema.graphql
index aa9ebef7e..e134fe9f8 100644
--- a/terraso_backend/apps/graphql/schema/schema.graphql
+++ b/terraso_backend/apps/graphql/schema/schema.graphql
@@ -1861,7 +1861,7 @@ input ProjectDeleteMutationInput {
 type ProjectAddUserMutationPayload {
   errors: GenericScalar
   project: ProjectNode!
-  membership: CollaborationMembershipNode!
+  membership: ProjectMembershipNode!
   clientMutationId: String
 }
 
@@ -1875,7 +1875,7 @@ input ProjectAddUserMutationInput {
 type ProjectDeleteUserMutationPayload {
   errors: GenericScalar
   project: ProjectNode!
-  membership: CollaborationMembershipNode!
+  membership: ProjectMembershipNode!
   clientMutationId: String
 }
 
@@ -1888,7 +1888,7 @@ input ProjectDeleteUserMutationInput {
 type ProjectUpdateUserRoleMutationPayload {
   errors: GenericScalar
   project: ProjectNode!
-  membership: CollaborationMembershipNode!
+  membership: ProjectMembershipNode!
   clientMutationId: String
 }
 
diff --git a/terraso_backend/apps/project_management/graphql/projects.py b/terraso_backend/apps/project_management/graphql/projects.py
index d190af631..79767ae88 100644
--- a/terraso_backend/apps/project_management/graphql/projects.py
+++ b/terraso_backend/apps/project_management/graphql/projects.py
@@ -25,9 +25,6 @@
 from graphene_django.filter import DjangoFilterConnectionField, TypedFilter
 
 from apps.audit_logs import api as log_api
-from apps.collaboration.graphql.memberships import (
-    CollaborationMembershipNode as MembershipNode,
-)
 from apps.collaboration.graphql.memberships import (
     MembershipListNodeMixin,
     MembershipNodeMixin,
@@ -73,7 +70,7 @@ def resolve_user_role(self, info):
         match self.user_role:
             case "viewer":
                 return UserRole.viewer
-            case "constributor":
+            case "contributor":
                 return UserRole.contributor
             case "manager":
                 return UserRole.manager
@@ -287,9 +284,9 @@ def mutate_and_get_payload(cls, root, info, **kwargs):
 
 class ProjectAddUserMutation(BaseWriteMutation):
     project = graphene.Field(ProjectNode, required=True)
-    membership = graphene.Field(MembershipNode, required=True)
+    membership = graphene.Field(ProjectMembershipNode, required=True)
 
-    model_class = Membership
+    model_class = ProjectMembership
 
     class Input:
         project_id = graphene.ID(required=True)
@@ -322,9 +319,10 @@ def validate(context):
                 user_role=role.value,
                 membership_status=Membership.APPROVED,
                 validation_func=validate,
+                membership_class=ProjectMembership,
             )
         except ValidationError as e:
-            cls.not_allowed_create(model=Membership, msg=e.message)
+            cls.not_allowed_create(model=cls.model_class, msg=e.message)
 
         membership_added_signal.send(sender=cls, membership=membership, user=request_user)
 
@@ -333,7 +331,7 @@ def validate(context):
 
 class ProjectDeleteUserMutation(BaseWriteMutation):
     project = graphene.Field(ProjectNode, required=True)
-    membership = graphene.Field(MembershipNode, required=True)
+    membership = graphene.Field(ProjectMembershipNode, required=True)
 
     model_class = Membership
 
@@ -380,10 +378,10 @@ def mutate_and_get_payload(cls, root, info, project_id, user_id):
 
 
 class ProjectUpdateUserRoleMutation(BaseWriteMutation):
-    model_class = Membership
+    model_class = ProjectMembership
 
     project = graphene.Field(ProjectNode, required=True)
-    membership = graphene.Field(MembershipNode, required=True)
+    membership = graphene.Field(ProjectMembershipNode, required=True)
 
     class Input:
         project_id = graphene.ID(required=True)
diff --git a/terraso_backend/apps/project_management/models/projects.py b/terraso_backend/apps/project_management/models/projects.py
index ff36f8902..2b7d37075 100644
--- a/terraso_backend/apps/project_management/models/projects.py
+++ b/terraso_backend/apps/project_management/models/projects.py
@@ -146,7 +146,9 @@ def add_user_with_role(self, user: User, role: str):
         )
 
     def get_membership(self, user: User):
-        return self.membership_list.memberships.filter(user=user).first()
+        return ProjectMembership.objects.filter(
+            membership_list=self.membership_list, user=user
+        ).first()
 
     def mark_seen_by(self, user: User):
         self.seen_by.add(user)