diff --git a/app/jobs/user_assignments/propagate_assignment_job.rb b/app/jobs/user_assignments/propagate_assignment_job.rb
index 4705d3940..f54d51d22 100644
--- a/app/jobs/user_assignments/propagate_assignment_job.rb
+++ b/app/jobs/user_assignments/propagate_assignment_job.rb
@@ -4,18 +4,14 @@ module UserAssignments
   class PropagateAssignmentJob < ApplicationJob
     queue_as :high_priority
 
-    def perform(object, user, user_role, assigned_by, destroy: false)
+    def perform(project, user, user_role, assigned_by, destroy: false)
       @user = user
       @user_role = user_role
       @assigned_by = assigned_by
       @destroy = destroy
 
       ActiveRecord::Base.transaction do
-        if object.is_a? Project
-          sync_experiments_user_associations(object)
-        elsif object.is_a? Experiment
-          sync_my_modules_user_assignments(object)
-        end
+        sync_experiments_user_associations(project)
       end
     end
 
@@ -51,7 +47,7 @@ module UserAssignments
     end
 
     def destroy_user_assignment(object)
-      UserAssignment.find_by(user: @user, assignable: object).destroy_all
+      UserAssignment.where(user: @user, assignable: object).destroy_all
     end
   end
 end
diff --git a/spec/jobs/user_assignments/generate_user_assignments_job_spec.rb b/spec/jobs/user_assignments/generate_user_assignments_job_spec.rb
new file mode 100644
index 000000000..12ef612b8
--- /dev/null
+++ b/spec/jobs/user_assignments/generate_user_assignments_job_spec.rb
@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+require 'rails_helper'
+
+module UserAssignments
+  RSpec.describe GenerateUserAssignmentsJob, type: :job do
+    let!(:owner_role) { create :owner_role }
+    let!(:viewer_role) { create :viewer_role }
+    let!(:technician_role) { create :technician_role }
+
+    let!(:user_one) { create :user }
+    let!(:user_two) { create :user }
+    let!(:user_three) { create :user }
+    let!(:team) { create :team, created_by: user_one }
+    let!(:project) { create :project, team: team, created_by: user_one }
+
+    before do
+      available_roles = [owner_role, viewer_role, technician_role]
+      [user_one, user_two, user_three].each_with_index do |user, i|
+        create :user_team, :admin, user: user, team: team
+        create :user_project, user: user, project: project
+        create :user_assignment,
+               assignable: project,
+               user: user,
+               user_role: available_roles[i],
+               assigned_by: user
+      end
+    end
+
+    describe 'perform' do
+      context 'experiment' do
+        let!(:experiment) { create :experiment, project: project }
+
+        it 'creates user assignments for all users on the project that are not assigned yet' do
+          expect {
+            described_class.perform_now(experiment, user_one)
+          }.to change(UserAssignment, :count).by(3)
+        end
+
+        it 'assigns the same role as the user had on project level' do
+          described_class.perform_now(experiment, user_one)
+          user_two_assignment = UserAssignment.find_by(user: user_two, assignable: experiment)
+          user_three_assignment = UserAssignment.find_by(user: user_three, assignable: experiment)
+          expect(user_two_assignment.user_role).to eq viewer_role
+          expect(user_three_assignment.user_role).to eq technician_role
+        end
+      end
+
+      context 'my_module' do
+        let!(:experiment) { create :experiment, project: project }
+        let!(:my_module) { create :my_module, experiment: experiment }
+
+        it 'creates user assignments for all users on the project that are not assigned yet' do
+          expect {
+            described_class.perform_now(my_module, user_one)
+          }.to change(UserAssignment, :count).by(3)
+        end
+
+        it 'assigns the same role as the user had on project level' do
+          described_class.perform_now(my_module, user_one)
+          user_two_assignment = UserAssignment.find_by(user: user_two, assignable: my_module)
+          user_three_assignment = UserAssignment.find_by(user: user_three, assignable: my_module)
+          expect(user_two_assignment.user_role).to eq viewer_role
+          expect(user_three_assignment.user_role).to eq technician_role
+        end
+      end
+    end
+  end
+end
diff --git a/spec/jobs/user_assignments/propagate_assignment_job_spec.rb b/spec/jobs/user_assignments/propagate_assignment_job_spec.rb
new file mode 100644
index 000000000..16da2620c
--- /dev/null
+++ b/spec/jobs/user_assignments/propagate_assignment_job_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+require 'rails_helper'
+
+module UserAssignments
+  RSpec.describe PropagateAssignmentJob, type: :job do
+    let!(:owner_role) { create :owner_role }+
+    let!(:technician_role) { create :technician_role }
+
+    let!(:user_one) { create :user }
+    let!(:user_two) { create :user }
+    let!(:team) { create :team, created_by: user_one }
+    let!(:project) { create :project, team: team, created_by: user_one }
+    let!(:user_project) { create :user_project, user: user_one, project: project }
+    let!(:experiment_one) { create :experiment, project: project }
+    let!(:experiment_two) { create :experiment, project: project }
+    let!(:my_module_one) { create :my_module, experiment: experiment_one }
+    let!(:my_module_two) { create :my_module, experiment: experiment_two }
+    let!(:user_assignment) do
+      create :user_assignment,
+             assignable: project,
+             user: user_one,
+             user_role: owner_role,
+             assigned_by: user_one
+    end
+
+    before do
+      [user_one, user_two].each do |user|
+        create :user_team, :admin, user: user, team: team
+      end
+    end
+
+    describe 'perform' do
+      it 'propagates the user assignments to project child object' do
+        expect {
+          described_class.perform_now(project, user_two, technician_role, user_one)
+        }.to change(UserAssignment, :count).by(4)
+      end
+
+      it 'propagates the user assignments to project child object with the same role' do
+        described_class.perform_now(project, user_two, technician_role, user_one)
+        [
+          UserAssignment.find_by(user: user_two, assignable: experiment_one),
+          UserAssignment.find_by(user: user_two, assignable: experiment_two),
+          UserAssignment.find_by(user: user_two, assignable: my_module_one),
+          UserAssignment.find_by(user: user_two, assignable: my_module_two),
+        ].each do |user_assignment|
+          expect(user_assignment.user_role).to eq technician_role
+        end
+      end
+
+      it 'removes all the child objects user assignments when the destroy flag is set' do
+        create :user_assignment, assignable: experiment_one, user: user_two, user_role: technician_role, assigned_by: user_one
+        create :user_assignment, assignable: experiment_two, user: user_two, user_role: technician_role, assigned_by: user_one
+        create :user_assignment, assignable: my_module_one, user: user_two, user_role: technician_role, assigned_by: user_one
+        create :user_assignment, assignable: my_module_two, user: user_two, user_role: technician_role, assigned_by: user_one
+
+        expect {
+          described_class.perform_now(project, user_two, technician_role, user_one, destroy: true)
+        }.to change(UserAssignment, :count).by(-4)
+      end
+    end
+  end
+end