diff --git a/app/inbox/signals.py b/app/inbox/signals.py
index ed5a2ee2f42..ff4c27fcb50 100644
--- a/app/inbox/signals.py
+++ b/app/inbox/signals.py
@@ -41,7 +41,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=bounty.bounty_owner_github_username),
+            get_user_model().objects.get(username__iexact=bounty.bounty_owner_github_username),
             bounty.url,
             'worker_applied',
             f'<b>{activity.profile.user} applied</b> to work on {bounty.title}'
@@ -51,7 +51,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=activity.metadata['worker_handle']),
+            get_user_model().objects.get(username__iexact=activity.metadata['worker_handle']),
             bounty.url,
             'worker_approved',
             f'You have been <b>approved to work on {bounty.title}</b>'
@@ -61,7 +61,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=activity.metadata['worker_handle']),
+            get_user_model().objects.get(username__iexact=activity.metadata['worker_handle']),
             bounty.url,
             'worker_rejected',
             f'Your request to work on <b>{bounty.title} has been rejected</b>'
@@ -71,7 +71,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=bounty.bounty_owner_github_username),
+            get_user_model().objects.get(username__iexact=bounty.bounty_owner_github_username),
             bounty.url,
             'start_work',
             f'<b>{activity.profile.user} has started work</b> on {bounty.title}'
@@ -81,7 +81,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=bounty.bounty_owner_github_username),
+            get_user_model().objects.get(username__iexact=bounty.bounty_owner_github_username),
             bounty.url,
             'work_submitted',
             f'<b>{activity.profile.user} has submitted work</b> for {bounty.title}'
@@ -91,7 +91,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         amount_paid = activity.metadata['new_bounty']['value_in_usdt_now']
         send_notification_to_user(
-            get_user_model().objects.get(username=bounty.bounty_owner_github_username),
+            get_user_model().objects.get(username__iexact=bounty.bounty_owner_github_username),
             activity.profile.user,
             bounty.url,
             'work_done',
@@ -103,7 +103,7 @@ def create_notification(sender, **kwargs):
         bounty = activity.bounty
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=bounty.bounty_owner_github_username),
+            get_user_model().objects.get(username__iexact=bounty.bounty_owner_github_username),
             bounty.url,
             'stop_work',
             f'<b>{activity.profile.user} has stopped work</b> on {bounty.title}'
@@ -114,7 +114,7 @@ def create_notification(sender, **kwargs):
         amount = activity.metadata['value_in_usdt_now']
         send_notification_to_user(
             activity.profile.user,
-            get_user_model().objects.get(username=bounty.bounty_owner_github_username),
+            get_user_model().objects.get(username__iexact=bounty.bounty_owner_github_username),
             bounty.url,
             'new_crowdfund',
             f'A <b>crowdfunding contribution worth {amount} USD</b> has been attached for {bounty.title}'