diff --git a/services/token-service/main.py b/services/token-service/main.py
index 7832bf9..d403e4a 100644
--- a/services/token-service/main.py
+++ b/services/token-service/main.py
@@ -119,7 +119,7 @@ def get_github_handle_from_workspace_sa(service_account_email: str) -> str | Non
     Returns
     -------
     str | None
-        GitHub handle if found, None otherwise.
+        GitHub handle (normalized to lowercase) if found, None otherwise.
     """
     # For now, require github_handle to be passed in request body
     # In production, you could map this via metadata or workspace labels
@@ -129,16 +129,22 @@ def get_github_handle_from_workspace_sa(service_account_email: str) -> str | Non
         logger.warning("github_handle not provided in request")
         return None
 
+    # Normalize GitHub handle to lowercase for case-insensitive matching
+    # GitHub handles are case-insensitive but case-preserving
+    github_handle_normalized = github_handle.lower()
+
     # Verify this participant exists in Firestore
     try:
-        doc_ref = db.collection("participants").document(github_handle)
+        doc_ref = db.collection("participants").document(github_handle_normalized)
         doc = doc_ref.get()
 
         if not doc.exists:
-            logger.warning(f"Participant {github_handle} not found in Firestore")
+            logger.warning(
+                f"Participant {github_handle_normalized} not found in Firestore"
+            )
             return None
 
-        return github_handle
+        return github_handle_normalized
 
     except Exception as e:
         logger.error(f"Failed to verify participant: {e}")
diff --git a/src/aieng_platform_onboard/utils.py b/src/aieng_platform_onboard/utils.py
index 1304960..d7b47ce 100644
--- a/src/aieng_platform_onboard/utils.py
+++ b/src/aieng_platform_onboard/utils.py
@@ -38,6 +38,26 @@ def get_console() -> Console:
     return console
 
 
+def normalize_github_handle(github_handle: str) -> str:
+    """
+    Normalize GitHub handle to lowercase for case-insensitive matching.
+
+    GitHub handles are case-insensitive but case-preserving. This function
+    ensures consistent lookups in Firestore by normalizing to lowercase.
+
+    Parameters
+    ----------
+    github_handle : str
+        GitHub handle in any case.
+
+    Returns
+    -------
+    str
+        Normalized (lowercase) GitHub handle.
+    """
+    return github_handle.lower()
+
+
 def get_github_user() -> str | None:
     """
     Get GitHub username from environment variable.
@@ -145,7 +165,8 @@ def fetch_token_from_service(  # noqa: PLR0911
             "Authorization": f"Bearer {id_token}",
             "Content-Type": "application/json",
         }
-        payload = {"github_handle": github_handle}
+        # Normalize GitHub handle for case-insensitive matching
+        payload = {"github_handle": normalize_github_handle(github_handle)}
 
         response = requests.post(url, json=payload, headers=headers, timeout=30)
 
@@ -292,7 +313,9 @@ def get_participant_data(
         Participant data or None if not found.
     """
     try:
-        doc_ref = db.collection("participants").document(github_handle)
+        # Normalize GitHub handle for case-insensitive matching
+        github_handle_normalized = normalize_github_handle(github_handle)
+        doc_ref = db.collection("participants").document(github_handle_normalized)
         doc = doc_ref.get()
 
         if not doc.exists:
@@ -548,7 +571,9 @@ def check_onboarded_status(
         Tuple of (success, is_onboarded).
     """
     try:
-        doc_ref = db.collection("participants").document(github_handle)
+        # Normalize GitHub handle for case-insensitive matching
+        github_handle_normalized = normalize_github_handle(github_handle)
+        doc_ref = db.collection("participants").document(github_handle_normalized)
         doc = doc_ref.get()
 
         if not doc.exists:
@@ -633,7 +658,9 @@ def update_onboarded_status(
         Tuple of (success, error_message).
     """
     try:
-        doc_ref = db.collection("participants").document(github_handle)
+        # Normalize GitHub handle for case-insensitive matching
+        github_handle_normalized = normalize_github_handle(github_handle)
+        doc_ref = db.collection("participants").document(github_handle_normalized)
         doc_ref.update(
             {
                 "onboarded": True,