diff --git a/backend/app.py b/backend/app.py
index 2f6def5b2..a85499a05 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -37,7 +37,9 @@ def init_database(app):
     if "MONGO_URI" in app.config:
         client = MongoClient(app.config["MONGO_URI"])
         db = client["course_db"]
-        app.config["collection"] = db["parsed_courses"]
+        app.config["courses"] = db["parsed_courses"]
+        app.config["profiles"] = db["user_profile"]
+
         # else, set to None or Mock in case of testing
 
 def create_app(test_config=None):
@@ -96,7 +98,133 @@ def validate_cas_ticket():
         else:
             print("response status is not 200")
             return jsonify({"isAuthenticated": False}), 401
+        
+    @app.route("/api/save_chat", methods=["POST"])
+    def save_chat():
+        try:
+            chat_data = request.get_json()
+            collection = app.config["courses"]
+            result = collection.insert_one(chat_data)
+            return jsonify({"status": "success", "id": str(result.inserted_id)}), 201
+        except Exception as e:
+            return jsonify({"status": "error", "message": str(e)}), 500
+        
+    @app.route("/api/reload_chat", methods=["POST"])
+    def reload_chat():
+        try:
+            data = request.get_json()
+            chat_id = data.get("chat_id")
+            collection = app.config["courses"]
+            chat = collection.find_one({"_id": str(chat_id)})
+            if chat:
+                return jsonify({"status": "success", "chat": chat}), 200
+            else:
+                return jsonify({"status": "not found"}), 404
+        except Exception as e:
+            return jsonify({"status": "error", "message": str(e)}), 500
+        
+    @app.route("/api/verify_course_code", methods=["POST"])
+    def verify_course_code():
+        try:
+            data = request.get_json()
+
+            uid = data.get("uid")
+            if not uid:
+                return jsonify({"error": "No uid provided"}), 400
+
+            course_code = data["search"]
+            course_collection = app.config["courses"]
+            user_collection = app.config["profiles"]
+            course = course_collection.find_one({"course_code": course_code})
+            if course:
+                # insert into database
+                result = user_collection.update_one({"uid": uid}, {"$addToSet": {"courses": course_code}})
+                return jsonify({"status": "success", "course": course['course_code']}), 200
+            else:
+                return jsonify({"status": "invalid course code"}), 404
+        except Exception as e:
+            return jsonify({"status": "error", "message": str(e)}), 500
 
+    @app.route("/api/delete_course_code", methods=["POST"])
+    def delete_course_code():
+        try:
+            data = request.get_json()
+
+            uid = data.get("uid")
+            if not uid:
+                return jsonify({"error": "No uid provided"}), 400
+
+            course_code = data["search"]
+            course_collection = app.config["courses"]
+            user_collection = app.config["profiles"]
+            course = course_collection.find_one({"course_code": course_code})
+            if course:
+                # insert into database
+                result = user_collection.update_one({"uid": uid}, {"$pull": {"courses": course_code}})
+                return jsonify({"status": "success", "course": course['course_code']}), 200
+            else:
+                return jsonify({"status": "invalid course code"}), 404
+        except Exception as e:
+            return jsonify({"status": "error", "message": str(e)}), 500
+
+    # must only call after checking if the user exists
+    @app.route("/api/user/create", methods=["POST"])
+    def create_user_profile():
+        data = request.get_json()
+        uid = data.get("uid", None)
+        if not uid:
+            return jsonify({"error": "No uid provided"})
+        
+        collection = app.config["profiles"]
+
+        user_profile = {
+            "uid": uid,
+            "chat_history": [],
+            "courses": [],
+            "name": "",
+        }
+
+        result = collection.insert_one(user_profile)
+        user_profile['_id'] = str(result.inserted_id)
+
+        return jsonify(user_profile)
+
+    @app.route("/api/user/profile", methods=["POST"])
+    def get_user_profile():
+        data = request.get_json()
+        uid = data.get("uid", None)
+        if not uid:
+            return jsonify({"error": "No uid provided"})
+
+        collection = app.config["profiles"]
+        user_profile = collection.find_one({"uid": uid})
+        if not user_profile:
+            return jsonify({"error": "No user profile found"}), 404
+
+        # Convert ObjectId to string
+        user_profile['_id'] = str(user_profile['_id'])
+
+        return jsonify(user_profile)
+
+    def update_user_profile(uid, update):
+        collection = app.config["profiles"]
+        user_profile = collection.find_one({"uid": uid})
+        collection.update_one({"uid": uid}, {"$set": update})
+        user_profile = collection.find_one({"uid": uid})
+        user_profile['_id'] = str(user_profile['_id'])
+        return jsonify(user_profile)
+
+    @app.route("/api/user/update/name", methods=["POST"])
+    def update_user_name():
+        data = request.get_json()
+        uid = data.get("uid", None)
+        name = data.get("name", None)
+        if not uid:
+            return jsonify({"error": "No uid provided"})
+        if not name:
+            return jsonify({"error": "No name provided"})
+        return update_user_profile(uid, {"name": data.get("name")})
+    
     @app.route("/api/slug", methods=["POST"])
     def get_chat_history_slug():
         data = request.get_json()
@@ -123,7 +251,7 @@ def chat():
         user_messages = data.get("message", None)
 
         filter_season_codes = data.get("season_codes", None) # assume it is an array of season code
-        filter_subject = data.get("subject", None)
+        filter_subjects = data.get("subject", None)
         filter_areas = data.get("areas", None)
 
         if not user_messages:
@@ -211,7 +339,7 @@ def chat():
 
         query_vector = create_embedding(response)
 
-        collection = app.config["collection"]
+        collection = app.config["courses"]
 
         aggregate_pipeline = {
             "$vectorSearch": {
@@ -230,10 +358,10 @@ def chat():
                 }
             }
         
-        if filter_subject:
+        if filter_subjects:
             aggregate_pipeline["$vectorSearch"]["filter"] = {
                 "subject": {
-                    "$eq": filter_subject
+                    "$in": filter_subjects
                 }
             }