diff --git a/triton_viz/visualizer/interface.py b/triton_viz/visualizer/interface.py
index d01fd8cf..9fa30b5d 100644
--- a/triton_viz/visualizer/interface.py
+++ b/triton_viz/visualizer/interface.py
@@ -23,6 +23,31 @@
 last_local_port = None
 
 
+# Server state management
+class ServerState:
+    """Encapsulates server state to avoid global variables."""
+
+    def __init__(self):
+        self.last_public_url = None
+        self.last_local_port = None
+
+    def set_public_url(self, url):
+        self.last_public_url = url
+
+    def set_local_port(self, port):
+        self.last_local_port = port
+
+    def get_public_url(self):
+        return self.last_public_url
+
+    def get_local_port(self):
+        return self.last_local_port
+
+
+# Create a single instance for the module
+_server_state = ServerState()
+
+
 def precompute_c_values(op_data):
     input_data = op_data["input_data"]
     other_data = op_data["other_data"]
@@ -254,10 +279,9 @@ def run_flask_with_cloudflared(port: int = 8000, tunnel_port: int | None = None)
     cloudflared_port = port
     if tunnel_port is None:
         tunnel_port = cloudflared_port + 1
-    global last_public_url, last_local_port
     tunnel_url = _run_cloudflared(cloudflared_port, tunnel_port)
-    last_public_url = tunnel_url
-    last_local_port = cloudflared_port
+    _server_state.set_public_url(tunnel_url)
+    _server_state.set_local_port(cloudflared_port)
     print(f"Cloudflare tunnel URL: {tunnel_url}")
     app.run(host="0.0.0.0", port=cloudflared_port, debug=False, use_reloader=False)
 
@@ -283,7 +307,7 @@ def launch(share: bool = True, port: int | None = None):
 
         # Try to get the tunnel URL by making a request to the local server
         local_url = f"http://localhost:{actual_port}"
-        public_url = last_public_url
+        public_url = _server_state.get_public_url()
 
         try:
             # touch local server to ensure it's up
@@ -304,8 +328,7 @@ def launch(share: bool = True, port: int | None = None):
         local_url = f"http://localhost:{actual_port}"
         print(f"Running on local URL:  {local_url}")
         print("--------")
-        global last_local_port
-        last_local_port = actual_port
+        _server_state.set_local_port(actual_port)
 
         # Run Flask in a background thread so callers can continue (non-blocking)
         def _run_local():
@@ -320,7 +343,7 @@ def _run_local():
 
 def get_last_public_url():
     """Return the last Cloudflare public URL created by launch(share=True)."""
-    return last_public_url
+    return _server_state.get_public_url()
 
 
 @app.route("/shutdown", methods=["POST", "GET"])
@@ -342,7 +365,7 @@ def stop_server(port: int | None = None):
     Stop the running Flask server by calling the /shutdown endpoint.
     If port is None, it will try the last used local port.
     """
-    target_port = port or last_local_port
+    target_port = port or _server_state.get_local_port()
     if target_port is None:
         return False
     try: