I need a web application built from scratch that lets me see every car in my fleet moving on an interactive map the very second its GPS unit reports a new position. Live location tracking is the non-negotiable core: the map should refresh automatically, show the latest latitude, longitude, speed, and timestamp, and allow me to click any vehicle marker to bring up its details. Mobile devices will post data to a REST/JSON endpoint (MQTT is also acceptable if you prefer). Your job includes designing that endpoint, saving the incoming data, and streaming it to the front-end with the shortest possible delay—WebSockets or Server-Sent Events are fine as long as latency stays low. The interface must open smoothly in modern browsers; a responsive layout that feels comfortable on phones as well as desktops is ideal, even though mobile wasn’t explicitly selected in the questionnaire. We will start with cars only. Later I may add trucks, route history, or geofencing alerts, so please keep the architecture modular and document where those hooks would live. Google Maps, Leaflet, Mapbox, or any mapping SDK you are comfortable with is fine, provided the licence allows commercial use. The stack is your call—Node.js, Python (Django/Flask/FastAPI), or PHP work for me as long as set-up is straightforward on a standard cloud VPS. Deliverables • Complete source code for both back-end and front-end • A small seed script or simulator I can run to see vehicles moving before the real devices are connected • Deployment instructions that let me bring up the system on a fresh Ubuntu server in one sitting • Brief usage guide covering how to add a vehicle, how to watch it, and where to change map keys or refresh intervals Acceptance criteria 1. When the simulator pushes new coordinates, the map updates in under two seconds without manual refresh. 2. Each car marker displays last location, speed, ignition time, and a coloured status (moving / idle). 3. Code passes installation and lint checks on first clone and run. If you have already tackled similar real-time dashboards, send a short link or GIF demo with your bid.