I want to build an end-to-end solution that visualises where demand is occurring and where supply is currently located, all updated in real time. Scope • Web application: an interactive map that plots every active demand-side facility and each live supply-side order. Pins must update instantly as locations change. • iOS supplier app: captures the courier’s GPS signal, lets them accept or update orders, and streams coordinates to the web map with minimal latency. • Back-end: secure user authentication, order management, WebSocket or similar real-time channel, and scalable database/storage. • Admin and analytics: basic dashboards to review historical trips, order status, and performance metrics. Must-Haves • Proven experience delivering real-time tracking or mapping products. • Smooth, battery-efficient location tracking on iOS (foreground and background). • Clean, modern UI on both web and mobile. • Robust error handling, data privacy, and GDPR-friendly logging. Nice-to-Have • Tech stack suggestions (e.g., React or Vue for the web, Swift with Combine on iOS, Node.js, Firebase, AWS, or similar). • CI/CD pipeline and unit tests to keep future iterations painless. Timing There is no strict deadline, so propose a realistic milestone plan that covers architecture, MVP, iterative polishing, and final deployment. When applying, focus on your experience building similar real-time, map-based applications and highlight any live examples or case studies.