Full-Stack Developer for Delivery & Logistics Platform (Telegram, GPS, Rider & Admin System)

We are looking for an experienced Full-Stack Developer to build an MVP delivery/logistics management platform. The system will have three main parts: ### 1. Customer System Customers should be able to place delivery orders through a Telegram Bot / Telegram Web App. Features include: - Pickup and delivery locations using GPS / Map Pin - Item/order details - Automatic delivery-fee calculation - Order status tracking - Telegram notifications when order status changes ### 2. Rider / Driver System - New orders sent to riders - Riders can accept available orders - First rider to successfully accept an order gets it - Prevent multiple riders from accepting the same order - Google Maps directions for pickup/drop-off - Rider status updates: Picked Up / On the Way / Delivered - Customer/Admin automatically notified when status changes ### 3. Admin Dashboard - Manage customers, riders and orders - View active/current orders - Assign/reassign/cancel orders - Rider location / live tracking - Delivery fee records - Rider bonus and merchant cashback records - Database and/or Google Sheets synchronization ### Integrations - Telegram Bot / Telegram Web App - Google Maps / GPS - Real-time location/status updates - Viber integration may be added depending on API feasibility ### Preferred Stack Node.js / TypeScript / React or Next.js / PostgreSQL. Alternative technologies can be proposed if you can explain why they are more appropriate. ### When Applying Please provide: - Relevant projects you have built - Recommended architecture/technology - Fixed-price estimate - Estimated development time - Your availability - Experience with Telegram Bot/Web Apps - Experience with GPS/maps/live tracking IMPORTANT: Start your proposal with the word **RIDER** and briefly explain how you would technically prevent two riders from accepting the same order simultaneously. Generic proposals will not be considered. This is initially an MVP. Successful completion may lead to additional features and ongoing development.