Backend Developer for Hotel Supplier API Wrapper & B2B Booking API

We are looking for an experienced backend developer to build our own branded Hotel Booking API for our B2B travel agents. We already have access to a hotel supplier API. Our B2B agents must connect only to our API—not directly to the supplier. The supplier’s identity, API URL, credentials, original prices and booking references must remain confidential. Scope of Work * Integrate our existing hotel supplier API. * Develop our branded REST/JSON API. * Standardize and transform supplier responses. * Create separate API credentials for each B2B agent. * Support agent-specific markup and commission. * Generate our own hotel, rate and booking reference IDs. * Securely map our references to supplier references. * Add API rate limits, request logs and IP whitelisting. * Create complete Swagger/OpenAPI documentation. * Provide sandbox and production environments. Required API Functions * Destination and hotel search * Hotel details, images and facilities * Room availability and rates * Cancellation policies * Price and availability recheck * Create booking * Retrieve booking * Cancel booking * Generate booking voucher * Booking status notifications/webhooks * Proper timeout and error handling Preferred Technology * Node.js/NestJS * PostgreSQL * Redis * Swagger/OpenAPI * Docker, Nginx and Ubuntu Developer Requirements * Proven experience with hotel, OTA, travel or booking APIs. * Strong backend and third-party API integration experience. * Understanding of hotel rate changes, pre-booking/recheck, cancellation policies and uncertain booking statuses. * Ability to build secure, scalable and production-ready APIs. * Good English communication and technical documentation skills. Deliverables * Complete working source code owned by our company. * Supplier API integration. * Branded B2B Hotel API. * Agent authentication and pricing engine. * Swagger/OpenAPI documentation. * Sandbox and production deployment. * Database and deployment documentation. * Testing of search, booking and cancellation scenarios. * Post-deployment warranty for project-related bugs. When Applying Please answer the following: 1. Which hotel or travel APIs have you integrated? 2. Can you provide a relevant example or demonstration? 3. How will you prevent agents from accessing or identifying our supplier? 4. How will you manage price changes between search and booking? 5. How will you handle supplier timeouts and uncertain booking statuses? 6. What technology stack do you recommend? 7. What are your estimated timeline and fixed-price quotation? 8. What post-deployment support will you provide? 9. Are you willing to sign an NDA and transfer full source-code ownership? Start your proposal with the words “HOTEL API” so we know you have read the complete description. Generic proposals will not be considered.