Custom API Middleware Bridge for Virtual ISP Launch

We are seeking a senior Backend Integration Engineer or Software Agency for a structured, fixed-price contract to design, deploy, and test a headless, containerized API Middleware Bridge (Node.js/TypeScript or Python). This bridge will serve as the core data orchestration hub connecting our core BSS/OSS system (Splynx), our local payment layer (Frisbii), an identity broker (MitID), and the wholesale network endpoints (OpenNet B2B API). 1. Your preferred backend stack (Node.js/TypeScript or Python) and deployment hosting architecture (Docker, AWS, DigitalOcean, etc.).