We are seeking experienced full-stack developers (or a small senior team) to help build a private, members-only B2B platform designed for verified companies to connect, collaborate, and transact securely. This is not a social network and not a public marketplace. The platform is company-only, highly structured, and driven by AI-based matching between business opportunities and verified companies. We already have: A detailed product vision A full PRD and technical architecture Clear workflows and data models Defined MVP scope We are now looking for execution-focused developers who can build this properly from the ground up. Scope of Work (High-Level) The selected developer(s) will work on: A closed, authenticated web platform Company registration and verification workflows Role-based access control Secure document uploads Internal company directory and search Opportunity posting (offers, requirements, RFQs) Private company-to-company messaging Industry-specific discussion areas Background AI services for intelligent matching and notifications Scalable backend architecture and clean APIs Technical Requirements Applicants must have strong experience in: Backend Node.js (NestJS preferred) or Django / FastAPI PostgreSQL RESTful API design Authentication & authorization (JWT / sessions) Background jobs & queues (Redis, BullMQ, Celery, etc.) Frontend React (Next.js preferred) TypeScript Modern UI frameworks (Tailwind, MUI, or similar) AI / Data (Required) Practical experience with: Semantic search / embeddings AI-assisted matching or recommendations Working with LLM APIs Vector databases (pgvector, Pinecone, Qdrant, etc.) Infrastructure Docker Cloud deployment (AWS, GCP, or Azure) Secure file storage (e.g. S3) CI/CD basics