I’m looking for an experienced full-stack developer or team to build an MVP of TradeFlow, a secure B2B transaction platform where buyers and sellers can digitally agree on terms, use escrow payments, verify documents, and release funds only after proof of delivery. Core Workflow Buyer or Seller creates a transaction and uploads a mandatory document (PO / Proforma / Quotation). Counterparty reviews terms (delivery, payment, inspection, etc.) and both digitally sign. Buyer deposits payment into escrow (RazorpayX / EscrowPay). Seller uploads packing slip, invoice, photos/videos for buyer approval. Payment released by Buyer (with 48-hour admin fallback). Optional manual inspection before dispatch. All documents compiled into an auto-generated Proof Pack PDF. Required Features Buyer/Seller dashboards Admin console for manual verification, disputes, and inspections Escrow API integration with webhooks OCR for invoice total + GSTIN check WhatsApp / Email / SMS notifications Secure file storage and audit trail Broad Deliverables User Management & Authentication Buyer, Seller, and Admin login with company profile & KYC setup. Transaction Workflow Sequential process: initiator fills details → counterparty reviews → both sign digitally. Mandatory document upload (PO / Proforma / Quotation). Auto-generated Terms Sheet & OTP-based e-signature. Escrow Integration RazorpayX / EscrowPay sandbox setup. Buyer-side payment initiation & webhook status updates. Buyer-first fund release (48-hour admin fallback). Document & Proof System Upload & verification for invoices, packing slips, visuals, delivery proofs. Pre-payment checkpoints and payment triggers. OCR verification for invoice totals & GSTIN. Inspection & Dispute Handling Buyer can request manual inspection (chargeable). Dispute system with evidence upload and admin resolution panel. Admin Dashboard Queues for escrow approvals, triggers, disputes, inspections, and retention. Manual fund release and decision logging. Proof Pack & Vault Auto-generated Proof Pack PDF (terms, signatures, documents, receipts). Document vault for closed transactions. Notifications & Security WhatsApp / Email / SMS alerts. Encrypted file storage (AWS S3) and full audit logging. Deployment & Documentation Full MVP deployment on staging and production. Source code, API documentation, admin/user manual, and 120-day support.