P2P & Merchant Payments
Real wallet ledger with atomic SQL transfers (Node.js/Express + Prisma + PostgreSQL) — a transfer either fully succeeds or fully fails, never a partial state.
Payment Aggregator MVP — A Real Working Payment API, Built Live
A Freelancer.com "API Development" contest — instead of a static mockup, I shipped a genuinely working backend: P2P transfers, merchant payments, and mandatory two-factor authentication on every transaction.
🏁 Contest entry — 28 entries were submitted for this one; it wasn't the entry selected, but the working demo below is a genuine skills showcase, kept here as a case study rather than a live link.
📋 The Brief
A Fintech MVP Needed Real Payment Flows
A Freelancer.com contest for the first MVP of a mobile payment aggregator: two payment flows (P2P and merchant), mandatory two-factor authentication on every transaction, and a documented, modular REST API ready for future trading modules. Most entries in contests like this are static app-screen mockups — I built the real backend instead: a working API, live database, and admin dashboard, deployed and testable.
🖥️ See It In Action
Real Screens, Real Data
Every screen below is a live screenshot of the actual working deployment — real API documentation, real transactions, real accounts (demo data only).
What Was Built
A Genuinely Functional Payment Backend
Mandatory 2FA, Every Transaction
Standard TOTP (Google Authenticator/Authy compatible), enforced server-side on every money-movement request — not a checkbox feature, a real gate.
Documented API + Docker Deployment
Full OpenAPI/Swagger docs, an admin dashboard, 13 automated Jest/Supertest tests, and a one-command Docker Compose deployment.
Stack: Node.js, Express, Prisma ORM, PostgreSQL, JWT auth, TOTP 2FA, Docker & Docker Compose.
Like What You See?
Need a Real Payment or Fintech API?
If your product needs a genuinely secure, well-documented backend — not just a prototype — let's talk.