Marketplace · Fintech
RentFlow
Marketplace & Payment Infrastructure
Engagement
January 2026 — June 2026
Location
France
Type
Marketplace · Fintech
Full Stack TypeScript Developer
Project
Designed and developed a marketplace payment flow connecting a Next.js interface, a NestJS backend and Stripe Connect.
The challenge
Build a reliable payment flow for a marketplace involving connected accounts, webhooks and multiple business states.
Contributions
Developed React and Next.js interfaces related to the payment flow.
Designed a backend service using Node.js, TypeScript and NestJS.
Implemented a modular architecture with dependency injection.
Developed business endpoints and services.
Integrated Stripe Connect.
Integrated Stripe Checkout Embedded.
Implemented secure webhook processing.
Handled idempotency and duplicate processing.
Handled payments, deposits and refunds.
Implemented data validation and error handling.
Containerized the application with Docker.
Result
A marketplace payment flow built around a dedicated backend capable of reliably handling the different events throughout the payment lifecycle.
Technologies