Senior Fullstack Developer Node.Js - Payments Permanent Contract H/F Eiquem

Détail du poste

La mission

To join their new team of 3 developers building their own payment solution, Sanjow is looking for a highly motivated and talented Full Stack Developer (Node.js).
They're seeking someone with proven expertise - and genuine passion - for the e-commerce sector, hands-on experience in payments and subscriptions, and solid mastery of the Agile SCRUM methodology. This is a small, fast-moving team, so BE ready to roll up your sleeves and dive in !

You'll work closely with product leadership and technical peers to design, build, and deploy a modern billing system that includes rebill logic, smart routing, retries, and deep integrations with multiple PSPs.

Your main missions will BE :
- Architect and develop Sanjow's Payment Box
- Implement payment features such as smart routing, retry logic, and direct PSP integrations
- Collaborate with Product and Data teams to define use cases and KPIs
- Build and maintain integrations with existing services and APIs
- Ensure high availability, traceability, and observability of transactions
- Help define best practices for testing, release cycles, and monitoring

Tech Stack :
- Languages : TypeScript / JavaScript
- Backend : Node.js, Express, Prisma (NestJS is a plus)
- Frontend : React, Next.js
- Database : PostgreSQL, Redis
- Infrastructure : Render, Vercel, GitHub
- Methodology : Agile (2-week sprints), CI/CD

Why choose Sanjow?
- Play a key role in one of their most strategic initiatives
- Enjoy high autonomy and ownership in a lean, fast-paced environment
- Build critical infrastructure from scratch
- Benefit from a flexible work culture and flat hierarchy

Who they're looking for :
- 5+ years' experience as a developer with strong skills in TypeScript, Node.js, and relational databases
- Proven experience building payment systems, PSPs, or billing logic
- Confident building API backends and asynchronous workflows
- Strong focus on code quality and modular, testable design
- Autonomous, results-driven, and performance-oriented
- Fluent in English (Portuguese is a strong plus)
- Bonus points for :
- Experience with smart retry logic, subscription lifecycles, or multi-MID routing
- Familiarity with master gateways such as Rebilly or IxoPay
- Interest in using AI tools to boost coding and development productivity