Own the end-to-end development of an API-first payments product within a high-velocity environment. You will build resilient provider integrations, manage real-time transaction flows, and architect scalable monitoring layers. This role is central to building the infrastructure for global money movement, requiring a deep focus on reliability, idempotency, and rapid iteration cycles.
Senior Full-Stack Engineer at VC-backed cross-border fintech startup
Join a well-funded fintech startup in London as a Senior Full-Stack Engineer where you will own an API-based payments product end-to-end and build the resilient infrastructure required for global money movement across emerging international corridors. This high-impact role offers significant equity and the chance to solve mission-critical technical challenges like real-time transaction reliability, idempotency, and graceful degradation within an elite, high-velocity engineering team backed by top-tier venture capital firms.
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Location
London, United Kingdom
Compensation
Not Disclosed + Equity
Company
Confidential company
Role overview
About the company
VC-backed cross-border fintech startup
What you will do
- Design and ship complex payment provider integrations that handle high-volume transactions across multiple international corridors.
- Develop mission-critical monitoring and resilience layers, including retries and fallbacks, to ensure 24/7 transaction reliability.
- Communicate directly with institutional clients and providers to diagnose failures and optimize live payment flows.
Who this is a fit for
- Proven experience building and scaling production-grade payment systems, fintech products, or transaction processing engines.
- Strong proficiency in TypeScript, Node.js, and PostgreSQL with a backend-heavy, full-stack approach to software engineering.
- Exceptional resilience and problem-solving skills, comfortable managing live system failures and building automated recovery mechanisms.
Why this role is remarkable
- Directly impact global financial infrastructure by building systems that move real money across international borders every day.
- Join a pre-Series A startup backed by top-tier venture capital firms, offering significant equity and early-stage growth potential.
- Work in a high-performance, in-person environment with a fast-shipping culture and 7-day iteration cycles.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and Confidential company wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.