Backend Engineer, Crypto

ABOUT ONEPAY

OnePay is the consumer fintech trusted by millions of Americans to make money better.

Our financial system is broken. High fees, low rates, and too few ways to actually grow your money. We’re fixing it. And we’re moving fast.

We’re an all-in-one financial services platform that brings together banking, high-yield savings, credit cards, point-of-sale lending, investing, and crypto in one place. We also partner with employers, HCM providers, gig platforms, and others to deliver embedded financial services to millions of employees and frontline workers.

We’re backed by Walmart, the world’s largest retailer, and Ribbit Capital, one of fintech’s most respected investors, giving us rare scale, distribution, and the opportunity to build something truly category-defining.

But what really sets OnePay apart is how we move. Our customers don’t have time to wait… and neither do we. This place moves fast, and we’re looking for people who are:

- Ready to run

- Hungry and driven by urgency

- Exceptional at what they do, with low ego

- Comfortable operating in motion

THE ROLE

As a Backend Engineer on the Crypto team at OnePay, your work will help define how customers buy and hold digital assets safely within our financial ecosystem — ensuring every experience meets the same standard of trust, performance, and scalability as our core banking systems. You will:

- Build and maintain backend services that enable our crypto product

- Design APIs and event-driven architectures to handle high-volume transaction processing securely and efficiently

- Partner with platform and infrastructure engineers to ensure scalability, observability, and resilience

- Contribute to documentation, tooling, and best practices that raise the bar across our engineering organization

YOU BRING

- 5+ years of professional experience in backend or distributed systems development

- Experience with L2 blockchains

- Proven success building production-grade APIs and...