Backend Engineer, Crypto

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

• 5+ years of professional experience in backend or distributed systems development
• Experience with L2 blockchains
• Proven success building production-grade APIs and financial services at scale
• Proficiency in Node.js or similar modern backend frameworks (TypeScript, NestJS, Go, or Java)
• Familiarity with cloud-native architecture (Kubernetes, AWS) and event-driven or microservice-based systems
• Strong communication and collaboration skills across product and platform teams
• Drive and proactivity - everyone here is a builder and executor, We use Node and TypeScript on the server, leveraging the NestJS framework within a microservice-oriented architecture running on Kubernetes and AWS. On the client side, we build and ship product features for iOS, Android, and web platforms using React Native. While you don’t need experience with our exact stack, familiarity with modern software engineering practices will help you ramp up quickly.

• Competitive base salary, stock options, and health benefits from Day 1
• 401(k) plan with company match
• Remote-friendly (US), flexible time off (FTO), and opportunities for growth
• A high-growth, mission-driven, inclusive culture where your work has real impact

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