Backend Engineer, Crypto

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 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

Tools We UseWe 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.