Software Engineer, Backend

About this role

WHY WE EXIST

Money should move as easily as data.

It doesn't today. Technology is finally catching up to the need — customers expect instant, global, programmable money. HIFI exists to fix that. Our mission is to make money programmable by default, and to give developers and businesses the tools to move value at software speed.

We're rebuilding the financial plumbing of the internet from the ground up.

THE ROLE

As a Senior Backend Engineer at HIFI, you'll own critical components of our payments infrastructure — from API design and data modeling to event-driven pipelines and financial-grade reliability. You'll work across the full lifecycle of modern money movement: account creation, fiat and stablecoin settlement, global payouts, and onchain connectivity.

This is not a maintenance role. You'll solve hard, novel problems at the edge of what's possible in financial infrastructure, move fast, own your systems end-to-end, and directly shape how billions of dollars flow through the internet.

If you touch it, you own it. That's how we work.

WHAT YOU'LL BUILD

• **API Development:** Design, implement, and optimize APIs connecting businesses to HIFI's financial infrastructure, with a focus on performance, reliability, and developer experience.
• **Core Infrastructure:** Build and scale backend systems that process transactions with strong guarantees around scalability, reliability, and fault tolerance.
• **System Performance:** Continuously improve throughput, efficiency, and resilience across distributed services.
• **Collaboration:** Work closely with product, compliance, and business teams to deliver end-to-end solutions.
• **Ownership:** Carry projects from design through production and participate in technical roadmap planning.

WHAT WE'RE LOOKING FOR

• Bachelor's degree in CS, Engineering, Math, or related STEM field — or equivalent experience
• 4+ years building and shipping backend systems in production at scale
• Proficiency in JavaScri...