Software Engineer, Backend

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 that connect businesses to HIFI’s financial infrastructure platform, with a focus on performance, reliability, and developer experience. - Core Infrastructure: Build and scale backend systems that process transactions, ensure correctness, and provide 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: Participate in technical roadmap planning and carry projects from design through production. - User Focus: Engage with customers to understand their needs and translate them into effective solutions. What We're Looking For - Bachelor’s degree in Computer Science, Engineering, Math, or related STEM fiel