Backend Engineer, Web3 Payments

About the role

Fun builds the infrastructure behind consumer-facing fintech applications, handling onboarding, account access and money movement so users can interact with blockchain-based systems as easily as with traditional finance. It is looking for a Backend Engineer to help architect the backend services powering its Web3 payments infrastructure, covering payments, settlement and transaction routing across chains and payment providers. The role sits in the Payments Infrastructure team at mid, senior, staff or principal level.

Key responsibilities

• Design, build and maintain high-performance APIs and backend services for the Web3 payments platform
• Build new features that improve the product experience
• Work with product and protocol teams to architect technical solutions that meet business needs
• Write clean, well-tested code and take part in code reviews
• Help with incident response and debugging production issues

Required profile

• Strong experience building production backend systems with modern languages
• Deep understanding of distributed systems, APIs and database design
• Solid grasp of computer science fundamentals such as data structures and algorithms
• Strong problem-solving skills and clear communication with cross-functional teams

Required skills

• Proficiency in TypeScript
• Cloud platforms and containerization technologies
• Nice to have: production TypeScript experience, blockchain integrations, smart contracts or DeFi, event-driven architectures and real-time data processing

The role is primarily in-person at the company's Midtown, NYC headquarters, with Monday to Thursday in the office and optional WFH Fridays.