Capital markets are undergoing a fundamental shift. Assets that live in fragmented systems and manual workflows are moving onto blockchains -systems designed to move and store value more transparently and efficiently.
While this unlocks more open and programmable financial systems, it also introduces significant complexity. For most users, interacting with this new infrastructure is still too difficult.
Fun builds the infrastructure that powers consumer-facing fintech applications - handling onboarding, account access, and money movement so users can interact with blockchain-based systems as seamlessly as they do with traditional finance.
For fintech builders, Fun provides a best-in-class onboarding and deposit stack that drives conversion and unlocks user growth. We operate at the intersection of financial infrastructure, complex engineering, and product experience.
About the Role
We’re looking for a BackEnd Engineer to join our growing team at Fun and help architect the backend services that power our web3 payments infrastructure. This role is foundational to the success of our platform and will shape how payments, settlement, and transaction routing are handled across chains and payment providers. You’ll be working on high-performance, low-latency systems that support complex use cases like asset conversion, identity and security verification, transaction finality, and decentralized routing—while ensuring fault tolerance, scalability, and compliance across a global user base.
Location: Midtown, New York, NY (In-office Mon–Thurs, Remote Fridays)
Team: Payments Infrastructure – Mid, Senior, Staff, or Principal Levels
Responsibilities
Design, build, and maintain high-performance APIs and backend services that power our Web3 payments platform
Build new features to further our product experience
Collaborate with product and protocol teams to architect technical solutions that meet business requirements
Write clean, well-tested code and participate in code reviews to maintain high engineering standards
Contribute to incident response and debugging production issues to ensure system reliability
Requirements
Strong experience building production backend systems with modern languages
Proficiency in Typescript
Deep understanding of distributed systems, APIs, and database design principles
Hands-on experience with cloud platforms and containerization technologies
Solid grasp of computer science fundamentals including data structures and algorithms
Strong problem-solving skills with ability to debug complex technical issues
Clear communicator who can collaborate effectively with cross-functional teams
Nice to Have
Production TypeScript experience
Previously worked at crypto startup or Web3 infrastructure company
Experience with blockchain integrations, smart contracts, or DeFi protocols
Background with high-scale payment processing or financial compliance systems
Contributions to open source projects or technical writing
Experience with event-driven architectures and real-time data processing
