Backend Engineer

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. What You’ll Do Design, build, and maintain high-performance APIs and backend services that power our Web3 payments platformBuild new features to further our product experienceCollaborate with product and protocol teams to architect technical solutions that meet business requirementsWrite clean, well-tested code and participate in code reviews to maintain high engineering standardsContribute to incident response and debugging production issues to ensure system reliability Required Skills And Qualifications Strong experience building production backend systems with modern languagesProficiency in TypescriptDeep understanding of distributed systems, APIs, and database design principlesHands-on experience with cloud platforms and containerization technologiesSolid grasp of computer science fundamentals including data structures and algorithmsStrong problem-solving skills with ability to debug complex technical issuesClear communicator who can collaborate effectively with cross-functional teams Nice To Have (But Not Required) Production TypeScript experiencePreviously worked at crypto startup or Web3 infrastructure companyExperience with blockchain integrations, smart contracts, or DeFi protocolsBackground with high-scale payment processing or financial compliance systemsContributions to open source projects or technical writingExperience with event-driven architectures and real-time data processing Why Join Us Shape the future of payments and programmable moneyWork with bleeding-edge tech in a domain where innovation moves fastJoin a mission-driven team focused on access, openness, and trustBe a key contributor, not just a cog—your work will ship fast and matterCollaborate with top-tier protocols, builders, and financial infrastructure providers We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.