Mobile Engineer

The role

The Mobile Engineer will own the Fin mobile experience across iOS and Android using React Native. You will design and implement flows for sending, receiving, and managing money while working with founders and the engineering team.

What you will do

• Own the Fin mobile app across iOS and Android using React Native
• Design and implement flows for sending, receiving, and managing money
• Help design secure account and custody patterns
• Collaborate with design and product to prototype, refine, and ship new features
• Maintain a high bar for code quality through architecture, code review, and testing
• Work with backend and infra engineers to integrate APIs, payments, and security features

Required qualifications

• 3+ years of experience building and shipping mobile apps in React Native
• Deep familiarity with the Expo ecosystem and modern mobile build pipelines (EAS)
• Strong product sense and attention to detail in UI and UX
• Solid understanding of mobile app architecture, performance, and offline or edge cases
• Ability to work independently, set priorities, and drive projects from idea to shipped
• Strong communication skills
• Interest in payments, fintech, or crypto

Nice to have

• Shipped an app from concept to production in a small team or as the primary developer
• Experience in EITHER traditional consumer fintech apps (neobanks, peer-to-peer payments) OR mobile crypto wallets (Solana, non-custodial, etc)
• Experience with cloud platforms such as GCP or AWS
• Experience deploying smart contracts on Solana or integrating with blockchain based systems
• Background in security, threat modeling, or penetration testing

About the company

Fin is a next-generation payments platform built for high-value, global, and instant transactions. It is a Series A-stage company backed by Sequoia, Circle, and other notable investors.