Mobile Engineer
Fin · New York, NY
About this role
## About Fin Fin is a next-generation payments platform built for high-value, global, and instant transactions. As a Series A-stage company backed by Sequoia, Circle, and other notable investors, Fin uses stablecoins to help users and businesses move millions of dollars in seconds—whether to other Fin users, directly into bank accounts, or across crypto rails. By combining the speed of crypto with the reliability and trust of traditional finance, Fin reimagines how money moves worldwide. --- ## About the Role We’re looking for a **Mobile Engineer** to own our mobile experience across **iOS and Android** using **React Native**. This will be the first time many users interact with Fin, so your work will shape how our product feels in the real world. You’ll turn complex real-world payment flows into simple, intuitive interfaces—and help hide the complexity of crypto, wallets, and cross-border settlement behind a smooth mobile experience. You’ll work closely with the founders and the engineering team to make foundational architecture/design decisions and ship features from idea to production. **We value your time:** our process focuses on practical system design and architectural discussions—not LeetCode grinding or unpaid take-home assignments. --- ## Responsibilities - Own the Fin mobile app across iOS and Android using React Native, from architecture to implementation and polish - Design and implement flows that make sending, receiving, and managing money feel simple and trustworthy for everyday users - Help design secure account and custody patterns that can scale to meaningful balances and real-world usage - Collaborate with design and product to prototype, refine, and ship new features quickly - Maintain a high bar for code quality through thoughtful architecture, code review, and testing - Work with backend and infra engineers to integrate APIs, payments, and identity/security features into the mobile app --- ## 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**) is required - Strong product sense and attention to detail in **UI/UX** for consumer-facing apps - Solid understanding of mobile app architecture, performance, and offline/edge cases - Ability to work independently, set priorities, and drive projects from idea to shipped - Strong communication skills and comfort collaborating with design, product, and backend teams - Interest in **payments, fintech, or crypto** (you don’t need to be a chain maximalist—curiosity helps) --- ## Bonus Points - Shipped an app from concept to production in a small team or as the primary developer - Experience with either: - Traditional consumer fintech apps (neobanks, peer-to-peer payments), **or** - Mobile crypto wallets (e.g., Solana, non-custodial) - 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—especially for consumer finance products
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