React Native Engineer
CashMine is building the everyday app for crypto money. Connect every exchange and wallet account, see all your assets in one place, and move funds in a few taps. Beyond managing assets, CashMine keeps finding new ways for them to earn - starting with payback, which returns part of your trading fees, already live on the web. The CashMine app for iOS and Android is next.
You will build the CashMine app in React Native, ship it to the App Store and Google Play, and maintain it after launch. The app is at an early stage, so you will shape its architecture and quality bar.
Responsibilities:
- Build the CashMine app with Expo / React Native and TypeScript, from foundation to public launch
- Ship to the App Store and Google Play and own the release process
- Maintain the app after launch: crashes, performance, SDK and OS upgrades, store policy changes
- Implement sign-in, wallet and account-connection flows with design and product
- Write tests, review code and document technical decisions
Requirements:
- 3+ years of professional software engineering, mainly React Native (preferred)
- At least one production React Native app shipped and maintained on both iOS and Android
- Experience building a financial product - fintech, payments, banking, trading or crypto
- Strong TypeScript and React, including state management, navigation and performance
- Working knowledge of native tooling: Xcode, Gradle, CocoaPods and native modules
- Hands-on release experience: code signing, store review, staged rollouts, crash monitoring
- A strong sense of ownership: you deliver independently in a remote team and raise problems early
- Clear, proactive written communication in English
Preferred qualifications:
- Expo, EAS and Expo Router
- Mobile or embedded wallets (e.g. Privy) and WalletConnect
- Security for financial apps: secure storage, biometrics, certificate pinning
- Push notifications, deep links and universal links
- Node.js backend experience
- Experience in an early-stage or fully remote team
How we work:
Culture fit matters more than anything else. We are a small, fully remote team that runs on trust, not supervision.
- Ownership: you own the result, not the ticket. If production breaks, you're on it.
- Accountability: you do what you say. If a plan slips, we hear it from you first.
- Written & async: decisions live in PRs and docs, so anyone can act without a meeting.
- Correctness first: we move real money. When unsure, we stop, check and say so.
Our stack:
Expo, React Native, Expo Router, TypeScript, TanStack Query, Reanimated; Node.js, Fastify, PostgreSQL, Prisma, Redis; EVM (Arbitrum), embedded wallets.
Work conditions:
- Full-time, fully remote
- Flexible hours, with some overlap with Korea Standard Time (KST, UTC+9)
Hiring process:
CV review -> Technical interview -> Culture-fit interview -> Reference check -> Offer
How to apply:
Apply here with your CV and links to apps or code you built. For at least one project, describe the problem, your contribution, the hardest challenge and how you solved it.