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0x Logo 0x · IT - Software Development

Senior Mobile Engineer

120000.00 - 230000.00 USD / Year · Job Posted December 01, 2025
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Job Description

Senior Mobile Engineer position focused on building Matcha's new React Native app for iOS and Android, shaping mobile crypto trading experience, and contributing to decentralized finance.

Job Responsibility

  • build and ship Matcha’s new React Native app for iOS and Android from the ground up
  • design robust architecture, state management, and in-app infrastructure (CI/CD, telemetry, feature flags)
  • implement high-performance mobile UX - snappy lists, smooth gestures, fast load times, and secure wallet flows
  • collaborate closely with design and product to prototype, iterate, and ship features quickly and safely
  • write clean, modern TypeScript and React Native code with proper typing, linting, and testing coverage (Jest, Detox/Maestro)
  • help define the mobile engineering culture - code reviews, pairing, testing discipline, and continuous performance tuning
  • contribute to open discussions on design trade-offs and product priorities with a user-first mindset

Requirements

  • 5+ years of mobile engineering experience with deep fluency in React Native and TypeScript
  • proven track record of shipping complex mobile apps - ideally from blank repo to App Store/Play Store
  • hands-on experience with modern RN patterns: custom hooks, Zustand/Recoil, Reanimated, FlatList, memoization, and performance profiling
  • experience working on crypto wallets or DeFi mobile products (e.g. Matcha, MetaMask, Safe, Uniswap, Phantom, Rainbow, Rabby, Backpack, etc.)
  • you understand key management, signing flows, transaction UX, and Web3 connectivity (WalletConnect, EIP-155)
  • understanding of native modules and when to use them for crypto or performance-critical tasks (Objective-C, Swift, Java, Kotlin a plus)
  • strong debugging habits and comfort profiling on real devices across Android and iOS
  • familiarity with mobile CI/CD pipelines, incremental rollouts, and feature flagging
  • excellent collaboration and communication skills - you think out loud, stay calm under pressure, and embrace feedback
  • a low-ego, ownership-driven approach to building great products with others
  • knowledge and passion for decentralized finance and the 0x mission
  • exhibit our core values: do the right thing, consistently ship, and focus on long-term impact
  • willingness to travel globally for two annual in-person team meetups - all travel expenses covered

Nice to have

  • knowledge of mobile security and key management best practices
  • prior native app development (iOS/Android)
  • familiarity with analytics pipelines and A/B testing on mobile
  • contributions to open source React Native or Web3 libraries

What we offer

  • equity
  • ZRX tokens
  • comprehensive insurance (medical/dental/vision/life/disability) for U.S.-based employees — 100% of base plan covered for you and dependents
  • 401k and FSA for U.S.-based employees
  • monthly mobile phone bill, wellness, and pre-tax transportation expense
  • covered mental health benefits (included professional therapy sessions)
  • a supportive remote environment
  • lunch reimbursement for all employees across the globe
  • stipend for your ideal remote / WFH set-up: headphones, and any other work gear you may need
  • 12-week paid parental leave
  • great office conveniently located in the SF Financial District for those in the region
  • flexible vacation: take time when you need it (and we really mean it)
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