Experienced Mobile Application Engineer

What You Will Do

This is a hands-on technical role, day to day activities include:

• Build, ship, and maintain mobile features for iOS and Android (React Native).
• Own features from discovery and technical design through implementation, testing, release, and monitoring.
• Implement clean, testable architecture and maintain high code quality through reviews and documentation.
• Integrate with GraphQL APIs and handle data persistence, offline caching, deep links, and background tasks.
• Ensure performance, security, accessibility, and localization best practices.
• Write automated tests (unit, integration, UI) and contribute to CI/CD pipelines and release processes.
• Monitor analytics and crash reports; use data to inform improvements.
• Collaborate with designers to implement pixel-perfect UIs and delightful interactions.
• Support App Store and Google Play submissions, release notes, and rollout strategies.

What We Can Expect from You

• Professional experience building and shipping mobile apps used in production
• Proficiency in React Native.
• Expert understanding of JavaScript and TypeScript, HTML, CSS (ideally tailwind).
• Strong understanding of mobile architectures and patterns, async programming and state management.
• API integration and data persistence (GraphQL, JSON, WebSockets; Core Data/Room/Realm/SQLite).
• Experience with version control (Git) and collaborative workflows (PRs, code reviews).
• Familiarity with release tooling and app store processes (App Store Connect, Google Play Console; Firebase/GitHub Actions or similar).
• Knowledge of security and privacy practices (secure storage, keychain/keystore, OWASP MASVS considerations).
• Clear communication and collaboration skills with a product mindset.
• Able to collaborate with designers to design scalable UI components as part of a design system.
• We use both English and Japanese in the team; business-level proficiency in both is required.
• Status of residence:
  • For those in Japan: must have a working visa valid for more than six months
  • For those outside of Japan: remote contract work is available until a visa can be prepared

What You Can Expect from Us

• ¥8.0 - 12.0 million/year (negotiable based on experience).
• 20+ paid days off per year.
• Flexible work hours, opportunity to work remotely.
• Social and health insurance.
• Commuting subsidy and work equipment provided.
• An international team of talented and engaged creators who will value your input.
• Visa sponsorship (after 6-month trial period).