Experienced Mobile Application Engineer

**About the company:** Scoville Tokyo Web-based HR products, cross-industry AI, IoT, Robotics, and Cloud & Big Data solutions. We work in a range of industries such as Human Resources, Hospitality, Education, Health Care, Warehousing & Inventory, and Health & Fitness. **Responsibilities:** 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. Requirements 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. Must be fluent in one language and at least conversational in the other. Nice to haves While not specifically required, tell us if you have any of the following. Meaningful experience with a functional backend language (such as Elixir, Ruby on Rails). Experience with AWS Services and Firebase. Experience in database development using Postgres. Compensation ¥8,000,000 ~ ¥12,000,000 annually. Negotiable based on experience. APPLY FOR THIS POSITION DO YOU NEED MORE INFO? ASK A QUESTION Meet Scoville's Developers Greenfield Development with a Global Team with Ellen Skipper At Scoville, Ellen works with a global team to develop a new management product for Japan’s visiting nursing industry. She talks about what drew her to Scoville, and the highlights and challenges of her work. Read their story... About Scoville Scoville Tokyo Web-based HR products, cross-industry AI, IoT, Robotics, and Cloud & Big Data solutions. We work in a range of industries such as Human Resources, Hospitality, Education, Health Care, Warehousing & Inventory, and Health & Fitness. Key benefits International and English-friendly Rapidly expanding Free weekly Japanese lessons Read more More jobs like this We'll send you a digest of new English-friendly software developer jobs in Japan. Your email stays private, we don't share or sell it. © 2026 Privacy Policy Get the newsletter × Insights into starting and growing your career as an English speaking developer in Japan, and new job opportunities as they are posted. **Requirements:** 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. Must be fluent in one language and at least conversational in the other. **Nice to have:** While not specifically required, tell us if you have any of the following. Meaningful experience with a functional backend language (such as Elixir, Ruby on Rails). Experience with AWS Services and Firebase. Experience in database development using Postgres. **Compensation:** ¥8,000,000 ~ ¥12,000,000 annually. Negotiable based on experience. APPLY FOR THIS POSITION DO YOU NEED MORE INFO? ASK A QUESTION Meet Scoville's Developers Greenfield Development with a Global Team with Ellen Skipper At Scoville, Ellen works with a global team to develop a new management product for Japan’s visiting nursing industry. She talks about what drew her to Scoville, and the highlights and challenges of her work. Read their story... About Scoville Scoville Tokyo Web-based HR products, cross-industry AI, IoT, Robotics, and Cloud & Big Data solutions. We work in a range of industries such as Human Resources, Hospitality, Education, Health Care, Warehousing & Inventory, and Health & Fitness. Key benefits International and English-friendly Rapidly expanding Free weekly Japanese lessons Read more More jobs like this We'll send you a digest of new English-friendly software developer jobs in Japan. Your email stays private, we don't share or sell it. © 2026 Privacy Policy Get the newsletter × Insights into starting and growing your career as an English speaking developer in Japan, and new job opportunities as they are posted.