Senior Mobile Engineer (Android/iOS/Flutter)

A Tokyo-based venture studio is a subsidiary of a prominent global technology firm. As a corporate venture studio, we act as an institutional cofounder by proactively investing in and building ventures from the initial idea stage. We create new ventures from scratch with the goals of achieving product-market fit, growing profitable new businesses, and delivering substantial returns on investment. We are currently incubating ventures in various domains, both in Japan and globally.

We are seeking a senior mobile engineer with Flutter expertise to work with our dynamic product team to build and grow digital products from scratch, setting a strong foundation for our technical organization.

Our ideal engineer will have well-informed technical perspectives, supported by evidence, experience, and exceptional work products. They will actively seek ownership and accountability and thrive in high-velocity environments. In return, we offer the opportunity to build innovative products that meet real user needs, make foundational technical decisions, and contribute to structuring and leading a high-performing engineering team.

Requirements:

• 5+ years of experience in mobile application development (Android/iOS/Flutter).
• Experience working in a product-focused startup and building user-friendly applications (either B2B or B2C) from zero. Please note that candidates who have worked primarily in IT consultancies, software development agencies, and/or large corporations won't be a good fit for us.
• Strong knowledge of Flutter/Dart, having developed 2+ mobile applications using Flutter (bloc architecture is preferred).
• Proficient in utilizing mobile ecosystems, Firebase-like technologies, and other Google/Apple services for integrated user experiences.
• Deep service-oriented architecture experience (REST and OpenAPI/Swagger understanding).
• Understanding of design systems and component reuse in applications.
• Ability to set up release trains and CI/CD pipelines for the codebase.
• Experience in writing testable components and applying unit, functional, and integration tests.
• High level of competency across the full mobile development life cycle, including analyzing product specifications, building, testing, and resolving issues.
• Excellent critical thinking capabilities, proactive cross-functional communication skills, and the ability to learn quickly and continuously upskill in unfamiliar areas.

What's On the Offer

• International working environment
• Competitive salary