[Music] Senior Mobile Engineer (React Native & Hybrid)

Team Segment : Music About the Role: We're building a music streaming app that millions of people in Japan use every day — and there's a ton of new ground to cover. We are gradually expanding our technical stack from pure native (iOS/Android) to cross-platform solutions, with React Native as our primary driver for new features and fast iteration. Since our existing team is composed of seasoned native specialists, you will help us build our React Native foundation and be a key voice in our technical decisions. You will help design the integration of React Native into our existing apps, and establish our RN technical standards.You will act as the technical bridge between our cross-platform and native domains, partnering with veteran iOS and Android specialists to navigate complex mobile puzzles—such as low-latency audio sync, background tasks, and hybrid bridge optimizations. It's the perfect environment to push your platform engineering skills to the next level while shaping our core architecture. Team Culture: You'll join a Scrum-based cross-functional squad with iOS, Android, backend, QA engineers, product managers, and designers. We move fast, ship often, and value engineers who enjoy collaborating across different technical stacks. Responsibilities: Build and evolve our React Native Architecture: Work with the team to shape the blueprint, folder structures, and standards for our hybrid appShip high-quality, user-facing features across iOS and AndroidCollaborate closely with native iOS and Android developers to integrate and maintain native bridges, exposing core native capabilities (e.g., our custom audio engine) to the React Native layerOwn mobile features end-to-end: UI, API integration, release, and post-launch optimizationImprove app quality: Optimize React Native performance (startup time, memory usage, and frame rates)Stay adaptable: Participate in evaluating and prototyping other cross-platform or emerging technologies if our product direction evolves