Lead Frontend Product Engineer

Team: Product Development - Systems & Apps

Location: Tokyo

Commitment: Full-time employee /Full-time Contract

Workplace Type: hybrid

Leadership & Ownership

• Technical Strategy: Establish the architectural foundation for the new frontend application, making pragmatic choices that ensure maintainability and future scalability.
• Team Mentorship: Act as a player-coach, actively writing code while mentoring engineers through code reviews, pair programming, and technical guidance.
• Product Delivery: Lead the end-to-end delivery lifecycle—from requirement definition and design review to implementation, release, and post-deployment monitoring.
• Cross-Functional Collaboration: Partner with backend (.NET), design, robotics, and operations teams to ensure high-quality, integrated user experiences.

Technical Execution & Architecture

• Core Development: Design and implement complex frontend features using TypeScript and modern React, setting the standard for code quality.
• Architecture Evolution: Evolve application architecture, focusing on state management, routing, performance tuning, and error handling.
• API Integration: Architect robust integration patterns with backend services via REST and gRPC.
• Multi-Platform Strategy: Support delivery across multiple targets (Web, WebView-based mobile apps).
• Reliability & Ops: Ensure system reliability through comprehensive instrumentation (logging, metrics, error tracking) and lead incident resolution.

Continuous Improvement

• Tech Radar: Stay current with emerging frontend technologies and propose platform improvements.
• Process Optimization: Contribute to a culture of continuous learning, refining agile workflows and CI/CD processes.

Requirements - Must-Have

• 7+ years of professional experience as a software engineer.
• 5+ years of hands-on experience with TypeScript and React.
• 3+ years of experience developing applications for real users, including release and operation phases.
• Experience in team development using Git with 5 or more engineers.
• Experience mentoring engineering team members.
• Experience participating in technical decision-making.
• Experience collaborating closely with business and design teams.
• Experience developing WebView-based mobile applications.
• Ability to communicate effectively in English.
• Willingness or ability to understand Japanese documentation and context (input is often in Japanese).

Requirements - Nice-to-Have

• Experience working in both early-stage startups and established large-scale organizations.
• Experience with frontend observability (error logs, performance metrics, user flow instrumentation).
• Experience with automated testing tools (Jest, Testing Library, Cypress, Playwright).
• Experience in robotics, IoT, or dashboards requiring real-time telemetry.
• Ability to communicate in Japanese.
• Experience with .NET/C# backend development.
• Experience with Blazor.

Soft Skills & Behaviors

• Balanced Mindset: You understand the trade-off between startup agility and the reliability required for enterprise systems. You can drive uncertain products to launch while ensuring stability through pragmatic quality practices.
• Self-Managed & Resilient: You excel in unstructured environments with shifting business requirements, managing your own tasks and stress levels effectively.
• Communication Bridge: You can explain technical trade-offs to non-engineering members and propose alternatives in plain language.
• Clarifier: Comfortable leading ambiguous discussions and forming clarity from rough requirements.
• Team Builder: Invested in developing the skills and productivity of the frontend team through mentoring and process improvements.
• Collaborative Owner: Low-ego, proactive, and solution-oriented; you take initiative to identify problems and drive them to completion.