We're looking for a Front End Engineer who's passionate about performance, user experience, and modern web technologies. Join us in developing fast, beautiful, and scalable SaaS products powered by Generative AI.
Position:
Front End Engineer
Location:
Tokyo (Hybrid)
Salary:
¥6,000,000 – ¥12,000,000
Japanese:
Advanced
Why This Role Is Exciting
You'll own real impact. Your work directly shapes how users interact with AI-powered applications — from chat interfaces to entire product experiences.
You'll solve meaningful challenges. Improve performance, eliminate bottlenecks, and deliver seamless UX backed by data and monitoring tools.
You'll help define our frontend culture. From design systems to code quality standards, your contributions will influence how our team builds for years to come.
You'll work with a modern stack. TypeScript, React, , tRPC, Core Web Vitals optimization, Sentry monitoring — everything you need to build world-class UX.
You'll collaborate with talented, diverse teams. Designers, backend engineers, AI specialists — all working together to deliver high-impact products.
Key Responsibilities
Frontend Development
Build and enhance SaaS products using TypeScript, React,
Implement type-safe API communication using tRPC
Develop intuitive, high-performing AI chat interfaces
Create and maintain reusable UI component libraries
Drive frontend improvements for new features and UX enhancements
Quality & Performance Optimization
Monitor and resolve frontend errors (e.g., via Sentry)
Continuously improve Core Web Vitals
Optimize bundle size & implement code splitting
Maintain libraries, upgrade versions, and introduce productivity tools
Collaboration & Processes
Work with designers on UI/UX
Coordinate API specs with backend engineers
Propose enhancements to CI/CD pipelines
Promote code quality through reviews and documentation
Team Structure
You will join the In-House AI SaaS Development Group within a 65-member engineering organization divided into:
Client Solutions Development
In-House AI SaaS Product Development
Common Infrastructure (Infra / Data / AI R&D)
Must-Have Qualifications
3+ years of frontend development experience
Professional experience with React and
Strong TypeScript and type-safe coding skills
Experience improving code quality and performance
Proficiency with Git/GitHub in a PR-based workflow
Experience writing unit & integration tests
Hands-on experience with cloud platforms (AWS/GCP/Azure) and Docker/Kubernetes
Japanese proficiency - N2 level or higher (able to conduct interviews and perform tasks in Japanese)
If you're passionate about building beautiful, high-performance frontends and want to create real impact with AI-driven products — we'd love to meet you.
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