Frontend Developer

2ヶ月前


Tokyo ビルドプラス(旧ウォールアンドケース) ¥5,000,000 - ¥10,000,000 per year
This is an exclusive frontend engineer role at a AI company.


The role offers up to 12M JPY/year (negotiable) plus RSU options, with a hybrid work schedule and great perks like rent support and meal subsidies.

You'll join a diverse global team driving AI innovation.

They're focused on cutting-edge Generative AI and LLM tech, creating SaaS products that change how people interact with AI.

So, you won't just be coding, you'll be shaping tools that users rely on every day, from chat interfaces to intelligent productivity features.

If you're interested in shaping product performance and UX, this could be a great fit


In this role, you'd be:
Working on Generative AI-powered SaaS products using TypeScript, React, , and tRPC

Areas of focus:
AI chat interface
Reusable UI component library
UX improvements
Library upgrades and maintenance
Introduce new dev tools for productivity
Monitor and improve Core Web Vitals
Optimize bundle size, code splitting


Why it's exciting:
You get to work on real challenges like making apps faster, more scalable, and easier to use.

Use a modern tech stack (TypeScript, React, , GCP, Kubernetes) and build products that actually use AI models like ChatGPT, Claude, and Gemini.

Be part of an international team, bringing a global perspective to products made in Japan.

They're a startup with fast decision-making, room to try new technologies, less bureaucracy, but also backed by their parent company (a listed company), with financial stability and long-term vision.

Your work is visible and impactful, since you're building SaaS products (AI chat, agents, transcription, marketing tools) that customers use right away.

Office is in Nishi Shinjuku with a flextime and hybrid schedule.


The ideal candidate has:
Strong experience with React, , TypeScript
Knowledge of testing, refactoring, CI/CD, and cloud/container platforms (AWS, GCP, Azure, Docker, K8s)
Business-level Japanese and English
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