Frontend Developer

1週間前


Tokyo 株式会社PeopleX アクティブコネクターグループ
Build the Frontend for Next-Generation AI Products in Tokyo
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.

[Job ID: 06462]

  • Not the right match?
We're actively hiring across multiple roles. If this position isn't the perfect fit, explore our other opportunities—we'd still love to hear from you
Show more Show less
  • Frontend Developer

    1週間前


    Tokyo 株式会社PeopleX アクティブコネクターグループ ¥6,000,000 - ¥12,000,000 per year

    Build the frontend for next-generation AI products.We're looking for a front-end engineer who's passionate about performance, user experience, and modern web technologies. · ...

  • Frontend Developer

    1ヶ月前


    Tokyo Zenport ¥600,000 - ¥1,800,000 per year

    We are looking for senior frontend engineers to accelerate product development. Our team is international, currently having members from 7 regions across the globe. As a senior engineer, leveraging your deep knowledge on technologies, you would be expected to manage challenges wi ...

  • 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 a hybrid work schedule and great perks like rent support and meal subsidies. You'll join a diverse global team driving AI innovation. · Working on Generative AI-powered SaaS products using TypeScript, Re ...

  • Frontend Developer

    1ヶ月前


    Tokyo Robert Half ¥4,000,000 - ¥8,000,000 per year

    Frontend Engineer (Web) for a fast-growing FinTech credit card company in Tokyo, Japan. Work on the web frontend for the credit card mini-application, focusing on making it smooth, fast, and easy to use. · Build new features working closely with Product Managers, Designers, and o ...


  • Tokyo Rakuten ¥4,000,000 - ¥12,000,000 per year

    Frontend Developer to work with our development team to drive further growth and provide the best user experience possible. · Development experience with JS, HTML, CSS for more than 3 years · Deep understanding of frontend performance optimization · Knowledge of Web security · Ex ...


  • Tokyo Rakuten Full time¥4,000,000 - ¥8,000,000 per year

    We are looking for a Frontend Developer to join our development team. The successful candidate will be responsible for defining requirements, designing, programming, testing, and deploying the system. They will also collaborate with PDM, internal members, and upstream/downstream ...


  • Tokyo Six Sigma Talent & Operations ¥10,000,000 - ¥15,000,000

    We are seeking a skilled Sr. Front-End Developer to join our growing product team. This role focuses on building sleek, scalable web interfaces using React, and TypeScript, with the opportunity to contribute to high-impact visual content tools. · Develop and maintain responsive, ...

  • Frontend Developer

    1ヶ月前


    Greater Tokyo Area Guha Edge Professional Consulting Services ¥4,000,000 - ¥8,000,000 per year

    We're looking for a talented Frontend Developer to join our team in Tokyo. In this role, you'll design, develop, and maintain high-performance web systems while collaborating closely with cross-functional teams to deliver robust, scalable, and secure applications. · Define requir ...

  • Frontend Developer

    2週間前


    Tokyo, Japan Bitcoin Devs Company ¥1,248,000 - ¥1,648,000 per year

    As a Frontend Developer you will play a crucial role in designing and implementing user interfaces for our web applications. · ...

  • Frontend Developer

    1ヶ月前


    Tokyo Zenport Inc. Remote job¥4,000,000 - ¥12,000,000 per year

    Senior frontend engineers to accelerate product development for global supply chain management SaaS. · 3+ years building web applications · 2+ years building React · 2+ years using TypeScript · 1+ year building GraphQL · Fluent in English · Manage challenges with the team to go o ...

  • Frontend Developer

    2ヶ月前


    Tokyo Build+ (formerly Wahl+Case) ¥4,000,000 - ¥12,000,000 per year

    Build cutting-edge Generative AI and LLM tech, creating SaaS products that change how people interact with AI. Work on real challenges like making apps faster, more scalable, and easier to use. · AI chat interface · Reusable UI component library · UX improvements · Library upgrad ...


  • Tokyo Rakuten ¥4,000,000 - ¥8,000,000 per year

    We are committed to providing the best user experience possible. This requires a stronger team and higher engineering skills, and we need more Frontend engineers to work with us as part of our development team. · Define requirements, design, programming, testing, and deployment t ...


  • Tokyo Appier ¥600,000 - ¥1,800,000 per year

    We are looking for a Senior Frontend Developer with strong technical expertise and a leadership mindset to join our frontend team. · Lead the frontend architecture in new projects and play an active role in key technical decisions · Contribute to defining and maintaining technica ...


  • Tokyo Six Sigma Talent & Operations ¥10,000,000 - ¥15,000,000 per year

    We are seeking a skilled Sr. Front-End Developer to join our growing product team. This role focuses on building sleek, scalable web interfaces using React, and TypeScript, with the opportunity to contribute to high-impact visual content tools. · Develop and maintain responsive, ...


  • Tokyo Rakuten Full time¥1,000,000 - ¥1,200,000 per year

    +Job Description: · FRSD focuses on business-critical initiatives across our products and platforms. · +Responsibilities: · - Understanding and using appropriate project management tools... · - Proactively communicating and coordinating with all internal and external stakeholders ...


  • Tokyo Rakuten ¥4,209,600 - ¥10,000,000 per year

    We are looking for a Project Manager to help drive forward our innovative products and solutions across backend and mobile. You'll play a key role in delivering technology in terms of planning and execution. · Understanding and using appropriate project management tools · Communi ...


  • Tokyo レバテック株式会社 ¥5,000,000 - ¥11,000,000 per year

    フルリモートで働くフロントエンドエンジニアを探しています。TypeScriptを用いたアプリケーションの開発・運用、チーム内外の技術的な課題発見・解決策の提案・実行などを行います。 · ビジネス~母国語レベルの日本語力 · TypeScript / を用いたプロダクト開発経験 · チームでのWebアプリケーション開発経験 · 開発言語: TypeScript · アーキテクチャ: CSR(SPA), React Hooks, SWR · 外部サービス: Vercel, Google Analytics, Google Tag Manager, GitHu ...

  • Frontend Engineer

    2ヶ月前


    Tokyo Relocate ¥600,000 - ¥1,800,000 per year

    We are looking for web frontend engineers to work on the PayPay Card mini-application, and other web frontend, with a laser focus on scalability and maintainability. · We want to reassess our frontend systems relevancy and update the architecture according to our product & techni ...


  • Tokyo ROYAL AGENT

    As a solution for improving labor productivity in an aging society with a declining birthrate, they are dedicated to creating a variety of services using their unique AI technology and AI platforms. · Planning, designing, and developing the entire system, including frontend, back ...

  • Frontend Engineer

    1ヶ月前


    Tokyo Hays ¥4,000,000 - ¥10,000,000 per year

    We are seeking a Lead Frontend Engineer skilled in both and (React) to join our diverse and fast-moving technology team. You will work on a variety of projects, from maintaining and improving existing applications to building new, high-performing interfaces for modern web pla ...

  • Full-stack Engineer

    1ヶ月前


    Tokyo NEX-GEN Corporation ¥400,000 - ¥1,200,000 per year

    Address technical debt in TIG and AICoE applications, Migrate each application to NPC2 environment, Develop and enhance web applications, Set up CI/CD pipelines for system migration, Collaborate with teams for both frontend and backend tasks. · ...