Web Developer

  • Tokyo
  • No Remote
  • Full-time
  • July 29, 2025
Conditions
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¥4.2M ~ ¥11.62M /yr
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Apply from Japan Only
(You must live in Japan to apply)
Requirements
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Language Requirements
Japanese: Conversational
English: Not Required
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Minimum Experience
Mid-level or above

Responsibilities

Depending on your experience and interests, you will be responsible for the following tasks:

  • Design, development, and operation of mobile and web applications
  • Backend design and implementation
  • System and service development utilizing generative AI (RAG, etc.)
  • Requirements gathering and technical proposals with clients (based on preference)
  • UX improvement and UI design support in collaboration with designers
  • Technology selection, design policy formulation, and architecture design
  • Mentoring and technical support for team members
  • Scrum-based team development and continuous product improvement
  • Design/code reviews, knowledge sharing, and development process improvement
  • Future involvement in in-house product planning and development is also possible

 

Position Highlights

  • Experience with hybrid technology combining scratch development × low-code development
  • Challenge full-stack development with modern technology stack like Flutter/TypeScript
  • Direct involvement in technology selection and architecture design under CTO leadership
  • Fast decision-making and implementation speed in a small elite team with high autonomy
  • Environment where you can actively engage with cutting-edge areas like generative AI and RAG
  • Experience in 0→1 and 1→10 phases: Real experience of business growth from product creation to improvement

 

Recommended for:

  • Those who want to grow in a position involved in design and technology selection while pursuing technology
  • Those who want to approach development from a product perspective
  • Those who want to expand their skill range in a modern development environment
  • Those considering future involvement in lead engineering or in-house product launches

 

Development Environment

Frontend/Mobile:

  • FlutterFlow / Flutter / Dart
  • Next.js/React/TypeScript

 

Backend:

  • Supabase / PostgreSQL
  • TypeScript
  • Firebase

 

Source Control:

  • Github

 

Design:

  • Figma
  • Diagrams.net and others

 

Editor:

  • You can use your preferred editor

GenAi Inc. is a Tokyo-based company that provides IT consulting, system development, and media operations.

They offer tailored technology solutions to clients, supporting them from business strategy planning to implementation.

View GenAi's company page

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