Full-stack AI Engineer

Date PostedMay 21, 2026LocationTokyo / Osaka, JapanCompanyTopTech Informatics K.K / トップテックインフォマーティックス株式会社SalaryJPY 5500K - JPY 11000KTypeit (pc, web, unix) - fullstack engineer it (pc, web, unix) - web application se it (pc, web, unix) - back-end engineer

Job Summary

You will be responsible for end-to-end development of a new AI-native B2B SaaS product. This role involves building scalable backend architectures and designing next-generation UIs from scratch (0-to-1). You will collaborate within an agile team to implement advanced AI functions and solve complex back-office challenges.

Responsibilities

Design and implement scalable backend architecture using Go
Develop AI-integrated UI/UX using TypeScript, React, or Vue
Lead 0-to-1 product development and technology selection
Optimize API performance and manage large-scale data systems

Required Skills

5+ years of web application development
Proficiency in Go or TypeScript
Experience with React or Vue
Knowledge of microservices and distributed systems
Interest in AI/ML/LLM technologies

Job Details

### Job Description & Responsibilities In this position, you will be responsible for all aspects of development as a full-stack engineer for a newly launched AI-native B2B SaaS product. #### Backend Development - Scalable architecture design and implementation (Go expected) - Building infrastructure to handle large-scale data (over 1 million records) - API design and performance optimization #### Frontend Development - UI/UX development using TypeScript (React / Vue) - Next-generation interface development utilizing AI functions - Screen design and implementation with user experience in mind #### Product Development - Developing a new product from scratch (0 to 1) - Involvement in technology selection and architecture design - Agile development in collaboration with the team ### Job Requirements #### Required Qualifications - Web application development experience (5+ years) - Practical experience in backend or frontend development - Interest in and motivation for new product development #### Preferred Qualifications - Practical experience with Go or TypeScript - Frontend development experience using React/Vue - Knowledge of microservices/distributed systems - Interest in and experience with AI/machine learning/LLM - Interest in architecture design ### Working Conditions - Working Hours: 9:00 AM - 6:00 PM (60-minute break) - Flexible working hours (adjustable by 1 hour before or after) - Partial remote work available (every Wednesday) - Full-time employment (6-month probationary period)