Position: Full-Stack Engineer – AI-driven Development
Company: Confidential AI / Generative AI Solutions Company
Location: Tokyo, Japan (hybrid / remote within Japan depending on project)
Employment Type: Full-time
Overview
A Tokyo-based AI solutions company is seeking a Full-Stack Engineer to work on generative AI system development for both client projects and internal products. The organization operates across multiple domains including AI transformation, digital solutions, and product development, with a strong focus on practical implementation of generative AI technologies.
This role offers the opportunity to build real-world AI applications, including enterprise AI assistants and AI-powered SaaS features, within a fast-paced and globally collaborative engineering environment.
Position Summary
The Full-Stack Engineer will design and develop AI-powered web applications and systems, working across frontend and backend. The role involves prototyping, productionizing AI features, and collaborating closely with cross-functional teams to deliver scalable solutions.
Key Responsibilities
AI Application Development
Develop systems that enable enterprise use of generative AI
Build custom AI prototypes tailored to client use cases
Implement AI-powered features into SaaS products
Full-Stack Development
Design and develop frontend and backend web applications
Build scalable and maintainable system architectures
Collaborate across teams to deliver end-to-end solutions
AI & LLM Implementation
Select and integrate AI models for different use cases
Implement RAG, fine-tuning, and multimodal solutions
Improve model performance and output quality
Agile Development
Transition prototypes into production systems
Iterate quickly based on PoC results and feedback
Utilize modern AI development tools in coding and testing workflows
Qualifications
Required
3+ years of full-stack web development experience
Strong experience with TypeScript or JavaScript and React
Experience building both frontend and backend systems
Preferred
Experience developing or operating in-house services
Experience with cloud platforms (AWS, GCP, or Azure)
Experience leading development efforts (tech selection, code review, etc.)
Desired Profile
Strong interest in adopting and experimenting with new technologies
Comfortable working in a fast-paced, evolving environment
Ability to work independently in remote or distributed teams
Collaborative mindset with focus on team development
Technical Environment
Frontend
TypeScript, React
Backend
Python, Go, PHP
Frameworks
FastAPI, Flask, Laravel
Database
PostgreSQL, MySQL, Redis
Infrastructure
AWS, GCP, Azure, Docker, Terraform
Tools
GitHub Actions, AI-assisted development tools, collaboration platforms
Working Style & Benefits
Hybrid / remote work options (within Japan, depending on project requirements)
Flexible working hours (engineer roles may use flextime)
Standard hours: 9:00 – 18:00 (flexible adjustments available)
120+ annual holidays (weekends, national holidays, year-end holidays)
Paid leave, special leave, and parental leave programs
Full social insurance coverage
Commuting and family allowances
Company-provided equipment and office support
Learning and certification support programs
Access to internal AI tools and development platforms
Visa and language support available
Team & Culture
Global and diverse engineering team
Strong emphasis on practical AI implementation and delivery
Collaborative, fast-paced environment with a “build and learn” mindset
Opportunities to work across multiple AI-driven products and client projects
Compensation
7.2M – 12M JPY (depending on experience)
Career Path
Opportunity to specialize in AI / LLM application development
Growth into technical lead or AI architect roles
Exposure to diverse AI use cases across industries