AI Engineer - Full Remote

AI Engineer 📍 Tokyo, Japan

(Full Remote work available within Japan) 💰 ¥8.0M–¥18.0M annually

A technology company developing talent intelligence and HR SaaS products is looking for an AI Engineer to lead the development of autonomous AI agent capabilities.

As the company expands into a multi-product platform, you will play a key role in integrating generative AI and Large Language Models (LLMs) into both existing services and new products. You will work directly on building AI agent products, taking new features from early exploration and prototyping through to validation and production implementation.

This is a great fit for an engineer who wants hands-on ownership of practical AI agent architecture while working within a flexible, modern engineering environment.

What You'll Do

• Design, prototype, validate, and implement AI agent products and autonomous agent features
• Improve product accuracy and overall performance using Large Language Models (LLMs)
• Research and apply emerging generative AI technologies to drive new product development
• Build and maintain scalable web applications and backend services supporting AI capabilities
• Collaborate within a cross-functional engineering environment using modern CI/CD and cloud infrastructure

What We're Looking For

• 3+ years of experience in designing and developing web applications
• Experience with object-oriented design and development
• Solid understanding of LLMs, AI agent mechanisms, and their practical applications
• Business-level or fluent proficiency in Japanese
• Intermediate proficiency in English

Tech Stack

• Languages: Go, Python, JavaScript, TypeScript
• Frameworks & Libraries: Gin, FastAPI, Strands Agents, React, Next.js, Jotai, TanStack Query, React Hooks, gRPC, Protocol Buffers
• Infrastructure & DevOps: AWS (EC2, RDS, S3, CloudFront, Step Functions, ECS, Fargate, ECR, Systems Manager, EventBridge, Global Accelerator), Terraform, Docker / Rancher Desktop, GitLab CI, CloudWatch
• Tools: GitHub Copilot, Claude Code, Storybook, Figma, JIRA, Confluence

Why Consider This Opportunity?

• Flexible Work Style: Hybrid setup allowing remote work from home within Japan, paired with super-flex hours (no core time) and flexible break options ("switch work")
• Modern AI Tooling: Direct access to AI-assisted development tools like Claude Code and GitHub Copilot, alongside active work with LLM and agent frameworks
• Continuous Learning: Internal employee-led study sessions and structured training programs
• Career & Work Flexibility: Support for side jobs/dual employment and an internal transfer system allowing engineers to express interest in other teams

We have more opportunities available across different roles. If this position isn't the right fit for you, we'd still love to hear from you. Feel free to apply, and we can explore other opportunities that may match your experience and career goals.

Job ID: 06342