Senior AI Agent Engineer （Java/Spring）

Skillhouse ·www.skillhouse.co.jp

Location Tokyo, Tokyo, Japan
Salary JPY 7,000,000 - 10,000,000 / year
Type Full time
Level Senior
Source Shazamme
Software/Web Development Both
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The Business Support Development Department at a global IT services company is seeking an AI Agent Engineer to design and develop AI systems capable of autonomously executing complex tasks. In this role, you will be at the forefront of developing intelligent agents that go beyond conventional chatbots by integrating with tools, APIs, and external environments to deliver real business value.

Responsibilities:
- Design and develop autonomous AI agents using Large Language Models (LLMs) and agent frameworks
- Implement tool-use capabilities (Function Calling) to enable integration with external systems and databases
- Optimize agent workflows to improve reasoning, planning, and task execution accuracy
- Evaluate and enhance agent performance through rigorous testing and prompt engineering

Required Skills:
- 7+ years of hands-on experience in web application design, code reviews, performance tuning, performance optimization, and architecture improvements
- 7+ years of practical experience in database schema design and application development involving integration with external systems
- 7+ years of extensive software development experience
- 7+ years of experience developing and operating large-scale systems using Java (Spring Boot)
- Hands-on experience with AI agent development frameworks such as LangChain, LlamaIndex, CrewAI, or Microsoft AutoGen
- Deep understanding of prompt engineering and Chain-of-Thought (CoT) reasoning techniques

Why should I apply:
- A long-term opportunity with the possibility of transitioning to a permanent full-time position
- The opportunity to work alongside international team members in a global environment
- Free breakfast, lunch, and dinner provided at the company cafeteria


Company Overview
A leading global technology and telecommunications company with operations worldwide. The company offers a diverse range of digital and technology-related businesses and continues to expand its global service ecosystem through ongoing investment in AI and digital transformation.

Working Hours: 9:00–17:30
Work Style: Hybrid
Holidays: Saturdays, Sundays, public holidays, and paid annual leave
Benefits: Standard social insurance and employee benefits package

Frequently asked questions

Who is hiring for the Senior AI Agent Engineer （Java/Spring） role?
Skillhouse is hiring for the Senior AI Agent Engineer （Java/Spring） position, a Shazamme client. Apply directly on the employer's career site.
Where is the Senior AI Agent Engineer （Java/Spring） job located?
The Senior AI Agent Engineer （Java/Spring） role with Skillhouse is based in Tokyo, JP.
What does the Senior AI Agent Engineer （Java/Spring） role pay?
Skillhouse lists the Senior AI Agent Engineer （Java/Spring） role at JPY 7,000,000–10,000,000 per year.
Is the Senior AI Agent Engineer （Java/Spring） role full-time or contract?
This is a full time position at Skillhouse.
What experience level is the Senior AI Agent Engineer （Java/Spring） role?
The Senior AI Agent Engineer （Java/Spring） position is aimed at senior-level candidates.
How do I apply for the Senior AI Agent Engineer （Java/Spring） role at Skillhouse?
Apply directly on Skillhouse's career page via the Apply button on this listing. ZammeJobs links straight through to the employer's ATS — no third-party form, no resume database.
Apply direct