Senior AI Agent Engineer - AI Agent Development Section, Business Support Development Department (BSD)

Role summary

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Rakuten is seeking a Senior AI Agent Engineer to design, develop, and improve AI-agent capabilities for internal business-support services. The role is expected to involve large language models, generative AI, retrieval-augmented generation, agent workflows, APIs, and production software development. Candidates should have strong experience in Python or comparable languages, machine-learning or natural-language-processing systems, cloud technologies, and software architecture. Practical knowledge of prompt engineering, evaluation, monitoring, security, and responsible AI is valuable. The successful candidate should be comfortable translating business needs into reliable technical solutions, collaborating with product and engineering teams, mentoring colleagues, and taking ownership from experimentation through deployment.

About the employer

Rakuten Group is a major Japanese technology and internet company headquartered in Tokyo. Founded in 1997, it operates a broad ecosystem spanning e-commerce, fintech, mobile communications, digital content, travel, advertising, and professional services. Its membership and loyalty platform connects many of these businesses, allowing customers to earn and use Rakuten Points across services. Rakuten is also an active investor in cloud technology, artificial intelligence, data platforms, and digital transformation. The company has an international workforce and works in English in many technology and corporate teams, although Japanese remains important for some roles and everyday life. Employees may find opportunities to work on large-scale consumer products as well as internal platforms supporting Rakuten’s global business operations.