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AI Application Engineer, Artificial Intelligence Office - Travel Development Department

Tokyo, Japan💼 Full-time🗓 2025-12-22 → 2026-07-30

Core

Design, develop, and operate autonomous generative AI agents to support end users and accommodation partners in travel search, booking, and customer support.

Role type

Senior AI Application Engineer (Generative AI Agents)

Builds

Autonomous AI agents and agent orchestration platforms for Rakuten Travel

Domain

Online Travel Agency (OTA) / Generative AI / LLMs

Deliverable

production ML models | product features

Required skills

Generative AI agent development, LLM API integration, Model Context Protocol (MCP), RAG architecture design, automated evaluation frameworks, A/B testing, CI/CD pipelines, cloud infrastructure management

Preferred skills

Context engineering, cross-functional team leadership, DevOps/LLMOps practices, GCP experience

Technologies

OpenAI Agent SDK, Google ADK, OpenAI, Vertex AI, Azure OpenAI, Docker, MCP

Responsibilities

Design and develop AI agents for search, booking, and customer support; define functional requirements based on business needs; implement and improve AI agent platforms using LLM APIs; design context management via knowledge bases and RAG; build automated evaluation and test cases; own deployment, monitoring, and troubleshooting in production; establish development processes and provide technical leadership

Seniority

Senior, hands-on IC with project leadership

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