CareerPlanSign in

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

Tokyo, Japan💼 Full-time🗓 2026-08-13 → 2026-09-26

Core

Design and deploy advanced machine learning models and LLM-based agents to automate and optimize merchant communication, unifying fragmented services into a single cohesive interface.

Role type

Senior IC data scientist (AI agent development)

Builds

RAG systems, LLM-based agents, and unified merchant communication interfaces

Domain

E-commerce, AI agents, large-scale B2B SaaS

Deliverable

production ML models | product features

Required skills

Python, deep learning frameworks (PyTorch, TensorFlow), LLMs, prompt engineering, fine-tuning, RAG systems, data analysis, model evaluation

Preferred skills

end-to-end AI agent systems, conversational AI platforms, team leadership, MLOps, cloud infrastructure (GCP, AWS), E-commerce domain expertise

Technologies

PyTorch, TensorFlow, RAG, LLMs

Responsibilities

Design and deploy machine learning models and LLM-based agents; Develop RAG systems for context-aware responses; Analyze large-scale transactional and behavioral data; Integrate AI capabilities into the unified merchant interface; Mentor junior data scientists and establish best practices

Seniority

Senior, hands-on IC with mentorship responsibilities

Sourced via workday · Listed on CareerPlan, which tracks 70,000+ jobs from 20+ sources.