1 day ago
Tokyo, JapanSenior
Responsibilities
- Build backend services for conversational and autonomous commerce agents, including intent understanding, multi-turn execution, tool orchestration, and human confirmation checkpoints.
- Develop the commerce tool layer for catalog, inventory, pricing, cart, checkout, order status, and returns with strict contracts, authorization scoping, and blast-radius limits.
- Implement live-catalog grounding, retrieval, attribute and variant normalization, price and stock freshness, and product availability safeguards.
- Design transactional safety mechanisms including idempotency, confirmation, rollback, spend and scope limits, permissions, and audit trails.
- Build evaluation and observability systems for commerce outcomes, tracing, regression gates, and production quality metrics.
- Optimize retrieval and tool-call latency, model routing, prompt caching, and cost per resolved task.
- Partner with commerce product, search and recommendation, merchant platform, and trust and safety teams to launch agents in production.
Requirements
- More than 5 years of experience building and operating production backend services.
- Strong Python skills; Go or Java experience is a plus.
- Experience developing production ML-based systems in search, recommendations, advertising ranking, personalization, or fraud and risk.
- Experience with high-traffic transactional or e-commerce backends such as catalog, inventory, cart and checkout, payments, or order management.
- Track record of improving quality using offline evaluation and online A/B testing.
- Strong distributed-systems fundamentals, including asynchronous and event-driven architecture, queues, concurrency, idempotency, and distributed tracing.
- Hands-on experience shipping LLM-backed systems to production and direct experience with agentic patterns such as tool or function calling, orchestration frameworks, and multi-turn state management.
- Experience with cloud and containerized deployment, Kubernetes, CI/CD, and infrastructure as code.
Tech Stack
Categories
About Rakuten
Rakuten Group builds e-commerce marketplaces, financial services (credit cards, payments, banking, securities), and digital/communications offerings for consumers and merchants worldwide. It monetizes through transaction fees, financial services income, advertising, and mobile subscriptions; flagship businesses include Rakuten Ichiba, Rakuten Card, and Rakuten Mobile. Founded in 1997 and headquartered in Setagaya, Tokyo, the company is publicly listed on the Tokyo Stock Exchange and operates across many countries and regions.