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Senior Backend Developer, Rakuten Ichiba - Mall Section No.1, EC Marketplace Development Department(ECMPD)

Collected Jul 27, 2026 · Last checked Oct 17, 2026

Job Details

Not stated

Tokyo

Full-time

Not stated

Not in this posting: salary, employer phone number

About This Role

Job Description

Department Overview

EC Marketplace Development Department (ECMPD) is a tech division under Rakuten Commerce & Marketing Company of Rakuten Group, Inc. We are responsible for developing and enhancing our online system to support our core business, Rakuten Ichiba.

Rakuten Ichiba is one of the largest internet shopping malls in Japan with 5.6 trillion sales in 2022 and our business is growing year on year. We aim to provide the best shopping entertainment for our shoppers and empower our partners in Rakuten Ichiba.

Position:

Why We Hire

While this service is growing steadily, we need a more robust and scalable system to drive further growth. We are also committed to providing the best user experience possible. This requires a stronger team and higher engineering skills, and we need more Backend engineers to work with us as part of our development team.

Position Details:

  • Define requirements, design, programming, testing, and deployment to deliver the system.
  • Collaborate with PDM, internal members, and upstream/downstream system teams.
  • Monitor system stability and performance, optimize performance, design and maintain system architectures, refactoring, optimization, and troubleshooting.

Mandatory Qualifications

・System Development & Operations: Experience in system development and operations using Java, Spring Framework, React, etc.

・Cloud & Container Experience: Experience in system design and operations using Kubernetes, Docker, AWS, etc.

・Architecture Leadership: Experience in overseeing entire systems and leading design and technical decision-making with consideration for layer structures, domain boundaries, maintainability, scalability, and availability.

・Performance Engineering: Experience in designing load tests based on system characteristics and identifying/improving bottlenecks across applications, middleware, caches, and databases.

・Reliability Engineering: Experience in predicting risks and failure factors in production environments, as well as leading analysis, problem-solving, root cause analysis (RCA), and recurrence prevention for major incidents.

・Business/Technical Translation: Experience in explaining technical issues in terms of business risks and growth opportunities to facilitate appropriate prioritization and decision-making.

・Problem-Solving Skills: Experience in structuring issues by working backward from business goals, and driving results by making flexible judgments and course corrections using hypotheses, even in uncertain situations.

・Global Communication: Ability to conduct technical discussions, design reviews, incident response, and stakeholder coordination in English.

Desired Qualifications

・Large-Scale Service Experience: Experience in the design, development, and operation of high-traffic or mission-critical services.

・EC Domain Experience: Development and operations experience in the commerce domain, such as EC, marketplaces, payments, orders, inventory, or search.

・Distributed Systems Experience: Experience in system design and operations using microservices, event-driven architecture, Kafka, etc.

・Database Design & Operations: Experience in the design, performance analysis, and tuning of PostgreSQL, MySQL, Oracle, etc.

・Observability Experience: Experience in system improvement utilizing Monitoring, Tracing, and Logging.

・AI Utilization Experience: Experience in improving development efficiency or developing services by utilizing generative AI or AI development support tools.

・Japanese Communication Skills: Ability to conduct technical discussions, organize requirements, coordinate with stakeholders, or create documentation in Japanese.

Others Information:

Additional information on English Qualification

TOEIC Score 800 or above

#engineer #applicationsengineer #commerce #RakutenIchiba

Languages:

English (Overall - 4 - Fluent)

Language Requirements

Daily English

Company

Rakuten Group

楽天グループ株式会社

Head Office: Tokyo

Internet / E-CommerceFinance & FinTech

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