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Senior Backend Engineer (Tech Lead) - Large-Scale E-commerce
| Location | Tokyo - 23 Wards |
| Job Type | Temporary |
| Salary | 6 million yen ~ 8 million yen |
Job Description
Join a leading e-commerce platform team in Tokyo to design and lead backend systems at massive scale. You will act as a senior technical leader, driving architecture, delivery, and operational excellence across high-traffic services.
Client Details
Our client is a major internet services company operating one of Japan's largest online marketplaces, serving tens of millions of users. The organization is known for running high-impact campaigns and continuously optimizing performance at scale.
Description
- Lead backend architecture design for large-scale, high-traffic web systems
- Translate business priorities into high-quality, timely system delivery
- Own end-to-end development lifecycle: design, implementation, testing, and release
- Drive technical decisions in complex, high-load environments
- Lead projects or teams as a senior engineer, ensuring best practices and delivery excellence
- Optimize backend systems for peak events and large traffic spikes
- Oversee service monitoring, incident response, and production troubleshooting
- Implement continuous improvement cycles (hypothesis → validation → analysis → systemization)
- Collaborate with cross-functional teams to enhance user-facing features
- Handle operational tasks including investigation and stakeholder inquiries
Job Offer
- Opportunity to lead backend architecture for a top-tier e-commerce platform
- Exposure to large-scale, high-traffic systems and complex challenges
- Collaborative, innovation-driven engineering culture
To apply online please click the 'Apply' button below. For a confidential discussion about this role please contact Serena Wu on +81 3 6627 6137.
General Requirements
| Minimum Experience Level | No experience |
| Career Level | Mid Career |
| Minimum English Level | Fluent |
| Minimum Japanese Level | Basic |
| Minimum Education Level | Bachelor's Degree |
| Visa Status | Permission to work in Japan required |
Required Skills
- 5+ years of technical leadership in high-load web system architecture and decision-making
- Proven experience designing scalable, maintainable systems with long-term growth in mind
- Strong background in Java and Spring Boot (5+ years)
- Extensive experience with REST API design and development
- Solid understanding of unit testing (JUnit) and code review practices
- Experience with relational databases (Oracle or MySQL)
- Familiarity with application servers (Tomcat or WebLogic)
- Strong command of Linux, Git, and Gradle
- Experience with CI/CD tools (e.g., Jenkins)
- Hands-on experience with container technologies such as Docker and Kubernetes
- Proven experience in production monitoring, incident handling, and reporting
- Business-level English communication skills
- Experience with performance, load, and stress testing
- Familiarity with Redis, Kafka, Elasticsearch, Grafana, Kibana
- PHP development experience using frameworks (3+ years)
- Kubernetes environment setup and certifications (CKA/CKAD preferred)
Job Location
- Tokyo - 23 Wards
Work Conditions
| Job Type | Temporary |
| Salary | 6 million yen ~ 8 million yen |
| Industry | Software |
