Lead Backend Engineer

Date PostedSeptember 15, 2026LocationAsia Japan TokyoCompanyMichael Page International Japan K.K./マイケル・ペイジ・インターナショナル・ジャパン株式会社SalaryJPY 6000K - JPY 8000KTypeit (pc, web, unix) - back-end engineer

Job Summary

Join a leading large-scale digital commerce organization as a Senior Backend Engineer and Technical Lead to shape the architecture of mission-critical web platforms. This role combines hands-on technical leadership, system design, and operational excellence within a high-traffic environment. You will work with Java, Spring Boot, and modern cloud-native technologies to support future business growth.

Responsibilities

  • Lead backend architecture design and technical decision-making for large-scale web applications.
  • Drive end-to-end development including system design, implementation, testing, release, and operational support.
  • Develop and enhance RESTful APIs and backend services using Java and Spring Boot.
  • Monitor production environments, lead troubleshooting efforts, and manage incident reporting.

Required Skills

  • 5+ years of Technical Lead and architecture design experience
  • 5+ years of Java and Spring Boot development experience
  • 5+ years of REST API design and development experience
  • Experience with Docker, Kubernetes, Linux, Git, and Gradle
  • Business-level English communication skills

Job Details

Job Description Join a leading large-scale digital commerce organization as a Senior Backend Engineer and Technical Lead, shaping the architecture and future direction of mission-critical web platforms. This role combines hands-on technical leadership, system design, project ownership, and operational excellence within a high-traffic environment. Description * Lead backend architecture design and technical decision-making for large-scale web applications. * Understand business priorities and deliver high-quality solutions within challenging timelines. * Drive end-to-end development including system design, implementation, testing, release, and operational support. * Lead projects and provide technical guidance to engineering teams. * Design scalable and maintainable systems that support future business growth and feature expansion. * Monitor production environments, lead troubleshooting efforts, and manage incident reporting. * Develop and enhance RESTful APIs and backend services using Java and Spring Boot. * Conduct code reviews, promote engineering best practices, and maintain high software quality standards. * Collaborate with cross-functional stakeholders to ensure successful project delivery. * Support operational activities including investigations, inquiries, and platform maintenance. Profile Required Skills & Experience * 5+ years of Technical Lead experience, including architecture design for high-traffic web systems. * Proven experience leading scalable and maintainable system design initiatives. * Experience leading production monitoring, incident management, and troubleshooting activities. * 5+ years of Java and Spring Boot web application development experience. * 5+ years of REST API design and development experience. * Strong knowledge of JUnit testing and code review practices. * Experience with Oracle or MySQL databases. * Experience with Tomcat and/or WebLogic. * Proficiency in Linux, Git, and Gradle. * Experience implementing CI/CD using Jenkins or equivalent tools. * Hands-on experience with container technologies including Docker and Kubernetes. * Business-level English communication skills. Preferred Skills * Experience with performance, load, and stress testing. * Experience using Redis, Kafka, Elasticsearch, Grafana, and Kibana. * 3+ years of PHP application development experience using any framework. * Experience building Kubernetes environments. * CKA (Certified Kubernetes Administrator) or CKAD (Certified Kubernetes Application Developer) certification. Job Offer * Opportunity to lead the design of highly scalable e-commerce systems serving millions of users. * Exposure to complex architectural challenges and high-volume production environments. * Ownership of strategic technical initiatives with visible business impact. * International engineering environment with English-language collaboration.