Save Job Back to Search Job Description Summary Similar JobsDesign and lead Java systems used by millionsOwn architecture decisions in high‑traffic environmentsAbout Our ClientOur client is a large‑scale consumer e‑commerce platform serving tens of millions of users nationwide. The service operates under extreme traffic peaks during major campaigns and continuously improves through data‑driven analysis, experimentation, and backend optimisation.Job DescriptionUnderstand business priorities and deliver high‑quality Java services within tight schedulesLead architecture design and technical decision‑making for high‑traffic Java web systemsTake ownership of system design, development, testing, release, and long‑term operationAct as a senior engineer leading projects or small engineering teams end‑to‑endDesign, develop, and enhance Java/Spring Boot backend services and REST APIsDrive scalability, maintainability, and future system evolutionSupport production operations including investigations, inquiries, and incident handlingLead service monitoring, troubleshooting, and post‑incident reportingThe Successful Applicant5+ years of experience as a Technical Lead or Senior Java EngineerStrong experience designing high‑traffic, large‑scale Java web architecturesProven ability to lead system design with scalability and maintainability in mind5+ years of Java and Spring Boot web application development experience5+ years of REST API design and development, with solid JUnit testing and code reviewExperience with relational databases (Oracle or MySQL)Hands‑on experience with Tomcat or WebLogicStrong working knowledge of Linux, Git, and GradleExperience implementing CI/CD pipelines using Jenkins or similar toolsPractical experience with container technologies such as Docker and KubernetesExperience with service monitoring and production troubleshootingBusiness‑level English communication skills (e.g. TOEIC 800 or equivalent)Japanese language skills are not requiredPreferred skills:Experience with performance, load, or stress testingExperience using Redis, Kafka, Elasticsearch, Grafana, or Kibana3+ years of PHP application development using any frameworkExperience building environments using KubernetesKubernetes certifications (CKA or CKAD)What's on OfferWeekends and public holidays offExposure to mission‑critical systems operating at national scaleA technically demanding environment that values strong Java engineering leadershipTokyo‑based role within a globally‑oriented engineering organisationContactSerena WuQuote job refJN-042026-7001882Phone number+81 3 6627 6137Job summaryFunctionITSpecialisationProgramming / DevelopmentSpecialisationRetailLocationTokyo 23 WardsJob TypeTemporaryConsultant nameSerena WuConsultant phone+81 3 6627 6137Job ReferenceJN-042026-7001882Company TypeForeign Multinational
