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Senior Java Engineer - Own High-Traffic Checkout APIs (Tokyo)

東京23区 派遣社員 年収 600万円 - 800万円 外資系企業 求人詳細を見る
Join a backend-focused team responsible for critical checkout services, including order data creation and cart data persistence. You will lead design through operations for high-traffic Java-based APIs, consumers, and batch systems that power a large online marketplace.
  • Build mission-critical checkout systems at massive scale
  • Long-term contract with senior ownership and technical leadership

企業情報

Our client is a major Japan-based e-commerce marketplace operating large-scale online transaction platforms. The organization runs high-availability, high-throughput checkout and cart systems where reliability, ownership, and operational excellence are essential.

職務内容

  • Lead basic design (high-level design) aligned with business requirements for checkout-related backend services
  • Design, develop, test, and release RESTful Web APIs and supporting services (Consumer / Batch)
  • Own production operations, including monitoring, incident response, root-cause analysis, and troubleshooting
  • Drive engineering best practices across the SDLC: coding standards, code reviews, source control, build pipelines, testing, and release management
  • Collaborate proactively with Product and QA to clarify requirements, manage quality, and ensure smooth delivery
  • Provide senior-level guidance and leadership to other engineers, improving maintainability, performance, and reliability
  • Continuously enhance system stability and technical debt management in a mission-critical domain (checkout/cart)



理想の人材

Must-have

  • 5+ years of Java EE development experience (senior/full-stack engineering background)
  • Hands-on experience building and operating RESTful APIs
  • Experience supporting large-scale online systems, including production incident handling
  • Strong SDLC expertise: code standards, reviews, source management, build processes, testing, operations
  • Proven ability to design and deliver high-performance, reliable, maintainable code autonomously
  • Senior-level leadership: proactive communication with QA/Product, and ability to lead projects/engineers

Nice-to-have

  • Data design/development experience with RDB / KVS / NoSQL
  • Spring Framework experience
  • Containerization experience (e.g., Docker)
  • Experience with CI/CD, and observability tools (e.g., Grafana)
  • Interest or experience using AI to improve the development lifecycle (e.g., productivity, quality, automation)


Language

  • Japanese: Not required
  • English: Conversational level (e.g., TOEIC ~600 equivalent)

条件・待遇

  • Work on one of the most critical domains in e-commerce: checkout/cart, where impact is immediate and measurable
  • High ownership role with exposure to design, delivery, and production operations end-to-end
  • Collaborative environment with cross-functional stakeholders (Product/QA/Engineering)



コンタクト
Serena Wu
求人番号
JN-052026-7019832
電話
+81 3 6627 6137

求人情報

分野
IT
職種
プログラミング＆開発
業界
IT・通信
勤務地
東京23区
雇用形態
派遣社員
担当コンサルタント
Serena Wu
担当コンサルタントの電話番号
+81 3 6627 6137
求人番号
JN-052026-7019832
企業タイプ
外資系企業

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