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Job ID : 1602240 Date Updated : July 10th, 2026
世界を動かすECプラットフォームへ。英語環境で挑む、カート・決済API開発リード

【大手IT・EC企業】シニアアプリケーションエンジニア|SRE・Web API開発(派遣)

Location Tokyo - 23 Wards
Job Type Permanent Full-time
Salary Negotiable, based on experience

Work Style

Casual Clothing Minimal Overtime

Job Description

国内最大級のECサービスを展開する大手IT・EC企業にて、英語を中心としたグローバル開発環境で、ショッピングカート・チェックアウトプラットフォームを支えるWeb APIの設計・開発・運用をリードいただきます。

複数名のエンジニアチームを技術面で牽引し、基本設計、アーキテクチャ設計、コードレビュー、システム改善まで幅広く担当いただくポジションです。

高可用性・高負荷環境において、SRE、クラウドネイティブ技術、DevOpsプラクティスを活用しながら、数百万規模のトランザクションを処理するミッションクリティカルなシステムの信頼性向上に携わっていただきます。



主な職務内容

  • 複数名のエンジニアチームの技術リード、コードレビュー、技術指導
  • ショッピングカート・チェックアウトシステム向けRESTful Web APIの設計・開発・運用
  • SREの観点から、システムの可用性・信頼性向上に向けた運用改善
  • ミドルウェアやクラウド環境の最適化、高可用性アーキテクチャの設計
  • 負荷試験、パフォーマンス分析、キャパシティプランニングの実施
  • 本番障害発生時のトラブルシューティング、Root Cause Analysisのリード
  • CI/CDパイプラインの改善、自動化、ソースコード管理の推進
  • 開発・運用プロセスの継続的な改善およびDevOps文化の推進

Join one of the world's leading technology and e-commerce companies as a Senior Java Application Engineer / Design Lead within the Checkout System Group. In this technical leadership role, you will lead the development, optimization, and reliability of the mission-critical APIs that power one of the world's largest online shopping and checkout platforms.

Working in a highly collaborative Site Reliability Engineering (SRE) environment, you will take ownership of the complete software development lifecycle-from architecture and basic design to production operations, performance engineering, capacity planning, and cloud platform optimization. This is an exceptional opportunity for experienced Java engineers who enjoy solving large-scale technical challenges and building highly available, enterprise-grade systems.



Key Responsibilities

  • Lead and mentor a team of engineers, promoting engineering excellence, coding standards, and technical best practices.
  • Design, develop, and maintain scalable, high-performance RESTful APIs supporting large-scale e-commerce checkout platforms.
  • Drive Site Reliability Engineering (SRE) initiatives to improve platform stability, observability, availability, and operational efficiency.
  • Design and optimize cloud-native architectures, middleware, and enterprise application platforms.
  • Perform load testing, performance tuning, capacity planning, and scalability improvements to support millions of daily transactions.
  • Lead production incident response, root cause analysis, and continuous service improvement activities.
  • Build and improve CI/CD pipelines, deployment automation, and source code management processes.
  • Collaborate closely with cross-functional engineering teams to deliver reliable and secure enterprise applications.




General Requirements

Minimum Experience Level Over 3 years
Career Level Mid Career
Minimum English Level Business Level
Minimum Japanese Level Basic
Minimum Education Level Bachelor's Degree
Visa Status Permission to work in Japan required

Required Skills

必須条件 経験・資格:

  • Javaを用いたWebアプリケーション開発経験(5年以上)
  • RESTful Web APIの設計・開発経験
  • 大規模Webサービスの運用経験、および本番障害対応・トラブルシューティング経験
  • ソフトウェア開発ライフサイクル(SDLC)に関する幅広い知識
  • DevOps環境での開発・運用経験
ソフトスキル:
  • エンジニアチームをリードし、技術的な意思決定を推進できるリーダーシップ
  • 高品質かつ保守性・拡張性を考慮したシステム設計能力
  • 高い分析力、課題解決能力、論理的思考力
  • 関係部署と円滑に連携できるコミュニケーション能力
語学力:
  • 日本語:日常会話レベル
  • 英語:ビジネスレベル以上
歓迎条件
  • Jenkinsなどを用いた運用自動化・CI/CD環境の構築経験
  • モニタリング・Observability基盤の設計・構築経験
  • Docker、Kubernetesなどコンテナ技術の利用経験
  • RDB、KVS、NoSQLを活用したシステムアーキテクチャ設計経験
  • クラウドネイティブ環境におけるシステム設計・運用経験
Required Skills and QualificationsExperience:
  • 5+ years of hands-on Java software development experience.
  • Proven experience designing and developing RESTful Web APIs and enterprise web applications.
  • Strong experience operating and supporting large-scale production systems in high-availability environments.
  • Comprehensive understanding of the Software Development Life Cycle (SDLC), including architecture, design, testing, deployment, and operational support.
  • Experience working within DevOps and Site Reliability Engineering (SRE) environments.
  • Experience troubleshooting production incidents and performing root cause analysis.
  • Strong understanding of cloud-native application development and enterprise software architecture.
Soft Skills:
  • Proven leadership experience managing or mentoring engineering teams.
  • Excellent communication and stakeholder management skills.
  • Strong analytical thinking and advanced problem-solving abilities.
  • Proactive mindset with the ability to design scalable and maintainable software solutions.
  • Ability to work effectively within fast-paced, highly collaborative Agile development environments.
  • Passion for continuous improvement, automation, and engineering excellence.
Language Requirements:

Japanese: Basic Level

English: Business Level

Preferred Skills & Qualifications
  • Experience building automation tools using Jenkins or similar CI/CD platforms.
  • Experience implementing monitoring, logging, and observability solutions.
  • Hands-on experience with Docker, Kubernetes, and containerized application platforms.
  • Knowledge of relational databases (RDBMS), Key-Value Stores (KVS), and NoSQL database technologies.
  • Experience with cloud infrastructure, distributed systems, and microservices architecture.
  • Experience supporting high-traffic e-commerce or online platform environments.

Job Location

  • Tokyo - 23 Wards

Work Conditions

Job Type Permanent Full-time
Salary Negotiable, based on experience
Industry Bank, Trust Bank

Job Category