ITの開発の求人

Develop and maintain high-performance backend microservices for an e-commerce platform, building new features and services that enhance customer value while handling large-scale traffic and data volumes. Collaborate with engineering teams to improve productivity, drive system ownership, and promote a culture of innovation, quality, and reliable service delivery.

This role focuses on developing and operating front-end services for a large-scale online marketplace used by a broad consumer base. You will contribute across the full development lifecycle while improving performance, quality, and user experience.

This role leads front-end basic design and technical decision-making for a large-scale consumer e-commerce marketplace used by millions. You'll translate UI/UX vision into performant, maintainable React/TypeScript experiences while driving reliability, monitoring, and continuous improvement.

Join a global-scale payment platform team as a senior, hands-on engineer who leads basic design and delivers production-grade Java services end-to-end. You'll bridge architectural intent and day-to-day implementation, raising engineering quality through clear guidelines, strong reviews, and practical mentorship.

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.

We are seeking a talented iOS Developer to join a fast-paced retail technology team in Tokyo. This temporary role offers a unique opportunity to work on cutting-edge mobile applications in a dynamic and innovative environment.

This role is for a Senior Backend Engineer responsible for designing, developing, and operating high-scale APIs and backend systems that handle critical cart and order data.

You will lead technical efforts, ensure system reliability, and collaborate across functions to deliver high-performance, maintainable solutions.

This role focuses on developing and enhancing mission‑criticalmission‑critical trading and portfolio management systems using modern C++. You will collaborate closely with quantitative and trading teams in a fully English‑speakingEnglish‑speaking workplace, with no Japanese language requirement

生成AIを活用したエンタープライズ向けプロダクトの開発において、リードエンジニアとして機能設計から実装、改善までを担うポジションです。未成熟な業務領域を対象に顧客理解を深めながら、RAGや検索基盤の構築など高度な技術領域にも対応、プロダクトの初期成長を技術面から牽引し、価値創出の最大化を目指します。

Join an innovative team as a Software Engineer/Data Engineer, where you will design and implement data solutions to support technological advancements in the Technology & Telecoms industry. This position, based in Tokyo, offers an exciting opportunity to work on cutting-edge projects in a collaborative environment.

Design, build, and maintain scalable full-stack applications while ensuring high code quality, robust architecture, and adherence to modern development best practices. Lead technical initiatives, contribute to system design, and drive Agile delivery across cloud-native and event-driven environments.

国内外で展開する大規模ECモバイルアプリの開発・運用を担当。
ユーザー体験向上と技術革新を両立しながら、グローバル展開を支えるポジション。

全社のAI活用を推進し、業務改善からプロダクト価値向上までを横断的にリードするポジションです。

生成AIやLLMを活用した施策の企画・実行・検証を行いながら、事業成長に直結するAI活用基盤を構築します。

AWS・Azureを中心としたクラウド基盤の設計・構築、オンプレミスからクラウドへの移行、クラウドネイティブアーキテクチャの導入などを担うクラウドエンジニアポジションです。

上流から下流まで一気通貫でプロジェクトに関わり、IaC、自動化、監視、セキュリティ設計、DevSecOps推進まで幅広くリードいただきます。

大規模Webサービスの開発組織において、技術リードとしてアーキテクチャ設計や技術戦略の立案を担います。
新機能開発から基盤改善、技術的負債の解消まで幅広く関与、事業成長を支える高品質なシステム構築を推進し、チーム横断での技術課題解決やメンバー育成を通じて、組織全体の技術力向上にも貢献します。

Join a forward-thinking retail technology department as an iOS Developer, where you'll contribute to designing and developing innovative mobile applications. This temporary position in Tokyo offers an exciting opportunity to showcase your expertise in iOS development while working on impactful projects.

This is an exciting opportunity for a skilled Java Developer to contribute to innovative projects in the technology and telecoms industry. Based in Tokyo, the role requires expertise in Java programming and fluency in both Japanese and English to collaborate effectively across teams.

全社横断でフロントエンド領域の技術標準化と基盤構築をリードしながら、各プロダクトの開発・改善を牽引するテックリードポジションです。

React/Next.jsを中心としたモダン環境で、UI/UX・アーキテクチャ設計・AI活用開発プロセスの整備まで担います。

This is an exciting opportunity to contribute to innovative projects in the Technology & Telecoms industry. Based in Tokyo, the role focuses on creating seamless user interfaces and enhancing user experiences.

このポジションでは、Javaを使用したソフトウェア開発に携わり、プロジェクトの成功に貢献していただきます。バイリンガルスキルを活かし、グローバルな環境で活躍したい方に最適です。

We are seeking a highly skilled Senior Java professional to join a leading financial services company in Tokyo. The ideal candidate will leverage their technical expertise to deliver innovative solutions within the technology department.

This role leads the design, development, and operation of large‑scale Java‑based systems powering a major e‑commerce marketplace in Japan. You will drive technical decisions, ensure platform scalability and stability, and provide senior‑level leadership across projects and teams.

顧客企業のデータを活用し、課題定義から機械学習モデルの設計・実装・運用まで一気通貫で推進します。個別プロジェクトで得られた知見を横断的に整理し、再利用可能なAIソリューションやプロダクトへと昇華、また分析力とビジネス理解を掛け合わせ、継続的な価値創出と事業貢献を実現します。

This role leads the design, development, and optimization of frontend systems for a large-scale online marketplace used by tens of millions of users. You will combine hands-on engineering with technical leadership to deliver high-performance, reliable, and user-centric web experiences.

This role leads detailed design and backend development for applications supporting a large-scale data platform. You will combine hands-on engineering with technical leadership, influencing architecture and long-term product direction.

生成AIプロダクトの開発を担うフルスタックエンジニアとして、プロダクトの成長と新規開発の両面に携わっていただきます。

スタートアップフェーズの環境で、幅広い技術領域を横断しながら、グローバルチームとともにプロダクト価値向上を推進します。

This role focuses on building and evolving the core systems that support investment strategies. You will work hands-on with Java and Python in close collaboration with investment and trading professionals.

Data‑focused software engineering role centered on Python backend development, with NumPy and pandas as core, day‑to‑day requirements for data processing and analysis. The position also involves basic frontend work to support user‑facing features, making it ideal for someone comfortable working across backend, data, and light frontend layers.

• エンタープライズ向けのWebアプリ開発において、アーキテクチャ設計から実装・改善までをリードするポジションです。
• AIやクラウドを活用したモダン開発環境で、技術とリーダーシップの両面で成長できます。

This role involves designing and building secure, high‑performance Java backend systems for critical fintech products. You'll work with modern technologies in a fast‑paced environment where reliability, scalability, and security are essential.