会社名

楽天グループ株式会社

会社概要

未来を信じ、より良い明日を創っていく。
イノベーションを通じて、人々と社会をエンパワーメントする。私たちは、そんな想いを大切に世界の人々に喜びと楽しさを届けます。
楽天は、E コマース、FinTech、デジタルコンテンツ、通信など、70 を超えるサービスを展開し、世界10 億以上のユーザーに利用されています。
これら様々なサービスを、楽天会員を中心としたメンバーシップを軸に有機的に結び付け、他にはない独自の「楽天エコシステム」を形成しています。ダイバーシティ推進は、楽天にとって最優先の企業戦略のひとつです。従業員の出身は70カ国・地域以上。世界中からユニークで多様な文化的背景や視点を持つ優秀な人材が集まり、イノベーションの原動力になっています。社内カフェテリアにはベジタリアン、ハラル対応のメニューを用意。礼拝所（Prayer room）もあります。
また、仕事と育児の両立支援や、障がい者雇用・活躍促進も積極的に推進。社内のLGBT（※1）当事者やアライ（※2）に対して、情報共有やサポート体制の強化も進めています。誰もが自分らしく力を最大限発揮して働ける。それが楽天のダイバーシティです。

70を超えるサービスを提供し、世界30カ国にサービス展開拠点を持ち、従業員の出身国・地域数は100を超え、オープンポジション制度を活用して多様なキャリアを描くことができる点も魅力です。
フレックスタイム制度、事情に応じたリモートワークの活用が可能です。本社には託児所やフィットネスジム、三食無料で利用可能なカフェテリアが併設されるなど、社員を支える環境が整備されています。

ポジション

1033231　Senior Software Engineer, Display Ads Group, Ad Product Development Department (GATD)

仕事内容

Position:
Position Details
Roles and Responsibilities
* Project Execution & Engineering Excellence
* Technical Leadership: Translate complex business requirements into robust, scalable, and maintainable technical specifications and architectural designs.
* Lifecycle Ownership: Own the full SDLC—from initial design and implementation to deployment, monitoring, and proactive maintenance across all environments.
* Quality Assurance: Conduct rigorous code reviews, ensuring adherence to design patterns, security best practices, and long-term maintainability.
* AI-Augmented Development: Drive engineering velocity by integrating AI-powered coding assistants (e.g., GitHub Copilot, Cursor) into the team’s workflow. Establish standards for AI-assisted code generation, ensuring that AI-written code is rigorously vetted for security, accuracy, and alignment with system architecture.
* Strategic Innovation & Productivity
* System Stewardship: Maintain a deep understanding of the product ecosystem to identify technical debt and architectural bottlenecks. Proactively propose and lead initiatives to refactor or enhance systems for better performance and scalability.
* AI-Driven Productivity: Leverage advanced prompt engineering to automate repetitive tasks—such as documentation generation, legacy code refactoring, and test suite creation—to maximize team bandwidth.
* Tech Radar: Stay ahead of the curve by evaluating emerging technologies and AI tools, creating strategic roadmaps to integrate innovations that provide a competitive advantage.
* Collaboration & Cross-Functional Impact
* Partnership: Act as the primary technical bridge between Product, Design, and Engineering. Translate high-level business objectives into clear, actionable technical plans.
* Technical Advocacy: Influence product roadmaps by anticipating future technical constraints and opportunities, ensuring the platform remains resilient as business needs evolve.
* Mentorship & Technical Culture
* Team Growth: Actively mentor junior engineers and interns. Foster a culture of technical excellence by providing constructive feedback, guiding career progression, and promoting best practices in software design.
* Knowledge Sharing: Champion a culture of continuous learning, ensuring the team stays informed on modern development paradigms and AI-assisted workflows.

求める経験・スキル

Mandatory Qualifications:
Core Requirements (The "Must-Haves")
* Experience & Impact: 10+ years of professional software engineering experience, including 3+ years in principal/architect-level role and a proven track record of leading complex, large-scale web application projects from inception to production.
* Architectural Mastery: Deep hands-on expertise in Java (Spring Boot/Batch) and Cloud-native architectures (GCP ecosystem: BigQuery, DataProc, Composer). Ability to design for scale, performance, and high availability.
* Data Strategy: Strong proficiency in both relational (MariaDB/MySQL) and NoSQL (MongoDB) databases, with the ability to choose the right data storage strategy for specific architectural needs.
* AI-Augmented Engineering:
* Agentic AI: Demonstrated experience in designing or implementing Agentic AI workflows (e.g., using frameworks like LangChain, n8n, dify, or custom agent orchestration) to solve complex business problems.
* LLM Systems Architecture & Design: Expert in designing and deploying production-grade LLM applications. Proficient in end-to-end architectural strategy, including model selection, optimized RAG pipelines, agentic orchestration, tool integration, and rigorous evaluation frameworks to ensure performance and reliability..
* Developer Productivity: Expert-level fluency in AI-assisted coding tools (Cursor, GitHub Copilot, Claude Code) to drive high-velocity development while maintaining rigorous security and quality gates.
* System Design:
* Analyzing complex business systems, industry requirements and governance, and creating solution designs from them
* Proven architecture and design experience for cloud-based platforms and enterprise applications including defining microservices boundaries, API design, and asynchronous communication patterns.
* Soft Skills & Ownership: A "get-things-done" mindset with demonstrated accountability for system health and team output. Excellent communication skills, with the ability to present architectural decisions to mixed audiences including Senior Management, Product Management, and Engineers across disciplines.
* Product Thinking with Analytical Capabilities: Strategic Product Thinking with deep analytical abilities to transform complex business requirements into high-margin, AI-driven platform capabilities.

Desired Qualifications:
Technical Proficiencies
* Languages & Frameworks: Java (Spring Boot/Batch), JavaScript/TypeScript (HTML5/CSS3)
* Data & Infrastructure: MariaDB/MySQL, MongoDB, GCP (BigQuery, DataProc, Composer)
* AI/Agent Frameworks: LangChain, LangGraph, n8n, ADK, MCP (Model Context Protocol), or equivalent
* LLM Tooling: Prompt engineering, RAG, vector databases, LLM observability (LangFuse or equivalent)
* AI Developer Tools: Claude Code, Cursor, GitHub Copilot — fluent in AI-assisted engineering workflows
* Tools & Process: Version Control (Git), Agile/Scrum, Task Management (Jira)