楽天では、次世代広告プラットフォームのアーキテクチャを設計・牽引するシニアソフトウェアエンジニアを募集しています。JavaおよびGCP環境での大規模システム設計経験と、Agentic AIやLLMアプリケーションの構築能力が必須です。技術リーダーシップを発揮し、チームの生産性と技術文化を主導できる方を求めています。
The Ad Product Section (APS) division is a high-performance, global team distributed across Tokyo, Singapore, India, and China. We pride ourselves on being a hub of technical excellence, where motivated, diverse, and talented engineers collaborate to solve complex problems at scale.
We are seeking a Senior Software Engineer to join our team and help us define the next generation of our advertising platform. This is not just a coding role; it is a position of architectural and technical cultural leadership.
You will own the end-to-end product development lifecycle, leveraging a modern tech stack and AI-augmented workflows to deliver high-impact solutions. We are looking for a technologist who doesn't just keep up with the industry, but shapes it—someone who thrives on building scalable systems, mentoring the next generation of engineers, and integrating AI to push the boundaries of productivity and software quality.
If you are a builder who values technical rigor, thrives in cross-functional environments, and is eager to contribute to Rakuten’s expansive global ecosystem, we want to talk to you.
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.
Core Requirements (The "Must-Haves")
Technical Proficiencies
Preferred Qualifications (The "Nice-to-Haves")
Frontend Expertise: Proficiency in modern frameworks like React.js or Angular.
