Job Description
Business Overview
Rakuten is one of the biggest marketplace of Japan and is the largest internet ecosystem with a wide range of services ranging from e-Commerce, Travel, Banking, Fintech, Food Delivery, Golf, Insurance, Instant Messaging, Mobile Network etc. Rakuten has over 140 services globally. Our mission is to empower people and society through the internet while aiming at becoming the Global Innovation Company.

Department Overview
The Agent Experience Department (AGEX) team is pioneering the development of Rakuten AI Companion and AI Composer: two complementary AI initiatives designed to transform how users engage with the Rakuten ecosystem and beyond.

The Rakuten AI Companion is a next-generation personal assistant that supports a wide range of user needs, from navigating Rakuten's services to assisting with everyday goals. Built with a user-centric and task-oriented approach, it delivers an experience that is intuitive, helpful, and truly personal: empowering users across all aspects of their digital lives.

Running in parallel, the AI Composer is engineered to infuse seamless AI-driven experiences across Rakuten's product ecosystem: generally, contextually, and personally.

By embedding intelligence into user touchpoints, AI Composer ensures that every interaction feels natural, anticipatory, and deeply integrated with individual needs.

Together, AI Companion and AI Composer form the foundation of Rakuten's next-generation AI Agent Experience: intelligent, adaptive, and human-centered.

Position
Why We Hire
We are seeking innovative and dedicated Full Stack Software Engineers to join the Rakuten Agent Experience Department (AGEX). Rakuten AI strives to be your Rakuten AI companion, providing the best AI user experience: generally, contextually, and personally. Rakuten AI aims to serve as the AI Core of the Rakuten ecosystem, enhancing interconnections between Rakuten services and users to delight customers worldwide more than ever before.

This role involves advancing the AI user experience to serve as the foundational core across the Rakuten products ecosystem by developing innovative AI user experience framework. The ideal candidate will have a strong passion for building solid, flexible, and immersive AI user experiences using state-of-the-art technologies and will contribute to a unified vision that enhances Rakuten AI foundation at scale.

We also welcome exceptional engineers from diverse fields who may not have direct experience in AI. This role is an opportunity to gain critical skills and knowledge needed to transition into the AI space. We are dedicated to supporting career changers who bring unique perspectives and expertise. Our commitment includes offering mentorship and resources to facilitate your growth in cutting-edge AI domains.

Position Details

• Develop and Maintain Web Applications: Design, build, and maintain front-end and back-end features for web applications, ensuring they are scalable and high-performing.
• Work with Front-End Technologies: Use HTML, CSS, JavaScript, and frameworks like React, Angular, or Vue to create intuitive and responsive user interfaces.
• Develop Back-End Services: Build server-side logic and application programming interfaces (APIs) using technologies like , Python, Java, or Ruby.
• Data schema design and database management: Design and manage databases, such as MySQL, MongoDB, PostgreSQL, Vector Databases, etc., ensuring efficient data storage and retrieval.
• Integrate APIs and Third-Party Services: Integrate external APIs and services, such as payment gateways, social media APIs, or analytics tools, as needed.
• Implement Security Best Practices: Ensure the security of web applications by implementing secure coding practices, data protection, and user authentication mechanisms.
• Perform Testing and Debugging: Write unit, integration, and end-to-end tests, troubleshoot issues, and resolve bugs across the full stack of the application.
• Collaborate with Cross-Functional Teams: Work closely with designers, product managers, and other engineers to gather requirements, plan features, and deliver user-centered solutions.
• Optimize for Performance: Improve performance by optimizing application code, databases, and server configurations to reduce latency and increase efficiency.

Mandatory Qualifications

• Bachelor's Degree or above in Computer Science or related field or equivalent practical experience.
• Fluent spoken English, written English with effective communication skills and a collaborative attitude, performing cross-functional teams collaboration.
• Proficiency in front-end technologies like HTML, CSS, and JavaScript, and experience with at least one modern front-end framework (e.g., React, Angular, or Vue).
• Experience in Back-End Development, knowledgeable of server-side languages such as C#, Java, Python, , Ruby, or PHP and familiarity with building RESTful APIs and knowledgeable of Web Development Frameworks.
• Familiarity with variety of data schema design, and database management, e.g. relational databases (e.g., MySQL, PostgreSQL) and/or NoSQL databases (e.g., MongoDB, Cassandra).
• Basic Understanding of Cloud Services : Exposure to cloud platforms (e.g., AWS, Azure, Google Cloud, Azure) and understanding of deploying applications in a cloud environment.
• Experience with Testing Practices and experience with unit testing, integration testing, and end-to-end testing.
• Understanding of Security Best Practices such as authentication, authorization, and data protection, to secure applications.
• Proficiency in Debugging and Problem-Solving across both front-end and back-end systems.
• Familiarity with Continuous Integration/Continuous Deployment (CI/CD) pipelines to automate deployment processes.
• Ability to Write Clean, Maintainable Code, adherence to coding standards and best practices, with a focus on creating well-organized, readable, and maintainable code.
• Adaptability and Willingness to Learn, ability to quickly learn new technologies and adapt to changing project requirements.
• Experience in AI-related products is preferred.

Other Information
Additional information on Location
Rakuten Crimson House (Head Office)

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Languages
English (Overall - 4 - Fluent)