Tech Lead for Backend (Skill based)- Media and Data Solutions Development Department (MDSD)

Job Description: Department Overview Media & Data Solutions Department has union of services that contribute to the marketing solutions in entire Rakuten. Our media & tech solutions and assets consist of data acquisition and delivery platforms for market research, analytics and marketing solutions, user engagement contents, ad-medias/inventories, omni-channel business platforms, OMO solutions, etc. Our department develops and operates one of Japan's largest online market research systems. We operate both business and consumer systems, allowing you to experience the fun and challenges of each. For business systems, we develop and operate a survey creation system that allows for targeting survey respondents similar to that used in online advertising, and complex question design. For consumer systems, we develop and operate a survey response system (web, iOS app, Android app) that allows survey respondents to respond. We also develop new services that combine big data built from large-scale surveys with AI, creating the services needed to understand people's behavior using cutting-edge technology. 　 Position: 　 Position Details You will be responsible for the functional design, development, and operation of our online market research system. In addition to API and batch development primarily using Java and Python, you will also be involved in the product design and development of new features utilizing big data. Why This Position Is Attractive Impact on the Market: By working on one of Japan's largest online market research systems, you will experience the thrill of driving the entire market through technology. AI-based development process: Our group actively utilizes the latest AI technologies, such as Claude Code. We are promoting the use of AI in processes such as code generation, review, and test automation to improve development efficiency and quality. By devising and practicing new development methods using AI, you will be able to hone the skills necessary for engineers in the AI era. End-to-End Product Development: As you will be responsible for our in-house service from development to operation, you can approach your work with deep attachment and a strong sense of ownership for the product. Responsibilities Functional design, coding, testing, release, and operational monitoring Investigation, root cause analysis, recovery, and implementation of permanent countermeasures for system troubles Research and consideration of new technologies, and proposals for improving existing processes and systems 　 Work Environment Infrastructure: Kubernetes, RDBMS, redis, Jenkins Application: Java, Python, PHP, JavaScript, swift IDE： IntelliJ 　 　 Mandatory Qualifications: - Java development and operation experience (3+ years) - RDMS development and operation experience (3+ years) - REST API design and development experience - k8s/Docker development experience - Business Level Japanese 　 　 Desired Qualifications: - AI development experience - Secure, scalable and maintainable coding experience - Working experience as tech lead 　 　 Other Information: Additional information on Location Tokyo #techlead #engineer #backend #webdeveloper #Java #Python #RakutenInsight Languages: Japanese (Overall - 3 - Advanced) In Japanese, Rakuten stands for ‘optimism.’ It means we believe in the future. It’s an understanding that, with the right mind-set, we can make the future better by what we do today. So we challenge ourselves to evolve, innovate and experiment, to create a better, brighter future for everyone. Today, our 70+ businesses span e-commerce, digital content, communications and fintech, bringing the joy of discovery to almost 1.3 billion members across the world. If you have any trouble logging in, please contact us here Rakuten Group, Inc.: rakuten-recruiting-info@mail.rakuten.com Please read the Application Requirements(EN) / 募集要項(JP) before applying. Our Diversity & Inclusion Policy and Application Documents Rakuten’s corporate mission is to “contribute to society by creating value through innovation and entrepreneurship.” We foster a culture that provides equal opportunities to those who share this founding philosophy and take on the challenge to transform society, regardless of age, gender, nationality, or any other status. Diversity is one of Rakuten's core strategies and a driving force for innovation. Because of this, you are not required to submit any of the following information in order to apply for our job positions. - Gender - Age - Photo - Nationality - Information not related to business, such as ideological beliefs, family structure, etc. * For legal compliance, we may ask you about your work eligibility. See the details