Job Description: Department Overview For this position we are looking for a Frontend Engineer who is motivated to combine the art of design with the art of programming. If you are an engineer who is passionate to build SMART: Scalable, Maintainable, Automated, Reliable, Technology cutting-edge systems we are the right choice for you. Responsibilities will include translation of the UI/UX design wireframes to actual code that will produce visual elements of the application. You will work with UI/UX designers and other engineers to bridge the gap between graphical design, user requirements and technical implementation, taking an active role on both sides and defining how the application looks as well as how it works. Position: Position Details - Understand business requirements, and deliver features with high quality and speed - Leading project as senior engineer from design, develop, test, and operate new user-facing features for large scale e-commerce systems , make technical decision under complex circumstance - Build reusable, flexible and perform code and libraries for future use, bring new/fresh ideas to the team to perform system improvement (e.g.refactoring, adopting appropriate technologies & system architecture, optimizing the JS performance with a proper optimization) - Collaborate with other team members and stakeholders Mandatory Qualifications: - Experience of leading service monitoring and production environment troubleshooting/reporting - Front-end development experience using HTML/CSS/JavaScript (5 years or more) - Front-end development experience using React/Redux/TypeScript/JavaScript (5 years or more) - Experience in developing and maintaining unit tests, E2E tests, as well as integration testing - Experience with unit testing implementation in JavaScript (Jest, Intern, WDIO) - Coding and reviewing experience considering performance, maintainability, and security - Experience with Web API (REST, JSON, CORS) - Understanding and experience with parallel and asynchronous processing (AJAX, Promise, WebWorkers, WebSockets) - Investigation and operational experience on Linux - Software configuration management (version control [Git], build management [Jenkins], etc.) - DevOps experience - Document creation skills such as design documents and test cases - Communication skills in English Desired Qualifications: - A person who can identify team's challenges, propose solution based on root cause analysis, execute actions proactively - Waterfall style project (scale larger than 5 man-month) management experience - Agile software development experience - Experience with ESLint - A person who can actively leverage the AI knowledge to contribute to business process improvement and service enhancement.(e.g. Claude code, MCP server, etc.) Other Information: Additional information on English Qualification TOEIC Score 800 above or possess equivalent abilities #engineer #applicationsengineer #commerce #RakutenIchiba 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