Our client is a leading e-commerce marketplace platform in Japan, offering one of the largest online shopping experiences in the country. They provide a platform that connects millions of shoppers with thousands of merchants, focusing on high-quality user experience, scalability, and innovation in online commerce. We are looking for a proactive Frontend Engineer with experience in JavaScript, HTML, CSS, and React/Node.js, strong skills in performance, architecture, testing, and security, who can collaborate effectively, take ownership, and drive solutions for a large-scale e-commerce platform. Responsibilities Defined requirements, designed, developed, tested, and deployed frontend features for a large-scale e-commerce platform Collaborated with product managers, backend engineers, and cross-functional teams Monitored system stability and performance, and implemented performance optimizations Improved frontend architecture through refactoring and code optimization Troubleshot production issues and ensured high system reliability Technologies JavaScript, HTML, CSS React.js / Node.js Git Unit testing (Jest or similar frameworks) Key Skills Frontend performance optimization Web security best practices System design and architecture Unit and integration testing Collaboration in an international engineering environment Mandatory Qualifications: - Development experience with JS, HTML, CSS for more than 3 years - Development experience with React.js or Node.js - Deep understanding of frontend performance optimization - Knowledge of Web security - Experience of system design - Experience of testing (Unit Test, Integration Test) - Communication skill in English Desired Qualifications: - Experience with ESLint - Experience with unit testing implementation in JavaScript (Jest, Intern, WDIO) - Ability to design front-end architecture - DevOps experience - Experience of Git - Always act in active way and lead to the solution Languages English: Fluent Japanese: Optional / a plus Work Environment Fast-paced, dynamic global environment with collaborative teams across multiple locations Salary: 6.5M 11M JPY per year Location: Hybrid (4 days in the office, 1 day remote) Office Location: Tokyo, Japan Working Hours: Flexible schedule with core hours from 11:00 AM to 3:00 PM Visa Sponsorship: Available Language Requirement: English only Apply now or contact us for further information: