Senior Frontend Engineer - EC Marketplace Development Department (ECMPD)
Location: Tokyo, Japan
Time Type: Full time
Job Description
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
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