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Senior Front-End Engineer - Lead Design & Architecture at Scale
| Location | Tokyo - 23 Wards |
| Job Type | Temporary |
| Salary | 6 million yen ~ 8 million yen |
Job Description
This role leads the design and development of scalable front-end architecture for a major e-commerce platform serving tens of millions of users. You will bridge UI/UX design and engineering, ensuring high performance, maintainability, and reliability in a complex, high-traffic environment.
Client Details
Our client is a leading, large-scale internet services company operating one of Japan's largest e-commerce platforms. Serving tens of millions of consumers, the organization continuously innovates to deliver best-in-class UI/UX while maintaining stability during massive traffic events and peak campaigns.
Description
- Lead front-end architecture design from scratch (component design, state management, design systems, performanceoptimization,CDN)
- Develop, test, and deliver new user-facing features for a large-scale e-commerce platform
- Translate UI/UX wireframes into high-quality, scalable, and maintainable code
- Collaborate with designers, backend engineers, and stakeholders to bridge business, design, and technical requirements
- Build reusable components and front-end libraries for long-term scalability
- Optimize front-end performance, especially under high-load conditions
- Conduct system improvements including refactoring, architecture enhancements, and technology adoption
- Monitor production systems, troubleshoot issues, and lead incident resolution
- Ensure code quality through reviews, testing (unit, integration, E2E), and best practices
- Drive technical decisions and promote impactful solutions across teams
Job Offer
- Opportunity to lead front-end architecture for a high-impact, large-scale platform
- Exposure to cutting-edge technologies and performance challenges at scale
- Collaborative, innovation-driven engineering environment
To apply online please click the 'Apply' button below. For a confidential discussion about this role please contact Serena Wu on +81 3 6627 6137.
General Requirements
| Minimum Experience Level | No experience |
| Career Level | Mid Career |
| Minimum English Level | Fluent |
| Minimum Japanese Level | Daily Conversation |
| Minimum Education Level | Bachelor's Degree |
| Visa Status | Permission to work in Japan required |
Required Skills
- 5+ years of front-end development experience using HTML, CSS, and JavaScript
- 5+ years of experience with React, Redux, and TypeScript
- Proven ability to design front-end architecture from scratch (component-based design, state management, UX, performance optimization)
- Strong experience with testing frameworks (e.g., Jest, Cypress, Playwright, WDIO) including unit, integration, and E2E testing
- Experience with REST APIs, JSON, and CORS
- Solid understanding of asynchronous and parallel processing (e.g., Promise, WebWorkers, WebSockets)
- Experience with system monitoring, troubleshooting, and production support
- Familiarity with Linux environments and DevOps practices (Git, CI/CD tools such as Jenkins)
- Strong documentation and communication skills with the ability to explain complex concepts clearly
- Proactive mindset with the ability to identify issues, propose solutions, and drive execution
- Interest in leveraging AI tools (e.g., modern coding assistants, automation tools) to improve development processes
- Business-level English proficiency
- Experience as a Tech Lead in high-traffic web systems
- Experience managing medium-to-large scale projects
- Agile development experience
- Knowledge of linting tools and public cloud platforms (e.g., GCP)
Job Location
- Tokyo - 23 Wards
Work Conditions
| Job Type | Temporary |
| Salary | 6 million yen ~ 8 million yen |
| Industry | Software |
