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Senior Front-End Engineer - Lead Design & Architecture at Scale

Tokyo 23 Wards Temporary ¥6,000,000 - ¥8,000,000 per year Foreign Multinational View 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.
  • Own large-scale UI architecture for millions of users
  • Drive performance & UX in high-traffic e-commerce systems

About Our Client

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.

Job 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

The Successful Applicant

  • 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

Preferred:

  • 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)

What's on 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



Contact
Serena Wu
Quote job ref
JN-062026-7040075
Phone number
+81 3 6627 6137

Job summary

Function
IT
Specialisation
Programming / Development
Specialisation
Technology & Telecoms
Location
Tokyo 23 Wards
Job Type
Temporary
Consultant name
Serena Wu
Consultant phone
+81 3 6627 6137
Job Reference
JN-062026-7040075
Company Type
Foreign Multinational

Diversity & Inclusion at Michael Page

We don't just accept difference - we celebrate it. We encourage applicants from all backgrounds to apply for this role and are committed to building inclusive, diverse workplaces where everyone can thrive. If you require any support or reasonable adjustments during the recruitment process, please let us know.