Senior Frontend Engineer

A Global IT Service firm is seeking a Senior Frontend Engineer. 

Responsibilities:
- Participate in frontend development projects from early planning and requirements definition through implementation and production deployment
- Design, develop, and maintain scalable, high-quality frontend systems for high-traffic e-commerce platforms, focusing on performance, accessibility, and maintainability
- Build reusable React components and contribute to frontend architecture using modern technologies including Next.js, TypeScript, and state management libraries
- Collaborate closely with product managers, designers, backend engineers, QA teams, and business stakeholders to define requirements, project scope, and technical solutions
- Lead technical decision-making, own complex features, and drive initiatives that improve engineering productivity and development processes
- Prepare technical specifications, design documents, and present technical proposals and project updates to both technical and non-technical stakeholders
- Conduct code reviews, mentor team members, and provide technical leadership within a global, cross-functional engineering team across Japan and China
- Partner with product teams to influence product direction, roadmap planning, and deliver business-impacting solutions
- Leverage AI-powered development tools and review AI-generated code to ensure correctness, security, and adherence to best practices

Required Skills:
- 5+ years of professional frontend development experience, preferably in e-commerce or other high-traffic consumer applications
- Proven experience delivering frontend projects end-to-end, from requirements gathering and technical planning to production deployment
- Experience coordinating with cross-functional teams, including Product, Design, Backend Engineering, and QA
- Strong proficiency in React (React 16+), including component lifecycle, Hooks, and modern development patterns
- Strong experience with TypeScript, including generics, utility types, and type-safe development practices
- Hands-on experience with Next.js (App Router or Pages Router), modern JavaScript (ES6+), HTML5, CSS3, responsive design, and modern CSS methodologies such as Tailwind CSS, CSS Modules, or CSS-in-JS
- Experience with testing frameworks and methodologies, including unit, integration, and end-to-end testing using tools such as Jest, React Testing Library, and Playwright
- Experience with Git workflows, code reviews, and modern software development best practices
- Experience with Agile/Scrum methodologies, sprint planning, and technical leadership or people management is highly desirable
- Experience writing technical specifications, RFCs, and design documentation, and serving as a technical point of contact for stakeholders
- Understanding of web accessibility (WCAG), Core Web Vitals, SEO best practices, and frontend performance optimization
- Experience with design systems, component libraries, internationalization (i18n), monitoring tools (Sentry, Datadog, Cloud Logging), and design collaboration tools such as Figma is preferred
- Familiarity with modern frontend technologies including TanStack Query, Zustand, React Server Components, Streaming SSR, and Suspense is an advantage

Why should you apply:
- Great opportunity to be able to work for well-established company
- Cross-departmental communication is possible in an international environment
- Drive innovation and maintain high standards for products utilized on a huge scale 


Company Overview: This is a global company with a strong presence in multiple business sectors. It has achieved sustained growth both domestically and internationally, including in the U.S. and Europe. The company prides itself on its diverse and international environment, providing ample career opportunities and a commitment to equal opportunity. With a wide range of business activities, the company also works with various technologies. You can choose your preferred working environment, whether Windows or Mac! Meals at the employee cafeteria are free, and the chef regularly comes up with new menus, ensuring you never get bored of the meals!

Work Hours: 9:00 AM – 5:30 PM (Flextime or staggered working hours possible)
Work Style: Hybrid (Typically 4 days in the office, 1 day working from home)
Holidays: Saturdays, Sundays, public holidays, New Year holidays, paid leave, bereavement leave, and other special leave
Benefits: Full social insurance (employee pension insurance, health insurance, worker’s accident compensation insurance, unemployment insurance), DC pension plan, transportation allowance, childcare and caregiving support, cafeteria, retirement benefit system, welfare services (Relo Club), health counseling services, relocation support (visa support, moving), employee discounts (moving, language classes, etc.), and more
Interview Process: 3~4 times