Join one of Japan's largest and most recognized E-Commerce and Technology companies as a Senior Frontend Engineer and help shape the customer-facing experience of a platform used by millions of users every day.
In this role, you will lead the development of scalable frontend applications that power a world-class online marketplace. Working alongside global engineering teams, you will drive frontend architecture, performance optimization, and user experience enhancements while contributing to high-impact projects that directly influence customer engagement and business growth.
This is an excellent opportunity for engineers passionate about React.js, JavaScript, Frontend Development, E-Commerce, Web Performance, and Modern Web Technologies.
Key Responsibilities
- Lead the design, development, testing, and deployment of large-scale frontend applications and web services.
- Develop and maintain high-quality frontend solutions using modern JavaScript frameworks and technologies.
- Optimize frontend performance to deliver fast, seamless, and engaging user experiences across multiple devices.
- Troubleshoot technical issues, investigate system behavior, and provide operational support when required.
- Collaborate closely with product managers, designers, backend engineers, and security teams to deliver business-critical features.
- Drive frontend architecture discussions and contribute to technical decision-making.
- Implement automated testing strategies to improve software quality and maintainability.
- Support platform security, operational excellence, and continuous improvement initiatives.
Required Skills and Qualifications
Experience:
- 3+ years of professional software development experience using JavaScript, HTML, and CSS.
- Hands-on experience developing applications with React.js and/or Node.js.
- Strong experience in frontend system design and architecture.
- Experience implementing automated testing, including unit testing and integration testing.
- Experience building and maintaining large-scale web applications.
- Familiarity with modern software development methodologies and Git-based workflows.
Soft Skills:
- Strong communication skills with the ability to work effectively in a multinational environment.
- Proactive problem-solving mindset with a strong sense of ownership.
- Leadership capabilities with experience mentoring team members or leading technical discussions.
- Ability to collaborate across multiple teams and stakeholders.
- Strong analytical thinking and attention to detail.
- Passion for continuous learning and technology innovation.
Language Requirements:
- Japanese: Basic level.
- English: Fluent.
Preferred Skills & Qualifications
- Experience with ESLint and frontend code quality tools.
- Experience using testing frameworks such as Jest, Intern, or WDIO.
- Understanding of frontend architecture design principles.
- Knowledge of DevOps practices, CI/CD pipelines, and Git workflows.
- Experience working within high-traffic E-Commerce platforms.
- Familiarity with performance optimization and frontend security best practices.
About the Company
Our client is one of Japan's most influential E-Commerce and Technology organizations, operating a massive digital ecosystem that serves millions of consumers daily.
With a strong global presence and a culture centered around innovation, technology, and collaboration, the company empowers engineers to work on highly scalable systems that impact customers across Japan and beyond. Employees benefit from the stability of an industry leader while enjoying the energy and innovation of a modern technology company.
Why You'll Love Working Here
- Work on one of Japan's largest consumer-facing E-Commerce platforms.
- Collaborate with highly skilled international engineering teams.
- Gain exposure to cutting-edge frontend technologies and large-scale web architecture.
- Influence products used by millions of users every day.
- Enjoy a flexible hybrid work environment.
- Casual dress code and modern workplace culture.
- Access to an employee food hall with meals provided.
- Opportunity to accelerate your career within a globally recognized technology company.
- Build expertise in modern frontend engineering, performance optimization, and scalable web development.
Don't Miss Out - Apply Now!
