- Designed and implemented scalable backend systems using Node.js and Python, reducing API response time by 40%. - Led the development of a fintech application that processed over ¥10 billion in transactions within the first year of launch. - Streamlined development workflows by integrating CI/CD pipelines, resulting in a 30% reduction in deployment time. - Collaborated with cross-functional teams to improve UX/UI design, increasing customer retention rates by 25%. - Migrated legacy systems to modern cloud-based architectures on AWS, improving system reliability and scalability.

- Developed dynamic, responsive web applications using React.js and Vue.js, enhancing user experience across devices. - Optimized database performance by implementing efficient indexing and query optimization, resulting in a 20% decrease in latency. - Played a key role in building microservices architecture, ensuring seamless integration between components. - Mentored junior engineers, fostering a culture of continuous learning and technical excellence.

- Built and maintained web applications using PHP and JavaScript, contributing to an increase in client satisfaction. - Assisted in debugging and resolving software issues, improving application stability. - Supported project managers by documenting technical requirements and conducting code reviews.