• Completed a stateless e-commerce website in 4 weeks including cache mechanism and rate limiter
• Cooperated with cross-functional team (Front-End, Android, iOS) for developing new features such as coupon and arrival notice, contributed ideas, and sent emails with serverless framework (API Gateway, Lambda)
• Developed with SCRUM methodology and cooperated efficiently with team members
• Designed a URL shortener with high concurrency by utilizing database sharding and unique key constraint