Letian Xu

At PetoLab, I built and shipped RN features backed by Spring Boot, focusing on creating reusable components and integrating various technologies to unify user experience across platforms. I also resolved over 50 issues, designed a data preprocessing pipeline, and elevated product quality through comprehensive automated testing.

Built cross-platform interfaces with React Native and Material-UI, translating wireframes into reusable components. Integrated Google Maps, Vision Camera, and media sharing to deliver a seamless iOS, Android, and Web experience. Built scalable pipelines with Spring Boot, MySQL, DynamoDB, and AWS SQS on ECS (Fargate) with Docker for efficient async workflows. Leveraged Redis for feed ranking and Bloom filters to efficiently process and cache user data; pipelines handled up to 30k messages/hour and reduced end-to-end data latency by 60%. Implemented testing and quality automation (400+ unit/integration tests, 120+ E2E tests), raising backend test coverage to 92% and cutting post-release incidents by 70%.

Built cross-platform interfaces with React Native and Material-UI, translating wireframes into reusable components. Integrated Google Maps, Vision Camera, and media sharing to deliver a seamless iOS, Android, and Web experience. Built scalable pipelines with Spring Boot, MySQL, DynamoDB, and AWS SQS on ECS (Fargate) with Docker for efficient async workflows. Leveraged Redis for feed ranking, Bloom filters to efficiently process and cache user data; pipeline handled up to 30k messages/hour and reduced end-to-end data latency by 60%. Implemented testing and quality automation (400+ unit/integration tests, 120+ E2E tests), raising backend test coverage to 92% and cutting post-release incidents by 70%.