Timothy Chu

Developed and maintained high-traffic React Native mobile applications with backend RESTful API integration and third-party services. Architected scalable features using Redux, collaborated with backend engineers and UX designers, and implemented automated testing with Jest and Detox to improve stability. Led code reviews, resolved complex integration issues, optimized startup time and memory usage, provided on-call production support, and documented designs for remote teams.

Designed and shipped fraud‑analysis‑focused features using React, TypeScript, Python, Golang, PostgreSQL, Docker, AWS Lambda, Cognito, and RDS, while mentoring engineers and enforcing secure coding standards. Built and optimized API‑driven microservices using Python, Golang, REST, AWS Lambda, API Gateway, and PostgreSQL, ensuring low‑latency data access for fraud detection workflows. Developed scalable frontend architectures integrating React, Next.js, Redux Toolkit, React Query, AWS Cognito auth flows, and data‑intensive UI rendering, improving analyst productivity by 35%. Implemented unit tests, integration tests, and end‑to‑end automation using Jest, React Testing Library, PyTest, and Go test frameworks, increasing platform reliability and reducing regression defects. Collaborated with Product, Design, Data Science, Infrastructure, and Solutions Engineering to define requirements, analyze product metrics, and ship features aligned with fraud-prevention goals. Troublesh

Built native iOS and Android features using Swift and Java; collaborated with Angular web teams for consistent UX; supported backend API integration; contributed to documentation and architecture patterns; improved app security and performed testing to minimize defects; participated in agile ceremonies and code reviews.