Design, build, and scale backend services in C#/.NET and responsive frontends in React/TypeScript. Define APIs, ensure high-availability databases, optimize performance and security, integrate REST/GraphQL, maintain tests, mentor junior engineers, collaborate with designers and product owners, and use AI-assisted developer tools.

Design, implement, and maintain automated testing across frontend and backend systems for a SaaS engineering platform. Build regression automation, execute smoke, integration, performance and manual tests as needed, document results, identify bugs and risks, and collaborate with Product and Engineering to improve automation-first quality engineering and release reliability.