Jacky Han

I am a senior software engineer with deep experience building scalable, secure payment platforms and customer-facing applications. I have led cross-functional initiatives that connect global wallets and partner payment services using React, TypeScript, Java, Node.js, and GraphQL.

At PayPal I architected a cross-border payments platform that expanded access to billions of wallet users, improved international checkout completions by double digits, and processed millions of cross-network transactions daily with low added latency. I emphasize performance, reliability, and security, implementing optimizations like code-splitting, GraphQL batching, OAuth2 flows, and comprehensive test coverage.

Previously I delivered global ticketing and mobile-first experiences at StubHub, increasing mobile engagement and improving multilingual buyer conversion through responsive UI, scalable APIs, and improved event discovery. I have a track record of shortening partner integration time, reducing defects, and accelerating CI/CD pipelines with Docker and Kubernetes.

I value collaboration with product and UX teams to deliver localized, compliant experiences across international markets, and I bring a pragmatic, metrics-driven approach to building resilient distributed systems and developer-friendly integrations.