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Xingzhan Feng
Senior Frontend Software Engineer specializing in healthcare SaaS platforms
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Senior frontend/product-minded engineer with deep ownership of checkout and payments at a healthcare marketplace, where they drove the guest checkout strategy, unified Stripe and PayPal/Venmo flows, and supported a path handling $6M+ annually. They also led a Vue-to-Next.js TypeScript migration that dramatically improved performance and established CI/CD, observability, and engineering standards for a multi-engineer team.
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Key Strengths
- End-to-end ownership of checkout and payments for a healthcare marketplace
- Product judgment backed by user behavior, including driving guest checkout adoption
- Unified multi-gateway payments architecture across Stripe and PayPal/Venmo
- Cross-functional leadership across frontend, backend, design, and QA
- Strong frontend architecture leadership in Vue-to-Next.js TypeScript migration
- Performance optimization with 82% FCP improvement and 74% Speed Index improvement
- Deployment and engineering standards leadership, cutting deploy time by ~80%
- Practical observability mindset using Sentry to reduce payment debugging guesswork
- API contract design that normalized gateway complexity behind backend abstractions
- Business impact on a flow handling $6M+ annually
- Improved customer experience with ~80% of orders coming through guest checkout
- Reduced payment-related bugs and support complaints after launch
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