Chenfei Yu

About

Frontend-leaning full-stack engineer who shipped a civic-tech Next.js/TypeScript app (Boston Police Index) with SSR, dynamic routing, and server-side data fetching, then iterated post-launch with UX and performance improvements. At Walmart (Seller Center micro-frontends), drove large-scale React/TypeScript refactors—standardizing state management, improving hook usage, and cutting type errors ~50%—and earned trust to serve as a code reviewer enforcing quality standards.

Experience

Education

Key Strengths

• Shipped end-to-end full-stack feature in production with Next.js App Router + TypeScript (SSR, dynamic routes, search params)
• Performance-minded: migrated Supabase to Postgres on Railway and introduced Prisma to improve API performance and DX
• Initiated progressive backend migration from Express.js to Fastify.js for scalability (partial completion due to internship end)
• React performance refactoring: reduced unnecessary re-renders (useEffect cleanup, memoization, stable callbacks) and standardized state management
• Improved code quality measurably: reduced TypeScript errors ~50% across 3 micro-frontend modules (tsc/linter measured)
• Strong engineering-quality discipline: maintains >90% unit/E2E expectations, fixes SonarQube code smells instead of suppressing
• Demonstrated ownership via enforcing standards in code reviews and proactively fixing legacy issues