Tomasz Wieczorek

Tomasz is a senior frontend engineer with eleven years of experience, currently a tech lead at a Berlin-based fintech where he migrated 180 routes from CRA to Next.js 14 App Router over nine months without a single user-facing outage. Before that, four years at Klarna building the merchant dashboard in Next.js, and two years at a small agency in Krakow shipping marketing sites for European retailers. He maintains two small open-source libraries in the React ecosystem, one for typed environment variables and one for a Suspense-friendly data fetching wrapper that predates the React 19 use() hook. He prefers Drizzle over Prisma, NextAuth over Clerk for self-hosted setups, and has strong feelings about putting business logic in Server Components. He writes the kind of tutorials that show the broken intermediate state, not just the working final code.