Valentin Gurkov developed Next.js 16 compatibility for the react-query-next-experimental package in the TanStack/query repository, focusing on seamless integration with the latest React ecosystem. He updated dependencies and configuration files using JavaScript and TypeScript, ensuring that the package remained stable throughout the upgrade process. Valentin implemented automated CI fixes to maintain build reliability and reverted an unintended tsconfig change to preserve existing functionality. His work addressed the need for early adoption support for Next.js 16, enabling users to upgrade with confidence. The project demonstrated depth in full stack development, emphasizing careful configuration management and forward-looking compatibility engineering.