Worked on enhancing developer experience and cross-runtime compatibility in open source projects. Improved the Z3Prover/z3 repository by refining TypeScript typings and documentation, enabling more intuitive instantiation of the Context class and reducing onboarding friction for TypeScript users. In the emscripten-core/emscripten repository, focused on enabling pthreads support in Deno and Bun by implementing feature detection for postMessage, which resolved conflicts with Web Worker APIs and stabilized multithreading across environments. Leveraged skills in API development, TypeScript, and multithreading, delivering targeted features that improved integration reliability and portability for JavaScript and TypeScript projects without introducing new bugs during the period.