Worked on the emscripten-core/emscripten repository to deliver AVX2 support through WebAssembly SIMD emulation, enabling 256-bit AVX2 intrinsics in Emscripten-compiled applications. The approach involved emulating AVX2 instructions using 128-bit WebAssembly SIMD, updating compiler flags to activate the new support, and integrating comprehensive tests to validate SIMD behavior. Documentation and examples were expanded to assist developers in adopting AVX2 features within their workflows. The work focused on compiler development and low-level optimization using C, C++, and Python, improving performance potential for SIMD-heavy workloads and facilitating broader hardware compatibility without introducing major bug fixes during the period.