Worked on the facebookresearch/faiss repository to address decoding reliability in C++ decoders by reverting NEON-based optimizations for Index2LevelDecoderImpl and IndexPQDecoder. This change restored a general implementation path, resolving correctness issues with certain fine sizes while maintaining the existing performance envelope. The approach prioritized robust inference across diverse datasets and hardware, with careful validation of workloads to ensure stability. The update preserved API compatibility and improved maintainability by documenting the rationale and enhancing test coverage for decoder variants. The work demonstrated expertise in C++ programming, algorithm design, and performance optimization, focusing on practical solutions to edge-case decoding problems.