Navneev contributed to backend reliability and feature enablement in both the apache/lucene and facebookresearch/faiss repositories. He stabilized KNN vector query testing in Lucene by refining test assertions, directly improving CI stability and production reliability. In FAISS, Navneev extended the GpuIndexCagra index by integrating IndexIDMap support, enabling vectors to be stored and retrieved with associated IDs and addressing a user-reported gap in ID-based indexing workflows. His work leveraged C++ and Java, with a focus on GPU programming, index management, and robust testing. Over the month, Navneev delivered targeted, production-impactful changes that addressed both feature and stability requirements.