Andrew Said worked on optimizing the routing subsystem in the dotnet/aspnetcore repository, focusing on performance improvements for high-traffic scenarios. He introduced an AlternateLookup mechanism for the DictionaryJumpTable, which prevents unnecessary string allocations during path segment lookups. This technical approach reduced memory allocations and lowered garbage collection pressure, directly improving routing throughput and user-perceived latency. Andrew applied his expertise in C#, data structures, and performance optimization to align the routing system with broader efficiency goals. The work demonstrated a deep understanding of low-level system behavior and contributed a targeted feature that addressed a specific bottleneck in ASP.NET Core’s request routing.