During May 2025, Simon Marlow focused on modernizing Haskell code indexing across core repositories including facebook/fboss, CacheLib, fbthrift, and sapling. He redesigned the Haskell indexer to read .hie files directly, streamlining the indexing pipeline and improving both correctness and performance. This work involved schema redesign and enhancements to cross-reference coverage, resulting in richer information capture and a simpler, more robust architecture. Leveraging expertise in Haskell, compiler development, and static analysis, Simon delivered four new features that unified indexing approaches across these repositories, demonstrating depth in software architecture and a thoughtful approach to maintainability and information accuracy.