Worked on build-system reliability and data-structure optimization across the simonmichael/stackage and swarm-game/swarm repositories over three months. Focused on enhancing build configuration by updating constraints to include packages like monoidmap-aeson, monoidmap-quickcheck, monoidmap-internal, and monoidmap-examples, improving dependency hygiene and CI stability without altering functional code. In swarm-game/swarm, refactored the robotsWatching data structure from Map to MonoidMap and optimized related functions to improve query performance and maintainability. Leveraged Haskell and yaml for configuration and functional programming, emphasizing performance optimization, refactoring, and robust build system management to support reliable development and streamlined package integration.