Julia Molin worked on the facebook/buck2-prelude repository, focusing on porting the Haskell IDE to ensure compatibility and stability with GHC 9.2.4. She updated the build system to exclude deprecated z- packages and introduced a build guard that proactively fails on older toolchains, providing clear upgrade guidance to prevent integration issues. Julia addressed Template Haskell object loading and improved caching of GHC options, enhancing reliability under the new compiler. Her work demonstrated expertise in build system configuration, compiler toolchain management, and Haskell, resulting in a smoother onboarding experience and reduced build-time friction for developers using the updated toolchain.