Rachel Ma contributed to the haskell-language-server and haskell/cabal repositories by developing features that enhance Haskell development workflows. She expanded Cabal support in the HLS Cabal plugin, implementing autocompletion for autogen-includes and autogen-modules across all cabal stanzas, which streamlines editing and reduces configuration errors. Her approach involved introducing new completer functions and comprehensive tests to ensure correctness and resilience. In the haskell/cabal repository, Rachel added NFData instances to enable reliable data serialization for HLS plugins, improving integration and stability. Her work demonstrated depth in Haskell, IDE development, and the Language Server Protocol, focusing on robust, maintainable solutions.