Worked on enhancing F# discriminated union serialization within the dotnet/orleans repository, focusing on expanding support for complex F# data structures. The approach involved adding serialization capabilities for private constructors, named fields, and mutually recursive discriminated unions, addressing scenarios previously unsupported. Comprehensive test coverage was developed, including tests for struct discriminated unions and a variety of DU shapes, to ensure reliability and prevent regressions. The work leveraged F# and C# alongside skills in code generation, serialization, and testing. These improvements increased the robustness and compatibility of the F# serialization pathway, enabling safer interoperability with diverse F# data structures.