Worked on the Particular/NServiceBus repository to enhance the XML serializer by adding support for modern date and time types, specifically DateOnly and TimeOnly. This involved implementing explicit type handling and introducing a dedicated valuetype branch to improve clarity and reduce edge-case risks. The approach emphasized robust unit testing in C#, with comprehensive round-trip tests to ensure correct serialization and deserialization of these types. Additional efforts included code quality improvements such as removing unused usings and refining formatting. The work focused on expanding XML serialization capabilities while maintaining reliability and test coverage, leveraging skills in C#, unit testing, and XML serialization.