Worked on the square/wire repository to enhance Swift protobuf runtime by adding support for google.protobuf.Struct, Value, ListValue, and NullValue. This involved implementing handwritten Swift types and updating the code generator to map these well-known Protocol Buffers types to their Swift equivalents, ensuring compatibility with both binary and JSON (Codable) serialization and deserialization. The work addressed compile-time failures by marking message-typed fields as optional, resulting in cleaner builds for Swift users. Leveraging skills in Swift, Protocol Buffers, and JSON serialization, the changes improved interoperability and reliability for developers working with well-known types in the Swift runtime environment.