Ceyhun Onur developed full support for named types with underlying basic types in the ava-labs/libevm repository, focusing on the RLPGen code generation layer. He implemented encoding and decoding paths for these named types in Go, ensuring that generated code consistently uses the correct type and improving type safety throughout the stack. His approach included adding comprehensive tests and introducing a dedicated handling file to guarantee correctness and facilitate future enhancements. By leveraging skills in Go, full stack development, and RLP encoding/decoding, Ceyhun’s work enhanced code generation fidelity and maintainability, addressing integration needs for downstream systems relying on robust type handling.