James Marsh focused on stabilizing zero-knowledge parameter handling in the zama-ai/fhevm repository, addressing compatibility with the tfhe-rs 0.11.2 update. He migrated the parameter type from CompactPkePublicParams to CompactPkeCrs, ensuring seamless integration with the new tfhe-rs version. Working primarily in Rust, James resolved build issues introduced by the dependency upgrade and enhanced the build pipeline to support robust parameter processing in both production and test environments. His work demonstrated depth in cryptography, build systems, and dependency management, delivering traceable, production-ready changes that improved the reliability and maintainability of zero-knowledge proof parameter handling.