During June 2025, Chadd delivered two features focused on observability and type safety across the paritytech/foundry-polkadot and ChainSafe/lodestar repositories. He enabled default contract metrics visibility in test environments by updating invariant configuration, improving feedback loops for developers. In ChainSafe/lodestar, he refactored Merkle branch type definitions for the Light Client, standardizing SSZ representations across multiple Ethereum forks to reduce risk in Merkle proofs. His work involved Rust and TypeScript, leveraging skills in data structures, configuration management, and testing. These contributions enhanced maintainability and consistency across codebases, demonstrating depth in cross-repository collaboration and a strong focus on robust engineering practices.