Andrew Gartner worked on optimizing the Cosmovisor auto-download process in the cosmos-sdk repository by removing a redundant validation step, which previously caused duplicate binary downloads during upgrades. This change improved upgrade efficiency and reliability by ensuring only necessary binaries are fetched, streamlining the Cosmos upgrade workflow. In parallel, Andrew updated the zeta-chain/docs repository, enhancing documentation to clarify TSS direct deposit support as Ethereum-only and adding detailed sections on the Call functionality and E2E development environment. His work leveraged Go, Markdown, and DevOps skills, resulting in clearer developer guidance and reduced operational overhead for cross-chain deployment and integration scenarios.