Leo contributed to the ethereum-optimism/superchain-ops and base-org/contract-deployments repositories by building and refining deployment documentation, validation workflows, and signer funding processes for Ethereum-Optimism and Base Mainnet upgrades. He consolidated simulation, validation, and signing instructions, restructured technical documentation, and introduced artefact tracking to improve upgrade transparency and reduce operational risk. Using Solidity, Shell, and YAML, Leo implemented Makefile-driven workflows for signer funding and contract deployment, updated contract address records, and enhanced process traceability with Ethereum transaction links. His work demonstrated depth in deployment management, DevOps, and smart contract operations, focusing on reliability, clarity, and governance in blockchain upgrade cycles.