Joshua Gutow contributed to ethereum-optimismhub.io and flashbots/rollup-boost by expanding testnet support and automating deployment workflows. He integrated the Unichain Sepolia testnet, updating network configuration to enable seamless interaction with new chain IDs and RPC endpoints. In flashbots/rollup-boost, Joshua implemented multi-architecture Docker image builds using GitHub Actions, ensuring consistent deployment across amd64 and arm64 platforms. He also improved documentation in ethereum-optimism/docs, correcting upgrade schedule details to prevent miscommunication. His work demonstrated depth in CI/CD, Docker, and TypeScript, focusing on environment parity, automation, and clear upgrade communication, which collectively enhanced reliability and developer experience across these repositories.