During a two-month period, Einar contributed to the okx/optimism and op-rs/kona repositories by focusing on foundational improvements in code quality, documentation, and CI/CD workflows. He refactored core data structures in Rust, such as renaming BlockNumberHash to BlockNumHash, to align with domain terminology and enhance maintainability. Einar also improved documentation and metadata accessibility, streamlining onboarding and future development. In November, he optimized CI pipelines using GitHub Actions and Bash, introducing parallel test execution and centralized artifact management. These changes reduced CI run times, standardized reporting, and improved debugging, demonstrating depth in testing automation and cross-repository workflow design.