Worked on the matter-labs/block-explorer repository to enhance CI/CD security and pipeline reliability by pinning all GitHub Actions to immutable commit SHAs. This update covered 14 actions across 11 workflow files, replacing mutable tags to mitigate supply-chain risks and ensure reproducible builds. Incorporated human-readable version comments for improved auditability and traceability, and documented all changes in a changelog-oriented pull request. Leveraged skills in CI/CD, GitHub Actions, and security to align workflows with governance requirements. The work focused on DevOps best practices, reducing risk in the build and release process while improving maintainability and transparency for future development.