Worked on the prometheus/prometheus repository to enhance the reliability of PromQL duration handling and improve the CI/CD pipeline. Addressed a bug by implementing strict validation for duration expressions, ensuring that NaN, Inf, and out-of-range values are rejected and clarifying parser rules to prevent silent errors in queries. Added regression tests and updated release notes to document these changes. Automated the retriggering of continuous integration on new commits, which ensures that the latest code is always validated before deployment. Utilized Go for backend development and continuous integration tools to reduce operational risk and accelerate feedback for the engineering team.