Vitali Raikov developed the Changed Files Detector GitHub Action for the Automattic/vip-actions repository, focusing on optimizing CI workflows by detecting file changes and applying allow or deny patterns to skip unnecessary builds. Using Bash, YAML, and shell scripting, Vitali implemented pattern matching logic to ensure only relevant changes trigger CI processes, reducing compute time and accelerating pull request feedback. He also addressed a bug related to the mapping of detection results to action outputs, improving the reliability and stability of the action. This work demonstrated a practical approach to CI/CD efficiency and robust automation within a collaborative development environment.