Serhii Petrov focused on enhancing PHP 8.5 readiness and modernizing CI/test tooling for the phpDocumentor and matomo-org/device-detector repositories. He introduced PHP 8.5 compatibility testing into phpDocumentor’s CI matrix, ensuring the project remains aligned with the latest PHP standards. For device-detector, he updated CI workflows to test against PHP 8.5 and utilize PHP 8.4 tools, refining code quality checks and future-proofing the repository. His work involved editing YAML-based workflow files and updating configurations for phpcs, phpstan, and phpunit. Serhii’s contributions demonstrated solid CI/CD, PHP, and testing skills, focusing on release stability and upgrade risk reduction.