Worked on the elastic/apm-agent-php repository to deliver experimental compatibility with PHP 8.5, focusing on extending support for the Elastic APM PHP Agent to run on Alpine 3.21+ while maintaining backward compatibility with earlier PHP versions. The approach involved updating Dockerfiles, refining CI/CD pipelines, and adjusting packaging to ensure reliable builds and smooth upgrades for customers transitioning to newer PHP versions. Leveraged skills in Docker, Alpine Linux, and PHP development, with careful attention to maintainability and long-term support. The work emphasized collaborative delivery and robust validation across multiple PHP versions, reducing upgrade friction and aligning with customer requirements.