Developed and delivered a robust timestamping feature for local attachments in the nextcloud/mail repository, focusing on enhancing data integrity and auditability during attachment creation. Leveraged PHP for back end development, introducing time abstraction by injecting the ITimeFactory dependency into the AttachmentService to accurately set createdAt timestamps. Emphasized test-driven development by updating both unit and integration tests, including mocking ITimeFactory and ensuring reliable test coverage across environments. This approach improved the reliability and maintainability of the codebase, ensuring that attachment creation events are consistently tracked and validated. Demonstrated strong skills in dependency injection, integration testing, and PHP-based back end engineering.