Designed and implemented an audit logging system in PHP to record all database modifications performed through a RESTful API, ensuring traceability at an audit level, including change details and responsible users, using SQL-based persistence. Collaborated in the design, development, implementation, and documentation of a RESTful API, integrated into the company’s core system and prepared for commercial distribution to clients. Developed and executed unit tests using PHPUnit to validate API reliability, data integrity, and business logic, reducing potential defects during development. Performed code refactoring on the core application to improve code readability, maintainability, performance, and scalability, following clean code principles and best practices.