Worked on the Wunderbyte-GmbH/moodle-mod_booking repository, focusing on backend PHP development to enhance data integrity and user relevance in the booking module. Addressed a key bug by refining the data filtering logic, ensuring that the futuresonly filter in shortcodes applies after evaluating future conditions for more accurate frontend displays. Improved the supervisorTeamReduced scope so that managers now see only users with active bookings, increasing the relevance of displayed information. Maintained clear traceability through detailed commits and emphasized robust backend filtering. The work demonstrated a methodical approach to backend problem-solving using PHP, with attention to both data accuracy and user experience.