Developed and delivered an Apple Reminders CalDAV integration for the go-vikunja/vikunja repository, enabling seamless synchronization between Apple Reminders and Vikunja. Focused on backend development using Go, the work allowed Apple Reminders to discover and utilize the /dav/projects/ path as the home set, while maintaining the existing principal-based authentication and task exposure flow. Addressed and resolved CalDAV discovery URL handling issues to improve compatibility with iOS and macOS platforms, thereby reducing user friction during setup. Leveraged expertise in API development and CalDAV protocols to enhance integration reliability and user experience, with all changes implemented over a one-month period.