Open Source Ticket Management System Development

I'm seeking a developer who can create a customizable, open-source ticket management system for me. The software should support both the manual entry of client data and the uploading/exporting of .xlsx files. It must also be able to notify users via email and in-app alerts when certain milestones are reached.

Key Requirements:
- The system should allow for moderate customization of user data fields.
- It must support client data reporting as well as the ability to delete data.
- A user-friendly interface for managing the ticket system is essential.

Ideal Skills:
- Proficiency in developing with open-source software.
- Experience creating ticket management systems.
- Excellent understanding of .xlsx file integration.
- Familiarity with designing customizable software.

Please include in your application:
- A detailed project proposal.
- Links to similar ticket systems you've developed in the past.
- Your recommendation for an open-source ticket system that would be best suited for this project.