Development of a Tournament App Similar to Challengermode

I need a tournament app similar to Challengermode, but with some important differences. The backend will be in Django and the frontend in React Native. The app will allow only the administrator (me or designated users) to create tournaments, while other users can only participate.

**PLEASE READ THE COMPLETE APP DESCRIPTION IN THE ATTACHED DOCUMENT BEFORE SUBMITTING YOUR PROPOSAL**

https://docs.google.com/document/d/1Hu6pIV0BDnGbCDGmE6N-jk2nFTa4zlnsDMaRXRtSP5o/edit?usp=sharing