flutter mobile app backend using firebase and dart

I'm looking for an experienced developer to create a mobile app backend using Flutter and Firebase, it's basically a social media , Firebase is my preferred backend system, as it offers advanced features such as real-time synchronization and data replication. As for plugins and services, I'm open to suggestions – but I'm considering utilizing some custom plugins or services for the best performance and functionality. On top of that, I need authentication and permission rules to be set up for the mobile app in order to protect user data and maintain safety, and creating a blockchain for the social media , i already did the front-end and i need implementation of backend and business logic , If you think you're capable of completing this project, please apply for this job. I look forward to hearing from you!