Application Development Expert Needed

I'm looking for a full-service application development team and experts with experience in this type of app. We need information and cost estimates for systems to set pricing and reduce costs to align with our system's functionality. For example, we need to know the approximate cost per person for a 24/7 usage real-time tracking system. We want to control pricing from the start to avoid losses. Calling and video calling costs are also included in our overall costs. If you have expertise in this area, please submit your application.
What we need:
1. Chat system
2. General friend adding system using codes or QR codes
3. Real-time location tracking (paid) with the ability to enable/disable location and view specific locations with friends
4. Calling and video calling system
5. Text-to-speech conversion (free, with enable/disable option)
6. Automatic messaging system (sends messages within seconds of typing)
7. Automatic chat deletion system with individual settings...