voip calling and text, video app. front and back end

I AM LOOKING FOR A DEVELOPER WHO CAN FOLLOW INSTRUCTIONS AND WHO WOULD DO THIS AS A PROJECT BUT MUST BE WILLING TO WORK FULLTIME IF NEEDED WHEN PRODUCT IS RUNNING LIVE. This project would NOT be paid by milestonesn because 99.99% of the project is 0 to me and GARBAGE. So if you are one of those scammers looking for money upfront, stop reading now. I rather over pay than prepay a single penny App must work on devices with or without a sim card. We have to utilize the end to end encryption so there is no load on our network for file transfers/pics/images /video calling or anything like that, all that would we directly between the users setup and records of of the activity being on our network, so we can tell what a user is doing in realtime from admin Basicall its almost all P2P . This project would be developed using Technology such as NODE.js/ React native app and react native web When building the app like whatsapp we need to make sure that all in network calls stay on the app server , we a place on the admin to add all the millions of numbers we have in our network now and the ability to keep adding to the list very easily. Any calls that are going to numbers this are not on our network would be routed to one of our network switches. . Calls coming from other networks to app customers would be routed from our network switches to the app server. System must be configured to run on multiple servers for scalability and redundancy to handle over 500 million users P2p Network Basically all in network activity would be P2p All voip calls, video, file sharing, pic, everything All video calls woukd remain between the app users .with just the vcdr staying with us. We have to make sure the video quality is excellent even with very very low bandwidth Our admin /management system must be extensive and very detail A rotating banner ads system would be added to the product( to be discussed before adding) Here is our old app on android, it shows the watermark and a rotating banner ads [login to view URL] I would like to keep [login to view URL] We will be implemented is a self-destructing message feature Voice calling (Major feature of this app) To be up to date and to attract more users, we are going to assign a dedicated phone number to every registered user so they can call orher app members or other non app numbers, they would also be able to receive call from any phone or device including mobile and landline phones We can use the PJSIP library to implement Voice over IP (VoIP). This is an open source multimedia communication library written in C. The library uses a high-level API by combining the SIP (signaling protocol) with the multimedia framework and NAT traversal functionality. This API is suitable for all types of systems including mobile handsets. Group video chatting (one-to-one and multi-user communications Users would be able to video chat 1on1 or in a group of up to 250 people YOU WOULD USE WHATSAPP AS AN EXAMPLE SINCE WE WOULD DO EVERYTHING 100% AS THEY ARE DOING NOT 99% BUT 100% PLUS ALL THE THINGS WE ARE ADDING. Skills Required Java, Mobile App Development, iPhone, Android, Objective C