Hi, I'm a professional full stack web developer. I can help you to build this crypto exchange as I've done this project from scratch.
I have a ready sample of crypto currency exchange platform, it comes along with the admin that you can control all of the setting, native wallet, KYC, etc. I will not reuse the code as we have the NDA before. But I can show you.
This platform will use PHP, Redis as the DB and ofcourse with websocket. I will recommend you to use AWS for the cloud service provider.
Please consider my bid and let's talk more over chat.
Regards,
Teguh