How do exchanges manage their bitcoin/crypto? It only takes 1 employee with private keys to steal it all
Nice question. I assume the following:

Most of the funds are stored in &quot;Cold wallets&quot;.
All the transactions are made from &quot;Hot Wallets&quot;
There is an automatic system that detects that the hot wallets need to be recharged.

I don't think such operations are made by a human. Maybe there is a human who checks such transactions. But everything is done automatically.
We can also assume that the CEO has access to the keys and funds. But we will never be 100% sure. It's crypto. That's why different decentralized platforms like UniSwap are popular right now.