Who manages Apex servers?

Can you tell me, who exactly is responsible for overseeing and managing the Apex servers? Are they an in-house team or do they outsource this management to a third-party vendor? It's important to understand the level of control and expertise involved in managing these critical systems, especially given the sensitive nature of the data and transactions that they handle. Can you provide any additional insights into the measures they take to ensure security, reliability, and performance of the Apex servers?