The Indeed CM system consists of a set of web services that are deployed at the Microsoft Internet Information Services platform. The system resilience is provided for by IIS capabilities: several servers can be combined into a cluster and work as one, distributing the load between themselves.

All servers are set up to use one and the same data storage and the same user directory (or directories).
The users utilize a single address to connect to the server cluster. Therefore, failure of one server does not affect the system operation in any way.

Useful links describing the load balancing configuration: 
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc725691(v=ws.11)
https://www.iis.net/downloads/microsoft/application-request-routing