Anyone that is worth their weight in salt would certainly not be available "immediately." And anyone that is sitting around and available "immediately" most likely is not a very good developer and is not functioning effectively at a Corporation-to-Corporation level.
To demonstrate "great" customer service, one should be looking to find the "best" candidates, not simply someone that is available.
Alessandra Da Cunha
Joined: Jul 26, 2011
Most of the time, there are companies that have developers sitting on a banch because they are between contracts.