In a culture of yes, look for no.

In an honest effort to please (and get business), an offshore team may commit with enthusiasm to what they simply cannot deliver.

So, look for no. Find a company who tells you what they do, not what they can potentially do. If you need a hammer, find a hammer. Not a screwdriver that is willing to grow a hammer out of its side. Trust me, someone is working on the hammer you need. And, when you’ve found the right team, first make them prove they can do what you need. If they really want the job, they will.