Why do companies choose contractors over FTE? Sometimes it’s just because it’s temporarily addition to the work force. If they are vetted and trained like FTE, great. Sometimes the difference is just how you get paid and it doesn’t matter

Sometimes though companies can’t hire FTE so they bring in a of contractors (or outsource), vet and manage them poorly, or give them controversial projects and then they have to lean on the FTE. Also they are often not on call.