I left government four years ago. In my position as clerk, I had no line of sight to contracting other than contracting that was done by the Privy Council Office, which I had to sign off on from time to time. We had some technology contracts to improve business processes and IT at Privy Council Office.
Contracts are let by any of the 300 federal organizations and the day-to-day supervision of them is usually done by middle managers like directors general, directors and assistant deputy ministers.