Step 1: Reference calls
Three or more named customers with introductions. Use the 12-question reference-call template. Ask about cost overruns, team continuity, and rehire intent.
Step 2: Working example demo
Live demo of an existing client deployment. Not slides, not videos, not screenshots. A live system you can interrogate.
Step 3: Named engineers
Demand to know which engineers will work on your project. Get key personnel clauses in the contract so the team is contractually obligated to stay.
Bonus: Run the scorecard
Run the 12-Point AI Vendor Trust Score on the consultant. The verdict + customised questions list will surface anything you missed.