1) What's your experience with xyz marketing (a specific type of marketing)? 2) What strategies do you use to optimize [a certain engagement KPI] and [a certain reach KPI] in this field? 3) Describe challenges you overcame re: these KPIs. Be specific! 4) What types of metrics have you used before? 5) What are healthy metrics to look for when starting a new xyz marketing channel? 6) How did you get into this career? Again, pretty obvious that all but the last question (which was tacked on for the sake of appearance) are pumping applicants for expert advice, minus the consulting fee.