We reject more candidates every week than most brands/agencies will reject in a year of hiring for this role.
It's safe to assume that if someone does just 2 things every day - 1) manage 8-figure ad accounts and 2) recruit senior Amazon PPC managers - then they'll be better at hiring for that role than most of the population.
They'll be better than you, the $250k/mo brand owner who's not truly been hands on in ads for 12 months.
They'll be better than the eCommerce recruitment firm who's recruiter has never seen Seller Central, let alone adjusted a bid. "We reviewed these CVs for you and they seem worth a chat - 25% invoice incoming."
They'll be better than your current hire who's been managing Amazon PPC for 3-years now (our team's been doing it 10-years).
They'll be better than your HR team who have absolutely no idea about AMC becoming freely available to all sellers.
They'll be better than me, George Reid, the Amazon agency owner of 8-years, who simply isn't qualified to make a decision on someone's Amazon ad expertise...because I haven't done it every day for a decade.