FB ads media buyer

I am hiring a Media Buyer to run FB ads for clients In my agency.
You should know how to run Ads and should haev previous experience. You should also have the proof of the work you have done before. You should know how to make creaties and handle the ads and genrate good ROAS for the client. I will be working with clients In ecommerce and info-products. So I will prefer the people having experience in the ecommerce niche.