You need a person with two kinds of expertise:
1. Who can run meaningful traffic to your website
2. Who can read user behavior while this meaningful traffic is browsing your website
Let me elaborate, driving traffic to a website is easy in a way but you want potential customer flow and exclusion of random traffic. So, target audience profiling is critical.
Secondly, user behavior will clearly suggest which company is someone is looking at. You want to sell banana to someone who has been checking different bananas in the market.
Someone who keeps a tight marketing cycle, hire them.