Traffic Manager - Traffic Buyer Expert

Hello, I am looking for someone who is expert in buying traffic from various sources including but not limited to:
- Google AdWords
- Facebook Ads
- Popups / Push Notifications
- Cheap Traffic Sources
- Traffic Marketplaces like - Buysellads etc

I am looking for someone with extended knowledge in the field so please explain what is your knowledge and how long you have been doing this!

PROVEN PREVIOUS KNOWLEDGE IS A MUST