Admob integration on app android (Budget in 10 - 15usd)

I am looking for a skilled developer to integrate Admob into my Android app. The primary goal of the app is to increase user engagement, and I would like the ads to appear every few interactions. I prefer all three types of ad format: Banner Ads, Interstitial Ads, and Rewarded Video Ads. The ideal candidate should have experience with Admob integration and be able to implement it seamlessly into the app. Additionally, they should be able to optimize the ad placement for the best user experience while still achieving the desired revenue.