Adsense Loader Integration

I need an experienced developer to integrate Adsense loaders for banner ads on my website. The ads need to support the following sizes:

- Leaderboard (728x90)
- Medium Rectangle (300x250)
- Skyscraper (160x600)

Ideal skills and experience include:

- Proficiency in web development
- Experience with Google Adsense
- Knowledge of ad integration and loading techniques
- Ability to ensure smooth user experience and fast loading times

Please provide examples of similar work done.