epub fixed up

I am looking for a freelancer who can fix the formatting errors in my epub file. There are specific design elements that I would like to retain in the fixed version. Additionally, I would like the freelancer to validate the epub file using an epub checker.

Ideal skills and experience for this job include:
- Proficiency in fixing formatting errors in epub files
- Knowledge of design elements in epub files
- Experience with validating epub files using an epub checker