Website Optimization and Repair

I need a skilled web developer to optimize and fix 2-5 of my websites that are currently down.

Key Requirements:
- Troubleshoot and resolve issues causing pages not to load.
- Enhance website performance to prevent future outages.
- No specific error messages are showing, indicating a need for in-depth inspection.

Ideal Skills and Experience:
- Strong background in web development and troubleshooting.
- Experience with optimizing website performance.
- Ability to work on multiple sites simultaneously.
- Problem-solving skills and attention to detail.

Please provide examples of similar work done and estimated timelines.