Wordpress Website Speed Optimization

I'm looking for an expert to improve the speed and performance of my website, giskernel.com. The main areas needing attention are:

- Page Load Time
- Server Response Time
- Image/Media Optimization

Ideal skills and experience:
- Proven track record in website speed optimization
- Familiarity with performance testing tools like Google PageSpeed Insights, GTmetrix, or Pingdom
- Experience with image and media optimization techniques
- Knowledge in reducing server response times

Please provide a portfolio of similar projects completed and any relevant certifications. Thank you!