Moderate Wordpress Theme Design Customization

I'm seeking an experienced WordPress developer to customize the theme of my existing website. The focus will be on modifications to the homepage layout and templates.

Key requirements include:
- Adjusting layout and templates for the homepage
- Ensuring the new design is responsive and mobile-friendly
- Maintaining or improving site speed and performance

Ideal skills and experience:
- Proficiency in WordPress and theme customization
- Strong understanding of layout design and templates
- Experience with responsive design and site optimization
- Good communication skills for discussing changes and updates

Please provide examples of previous work.