Custom PHP WordPress Site Development

I'm seeking a skilled developer to create a fully customized WordPress website using PHP. This is for my existing business.

Key requirements:
- Extensive experience with PHP and WordPress
- Ability to create custom themes and plugins
- Strong understanding of website security and performance optimization
- Responsive design for mobile and tablet compatibility

Ideal Skills:
- PHP, WordPress, HTML, CSS, JavaScript
- Experience with MySQL databases
- Familiarity with SEO best practices

Please provide samples of previous work and a timeline for completion. Looking forward to your proposals!