E-commerce WordPress Development (Urgent)

I'm looking for an experienced WordPress developer to fix my current site issues urgently.

Essential Requirements:
- Must be built on WordPress
- User-friendly interface
- Secure payment gateway integration
- Mobile-responsive design

Ideal Skills and Experience:
- Proficiency in WordPress and WooCommerce
- Strong experience in setting up e-commerce functionalities
- Knowledge of SEO best practices
- Ability to customize themes and plugins

Please provide examples of previous e-commerce sites you've developed and your approach to ensuring security and usability.