E-commerce Consulting Website Development

I'm looking to create an e-commerce website to sell consulting services. I need a platform that is user-friendly, professional, and capable of handling transactions securely.

Key Requirements:
- Service listings with detailed descriptions
- Secure payment gateway integration
- User account creation and management
- Search functionality
- Mobile-responsive design

Ideal Skills and Experience:
- Strong background in e-commerce website development
- Proficiency in payment gateway integration
- Experience with user interface/user experience (UI/UX) design
- Knowledge of mobile-responsive design principles
- Familiarity with SEO best practices

Please provide examples of previous e-commerce websites you've developed.