E-commerce Website Development for Consulting Services

I'm looking for an experienced web developer to create a custom e-commerce website. The site will be primarily used to sell consulting services.

Key requirements:
- User-friendly interface
- Secure payment gateway integration
- Service listing with detailed descriptions
- Booking system for consultations
- Mobile-responsive design
- SEO optimization

Ideal skills and experience:
- Proven portfolio in developing e-commerce websites
- Strong understanding of UX/UI design principles
- Expertise in payment gateway integrations
- Familiarity with SEO best practices
- Excellent communication skills

Please provide samples of similar work done and an estimated timeline for completion.