E-commerce Website Development for Diverse Products

I'm seeking an experienced web developer to create an e-commerce website. The site will be primarily used to sell a variety of products directly to customers, including electronics, dog food, home appliances, and more.

Key Requirements:
- User-friendly interface
- Secure payment gateway integration
- Mobile-responsive design
- SEO optimization
- Option to add more product categories in the future

Ideal Skills and Experience:
- Proven track record in developing e-commerce websites
- Strong understanding of SEO and UX/UI design
- Experience with secure payment integrations
- Knowledge of inventory management systems (for future reference)

Please provide a portfolio of similar projects.