Transform Squarespace into E-commerce

I'm looking for an expert to turn my existing Squarespace website into a fully functional e-commerce site. We will be selling physical products, and I plan to list more than 50 items.

Key Requirements:
- Set up e-commerce functionality on Squarespace
- Ensure smooth navigation and user experience
- Integrate secure payment options
- Possibly include inventory management and shipping options

Ideal Skills & Experience:
- Proven experience with Squarespace e-commerce
- Strong understanding of online retail and user experience design
- Experience with payment gateway integration
- Background in inventory management systems is a plus