E-commerce Site for Digital Test Series

I'm seeking an experienced web developer to create an e-commerce platform for selling digital test series.

Essential Features:
- User accounts for personalized experience
- Secure, seamless downloadable product delivery
- Subscription plans for series access

Ideal Skills and Experience:
- Proven e-commerce development expertise
- Strong background in digital product delivery systems
- Experience implementing subscription models

Please provide examples of previous work and a brief outline of your approach.