Custom Digital Product Store Development

I'm looking for an experienced developer to build a custom online store for selling digital products, specifically radio types. The store must include a license key generation feature.

Key Requirements:
- Custom-built platform
- License key generation for digital products
- User-friendly interface
- Secure payment processing
- Mobile-responsive design

Ideal Skills and Experience:
- Proficiency in web development and custom e-commerce solutions
- Experience with license key generation systems
- Strong understanding of UX/UI design
- Knowledge of secure payment gateways

Please provide examples of previous similar work and a timeline for completion.