E-commerce Store Development on Magento

I'm looking for an experienced web developer with a strong background in building e-commerce sites specifically on the Magento platform.

Key requirements:
- Comprehensive knowledge and experience in Magento
- Proven track record in developing user-friendly, secure, and fully-functional e-commerce stores
- Ability to incorporate SEO principles and responsive design

Please provide examples of your past Magento e-commerce projects.