Hello Dear, Gone through with your requirements, we can make Shopify platform for Web and App with your complete features and requirements.
Do you have any reference links?
We are a team of "DIGIMART" having 6+ years of experience in Web and Mobile design plus development and primarily deal in software services and developer outsourcing according to the customer requirements. Talking about our expertise, we possess very good expertise in PHP, Mobile App Development, iPhone, Android, Software Architecture which seems to be the primary technology set for your project.
Regards,
Steve.