I had a great interview while at Shoptalk 2016 with Dirk Hoerig, CEO of commercetools which is an enterprise e-commerce platform based in Germany and just expanding into USA. commercetools describes itself as a "Commerce-as-a-Service for growth-minded retailers and manufacturers". A key differentiator between commercetools and other commerce platforms is that through its API-first principle its highly flexible and a great fit for new e-commerce approaches such as microservices.