Not a dev, but as someone who has used shopify and set up many of the wordpress ecommerce solutions - I have strong opinions on the UX of ecommerce. Let me know if I can help.
On first stages we will be targeting the business logic side of the equation, but we're completely open for collaboration. We are in Gitter and google groups, feel free to join us. You have the links in our homepage: http://swingcommerce.org