We're a small web development firm based out of Asheville, NC, working on e-commerce applications since 2010 and we've been developing for the Shopify platform since 2014.
We've built custom solutions for dozens of Shopify stores, including applications and storefront features making extensive use of the full Shopify API and platform functionality, like automated event (webhook) processing, advanced admin management tools, specialized dynamic front-end features, custom shipping (carrier services), complex 3rd party integrations and multi-tenant installable apps.
We've dealt with the nitty-gritty of building robust, effective Shopify solutions, down to optimizing for the API's leaky bucket rate-limit across parallel background workers doing large batch jobs, undocumented API additions and gotchas and "bank-shot" workarounds to tricky platform limitations. If it can be done, we've already done it or we'll figure out how.
We've built our own set of in-house tools to optimize Shopify development, allowing us to deliver on everything from small fixes and tweaks to a storefront to large, complex custom applications.