We've worked with: 
We've been hard at work building on Drupal 8 for almost a year now, learning the new framework, developing custom modules, and deploying production-ready client sites.
While a lot has changed in Drupal 8, the core features and functionality will be familiar to most Drupal site administrators and end-users. Although the code under-the-hood is drastically different, the primary interface elements and language constructs retain enough continuity to make the transition a painless one.
If you're interested in working with our Denver-based team on a Drupal 8 build or have custom module or migration projects, we'd love to partner with you! Depending on your project needs, Drupal 7 could still be a good fit, we'd love to discuss which tools are best suited to your project.