Black Antelope is a digital creative agency in the San Francisco Bay Area that specializes in Drupal, including custom design, custom workflows and modules, multi-site and multi-language sites, and social applications.
We have extensive experience with integrating 3rd party services such as Salesforce and Marketo, as well as experience designing and building custom APIs within Drupal. Some of the sites we've worked on have required a hefty amount of data migration, and so we have a lot of experience with writing scripts from any kind of database into Drupal.
One of the things Acquia is great for is the tight Varnish integration, and we have a lot of experience setting up and optimizing sites to utilize it.
Some other things we do a lot of are information architecture, interaction design, custom database design in MySQL and MongoDB, geo-spatial indexing for location-relevant applications, e-commerce, responsive web design, and Sass and Compass.