Black Antelope is a design-centric and highly-technical digital creative agency that specializes in Drupal. We do a lot of custom design, custom workflows and modules, site, migrations, multi-site and multi-language sites, and social applications. Some of our open-source contributions include modules for Salesforce and Cloudwords.
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 the Migrate module as well as writing tailored scripts to translate date from any kind of database into Drupal.
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, SEO, and Sass and Compass.