The whole process took quite a while as there was a long time between initial contact and getting paperwork. Their HR department seemed to be swamped with applications and they were unable to process them very quickly. The process as a whole was nerve racking because they played it close to their belt and didn't let me know about their decision until much later.

I applied online. Contacted by HR to come to Columbus for Mast Global day (10 different Mast Global internships so your questions can vary). Brief slideshow about company followed by a 30-minute interview. Some technical questions, mostly behavior to see if you fit team. Group did not seem like they had interviewed before and seemed very disinterested in being there.