The company website doesn't appear to have any internship opportunities posted. I gave my resume to a representative from Opto 22 at a school career fair and was contacted a few days later by the company for an initial phone screening with the VP. The phone screening consisted of two portions: behavioral/resume-related questions and then technical questions to gauge your level of understanding. The technical questions will be customized according to your resume. Most of the questions have a follow-up question as well. There are probably more interviews (potentially on-site) if you pass the phone screening, but I did not make it that far.