After a referral from an employee, I had 1 behavioral 30 min interview mainly about my background and projects I worked on. Then I had 1 technical 30 minute interview talking more in depth about my projects. This was for a Summer 2017 Intern position.

Took 2-3 months for HR phone interview where they asked about my resume and a few behavioral questions, next week was a phone interview with hiring manager where a few basic fundamentals were asked (recommend having your resume, job description and pen and blank piece of paper ready) and then scheduled a on-site interview the following month. It was about five hours and was with several people involved in different levels of development.