Interview consisted of 4 parts. 1. Introduction phone interview. 2. Phone interview with one Mechanical Engineer. 3. A at home design challenge, 4. In person 3hr interview with multiple Mechanical Engineers and a 2nd design challenge after a detailed review of my first design challenge. Interview went well with lots of typical questions you would normally hear, nothing out of the unusual. References were not necessary due to the detailed performance assessment during the final interview process.