I submitted a cover letter along with my resume and heard back from HR after 1 month. There were 3 interviews total. The first, was a 30 minute phone call with HR to gauge my interests and abilities, whom was very kind. Next, I had a video interview with the business development manager and accounts coordinator for about 30 minutes each. And the final, third interview was in-person which included meeting and speaking 1 on 1 with the managers and engineers of the company, followed by a plant tour.