They do an online interview over Zoom once, where they ask you general interview prep questions and other questions about your resume. They then invite you for an in-person interview and make you take a small math test alongside it. The whole process takes months. They sent me an email saying they liked me. Then 3 months later, when I had already gave up hope, they emailed me asking if I was still open to working there since they were still deciding. Never got another email since.