The entire interview process roughly lasted just under two weeks. I applied through the company website, where, in addition to the normal application questions, you are asked to answer one publishing related question - "where do you see scientific publishing in 10 years?"
I was emailed the next day to arrange a video interview with the HR. The video call lasted roughly 20 minutes and she asked quite general questions, mainly about what I knew about the company and the role. She was very friendly and at the end gave some tips about what to work on and what to expect if I am called back to the second round. I was also given 3 questions which I had to answer and email back that day, mainly relating to scientific publishing and what makes Frontiers unique from other publishers.
I was emailed the next day and invited to a face-to-face interview at the office. I went in and spoke to one of the Team Leads as well as a manager who was joining in remotely via video chat. The interview lasted approximately an hour and consisted of questions regarding the company history, the role and then more specific questions about myself and my experience. At the end, I had two short written exercises to do on the computer - a proofreading task and drafting an email talking about the company.
I received another email from HR asking to arrange another video call. This was to discuss feedback on the interview and my eventual job offer.