I applied online. The process took 3 weeks. I interviewed at AIR Worldwide (Boston, MA) in Aug 2019
Interview
Phone screen, phone interview, writing/comprehension test, on-site interview. The writing test was pretty straightforward. Edit an article written by a non-native English speaker, and answer some questions about the data provided.
Interview questions [1]
Question 1
There weren't so much set questions. It was more of a conversation about the job and my background. I did get a bunch of questions about my interest in science.