I interviewed at RV years ago for a backend position. During the interview I was told they didn't think I was sure if I wanted to work backend, frontend, or devops (I'm pretty sure devops wasn't the popular term back then...just can't remember what it was). They couldn't give me an explanation to why they thought that. Only thing I could think of is the different tech/prev positions I had on my resume. I guess I would of had more luck now since companies like full stack engineers(I don't know if that is still the trend). Also I too left the interview having no clue what they did. Glad I didn't get the position since I've know so many engineers complain about the place. Also I ended up finding a great job and coming up on my 10th year anniversary.