I interviewed at Duolingo in March 2016.

I applied online, and the process took about three weeks. The recruiter contacted me to set up a phone interview within the week. I had a second phone interview within a few days of the first. Finally, I scheduled an onsite interview two weeks later.

The phone screens were both with engineers and were almost entirely focused on solving a problem in an online code editor. The onsite consisted of two whiteboard interviews and a pair programming exercise.

My recruiter responded to all emails and interviews within hours, if not minutes. All of my interviewers were very laid back, and the environment was not intimidating. I ate lunch with the team and met people at all levels of the company.

I was asked to code a function on a whiteboard in a language of my choice. It didn't test any algorithmic knowledge or deep thinking, but general programming ability.

Questions about algorithms on strings, not requiring code.

During the pair programming exercise, I was asked to edit a large library of code in some very simple ways.