Completes an online task (iOS project). The time is kind of open-ended; you have to build the project and submit for review on their website.

I passed this task.

Second stage was a phone screen/coding interview using Coderpad. This was about a week after the project submission.

I was asked some theoretical questions, then proceeded to solve an intermediate, small problem. I don't want to be very specific with the question as I think it's unfair. I can say, however, that I was asked to write a verifier for a popular puzzle game.

What are the advantages and disadvantages of using third-party or open-source libraries?