I’ve worked as a software developer for 20+ years and have hired others many times. People lie on their resumes to an extent that is difficult to believe until you see it. Sometimes they can talk intelligently about coding in a way that can get them through a “talk about your history” interview (a good interviewer can usually pierce the lies, but a mediocre or inexperienced interviewer might come out thinking they can code).

It’s very hard to guarantee that every first-round interview includes a seasoned lie-detector. A coding exercise is an imperfect, flawed, sometimes insulting approach that’s better than the alternatives.

When done right, it can be a nice conversation about coding, algorithms, and how to collaborate. And prove that the candidate can code.

Personally, I don’t mind being interviewed with a coding exercise even though I could be many of my interviewers’ parent. I love programming and talking about programming with programmers! And it gives me a chance to interview my potential future collaborators in a setting that’s less structured than a sit-across-the-table Q&A.

In my experience, someone who refuses or takes offense at a well-framed coding exercise is probably not going to be someone you want on your team. By well-framed, I mean introduced in a way that’s not insulting on the face of it, like a multi-hour takehome exercise before even meeting the candidate and talking about the job and why you are interested in them as a candidate. That’s just lazy interviewing and I wouldn’t want to do that either.