What I’m about to say might come off as smug. I don’t mean it to be a flex, it’s just for context.

I’ve been programming since i was 6 years old, and have 26 years of continuous professional experience. 30 years of open source contributions. You are almost definitely interacting with code I wrote on a daily basis.

7 years ago I was caught up in a round of layoffs and I was scouting around for jobs. I got an interview at a startup - it wasn’t a huge tech challenge, but I needed a job.

I did an initial technical interview with the tech lead for the company. All went great. I did a “final HR interview” , again great. Then the CTO stepped in and said that he would need me to complete a coding test before I could be hired.

I failed that live coding test despite producing code that outperformed the code in the “correct” solution by several orders of magnitude.

The CTO was clearly upset by my solution, which he got very angry about and insisted was wrong, without explanation, and despite it beating the spec and passing all the predefined tests.

2 days later the tech lead, who was also present in the test, told me there was nothing wrong with my code. Better still they had actually taken it and put in into production in place of the code that CTO had written, and which was the basis of the “correct” solution.

He also told me that he’d quit after an argument with the CTO about this and asked if I found a good place to work, if I’d let him know.

Sometimes tests are not about what you can do, but how smart they make the person testing you look.