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You are probably thinking of this:

https://www.theverge.com/2018/10/10/17958784/ai-recruiting-t...

Yup, that's it, thank you

There is no AI involved in this story.

> potential employees undergo a basic competency assessment in which they are evaluated against 25 desirable attributes for software testers, such as the ability to learn new systems or take on feedback. Following these initial tests, potential staff undergo a week of working from home fully paid.

Well, if you train a ML-based hiring system on the data you have - and all the top performers just happen to fall within a certain narrow group (for example: Male, 30s, White or Asians, College educated, etc.), then that said system will most likely predict similar individuals to be good hires - while radically different will get random, or even negative predictions.

Imagine it as a movie recommender system. If you only watch a certain type of movies, then that system is going to keep recommending similar movies to you.