I recently did a round of interviews at various AI companies, including model labs, coding assistants, and data vendors. My first takeaway is that, wow! the interviews are very hard, and the bar is high. Second, these companies are all selecting for the top 0.1% of some metric - but they use different metrics. For example, the coding assistant interview focused on writing (what I felt was) an insane volume of code in a short period of time. I did not do well. By contrast, another company asked me to spend a day working on a particular niche optimization problem; that was the entire interview loop. I happened to stumble on some neat idea, and therefore did well, but I don't think I could reliably repeat that performance.
To reiterate - wow! the interviews are hard, every company is selecting for the top of a different metric, and there's really no shame in not passing one of these loops. Also, none of these companies will actually give you your purpose in life, your dream job will not make you whole:-)
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