Interesting, considering that Anthropic spends a lot of resourced to build ethics checks into their AI. I wonder if this hiring process was ever put through its own ethics check.
When you apply, you have to confirm that you did not generate the application with AI. As soon as you send of the application, you get an automatic email confirming your application. They also say they don't reach out, if you are not a good match and that they only contact the people they want to hire. Maybe they changed their mind on that policy, because I received a rejection letter a few months later. It was very well written. The people I showed it to said it is one of the nicest rejection letters they have seen.
There's no ethical principle which requires them to hire somebody if they use OSS from that person. Maybe they missed out on a good hire, c'est la vie.