It sounds like you've had some bad interviews - that is, that your interviewer did a poor job. Small nitpicks should not disqualify you, small mistakes should

It sounds like you've had some bad interviews - that is, that your interviewer did a poor job. Small nitpicks should not disqualify you, small mistakes should not disqualify you. In fact small mistakes are expected and can be used as part of the interview to see if the interviewee can identify their mistakes when hinted at. I've never been required to know a particular platform before. I HAVE been asked to do a small API project in Go prior to the interview, which is similar, but it was an excellent take home problem in scope and completeness. Something like a TodoMVP in React. Something that doesn't require mastery, they just want to see that you can do something that takes more than an hour. It is reasonable for a company to decline to hire if they cannot afford for you to train in a new technology on the job. But this is a failing in the company and NOT a rejection of you.