90% of the job I apply for, on Upwork or otherwise, are always looking for an expert in a particular niche technology, and hire only based off that small nugget of information.
I have been doing Elixir full time since 2016, and got a contract with someone that was looking for a Phoenix.Socket expert—a small WebSocket server module part of a larger framework—and the interviewer spent 30 minutes drilling down how much I know that small piece of logic. In this case it's like hiring plumber asking them how much experience they have in square zinc kitchen sinks. Given that I couldn't convey how dumb that is, I had to lie and say that in all of my 7 years with Elixir I have been using Phoenix.Socket pretty much daily. And as expected, it was a bog standard job doing nothing more complicated than an intermediate Phoenix tutorial.
If someone has a lot of experience in databases, and in competitors to ClickHouse they might be good or better than someone that claims to be a world class expert in ClickHouse and nothing else.
(Not to pick on you in particular, but as a true generalist this hiring pattern has been bugging me more and more as my breadth of experience grows.)