No I care more about if the job involves solving interesting/novel problems Languages/OSs are just implementation details to me, I don't get why software engineers (especially junior ones) are so obsessed with them To me algorithms/systems in the abstract sense are the actual interesting part of the job
So you'd be happy working at a place that required all code to be in brainfuck? That choice of computer language is "just an implementation detail" and you can still solve your interesting abstract problems in it so you should be happy with it.
I don't know what you're talking about, what company uses that language?