Comment by FeistyOtter

It is an interesting (but probably very subjective) observation that the majority of companies with a rare or esoteric stacks hire only experienced devs with the stack and refuse to train them themselves. Maybe it is because they are smaller and lack resources. And on the contrary, in my experience, large companies based on common languages like Java, C#, JS and the like dedicate huge resources for training their junior programmers from the grounds up.