[joelbluminator]

Think about young startups that aren't sure when the next round of cash will come and their personnel stay there on average 2, 2.5 years. Spending 6-8 months on getting a new developer productive with a new language is super expensive for such a company. In fact, employing juniors in general is pretty risky for such a company.

[paublyrne]

A senior developer though should be able to get productive with a new language in a few weeks. It's not such an investment ....

[joelbluminator]

Sorta true, often times not really. You can ship code that most likely works, but I'd still prefer a senior who knows the stack over you if I was the founder. You're saying in depth knowledge of a framework / language counts for nothing?

[ativzzz]

Of course, the startup is doing what it takes to survive. I'm not saying this approach is wrong in any way. I'm just saying that this will result in these niche stacks staying niche and have a much smaller dev pool to hire from, now and in the future.