I think the sentiment behind this is partially true, but not all the way. Being a developer isn't only about producing high-quality code, a big part of it is mentoring others. As someone on twitter said the other day, the most important product of a senior developer is more senior developers. Being able to mentor others is as important as churning out code.
Additionally, expertise in one framework definitely does provide some additional experience in others. When you're good at any programming language, you will be better at another than a novice.
Saying that there is no such thing as senior developers invalidate the skills that those people have.
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I think the sentiment behind this is partially true, but not all the way. Being a developer isn't only about producing high-quality code, a big part of it is mentoring others. As someone on twitter said the other day, the most important product of a senior developer is more senior developers. Being able to mentor others is as important as churning out code.
Additionally, expertise in one framework definitely does provide some additional experience in others. When you're good at any programming language, you will be better at another than a novice.
Saying that there is no such thing as senior developers invalidate the skills that those people have.