Becoming complacent with your job or knowledge. I've seen many senior developers that get comfortable maintaining some system they built. Software development and technologies are constantly evolving, don't get left behind!
With that said, that doesn't mean you should learn every shiny technology that comes out. But it does mean that you should aim to learn the fundamentals and pick up the latest tools at least every couple of years to stay relevant.
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Becoming complacent with your job or knowledge. I've seen many senior developers that get comfortable maintaining some system they built. Software development and technologies are constantly evolving, don't get left behind!
With that said, that doesn't mean you should learn every shiny technology that comes out. But it does mean that you should aim to learn the fundamentals and pick up the latest tools at least every couple of years to stay relevant.