My current employer allows us to be "available" sometimes, meaning we are available to anyone who needs help and we learn/try new things during that time. It has helped me learn a lot of new things and many of them helped me in my daily projects.
We also have devs meetings every week to show what we have learned/discovered.
This means that our senior devs are still learning new technologies and ideas regularly.
It also means that as a junior I get to show the older devs some new things too!
Sharing knowledge is important. 🙂
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