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I think it's also important for seniors to look at new ideas at a regular basis. People who don't, tend to overrate the "good old [insert language/framework here]". You should not stop improving yourself, just because you are already able to get stuff done. (Example: Java introduced lambda functions in Java 8 and many Java seniors are still not using them)



I think the difference a senior person can make is to see what things the new language/framework/paradigm still doesn't solve and think of ways to evaluate their risk to a particular project's requirements and how to mitigate that risk. Things like downtime for upgrades or migrations, handling dependencies on ecosystems of community developed libraries without quality and feature change controls, the ability to update the system when it's been in production for 3 years and see few changes have been made and the original developers have all moved on, etc.




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