1. Be there.
2. Be welcoming.
3. Be patient.
4. Make sure they're recognized.
5. Be a DNS server. They don't know to go or who to ask, you'll be asked for a "who...?" a lot. Documentation helps, but is rarely 100%.
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Your work comes second.
Ideally, pair on things to do both.
YOU NEED THE BACKING OF MANAGEMENT/PM/ETC. ON THIS.
The last part is critical. It's a marathon and you're supposed to be investing. Don't sacrifice tomorrow to ship something today.
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The org needs to make it a priority if they're serious about it. And if they do, it'll pay dividends.
#DevDiscuss
I consider myself a terrible mentor because I never have enough time to do it well. Advice on the fly is as good as time allows the last few years.