I write tutorials on my blog at www.lankydan.dev . During the day, I am a Platform Engineer at r3 where I work on Corda, an Open Source DLT/Blockchain Platform.
This might not answer the question directly, but my blog has definitely helped me out in this aspect.
It shows that you are one, capable to write something and two, able to talk and explain it.
Otherwise, OS projects are always good. Especially if you can find an inclusive community to help you out. You'll probably learn a lot more than you expect that way.
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We're a place where coders share, stay up-to-date and grow their careers.
This might not answer the question directly, but my blog has definitely helped me out in this aspect.
It shows that you are one, capable to write something and two, able to talk and explain it.
Otherwise, OS projects are always good. Especially if you can find an inclusive community to help you out. You'll probably learn a lot more than you expect that way.