Software engineer & founder of @RailsBridge and @LivableCode. Currently stirring the pot at @SalesforceUX. She/her. 
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I will 80% agree with this. Teaching is a distinct skill, separate from doing. You can be really good at doing but lousy at explaining/teaching. The blacksmithing mentor at my forge, for instance. :-/ It's a skill one should develop, but it's not the same skill.
Absolutely. My contention, however, is that you’re not a _senior_ developer unless you have that skill.
Being able to explain decisions is, in fact, precisely what distinguishes a senior engineer from a mid-level one.
Then we ought to be sending would-be seniors to education classes, too, not just technical conferences. :-)
Hard agree 
Violent agreement!
I agree with that, although I wish the title wasn't handed out so carelessly.
It tends to be used on a local-relative scale, rather than a global-objective scale. That's an inevitable result of rapid growth, little regulation, and an encouraged selfish, libertarian mindset combined with "words mean what they mean to you".
I'm not sure what local-relative means exactly, but if you go into interviews with the title, they'll hold you to their idea of what constitutes Senior. If you got the title because someone left and you were slotted in their position, you're going to struggle.
I totally agree that the title (big-S) Senior Developer does not always mean they’re a (small-S) senior developer. I wish we had better words for this.
Local-relative meaning "senior-most at the company". At my first agency, I was the most-senior dev there within a year after starting due to attrition. I was a total moron compared to where I am now, of course, but I was "senior" relative to everyone else.
I don't think we'll have better words until there is some commonly-recognized industry body handing out certifications that matter. Like "journeyman bladesmith" or "master bladesmith" have very specific ABS tests you must pass. No test, no title.
You beat me to it. If you can't communicate well enough to pass on the info, you aren't a master, you are a skilled practitioner.
Exactly, raw talented devs are not always senior, they have their place, maybe even working alone on improving something specific
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