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> I don't want my employees to have to learn everything just-in-time

What about just some things. And in most cases, it's not learning for the first time but brushing up on the topic. To expect people to have encyclopedic knowledge of every edge-case problem your company deals with on a day-to-day basis is ridiculous.

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As OP said, you would not be able to google the specific B-Tree question because if you don't know about B-Trees you wouldn't know that you need to google it.

There's a difference between things you know you don't know (and therefore can google), and things you don't know you don't know (and therefore will not google).

"I can see you're a bright individual and you have a great track record for writing and shipping good software, which is clear from your github account and your previous employers' endorsements. I have no doubt you'll be able to come up to speed on <insert obscure discipline> which is something we use a lot around here. We're looking for people who can learn quickly. Welcome aboard!"

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