Vector Databases & Embeddings
How embeddings represent meaning, how vector databases index and search them at scale, and the tradeoffs behind both.
5 of 23 published
Beginner
Opener question. They're checking whether you can explain a core concept without hiding behind jargon.
Separates people who've used an embeddings API from people who know what it's doing.
A setup question. Your answer here decides whether they ask you about hybrid search next.
Almost everyone can define them. Far fewer can say when the choice changes your results.
Tests whether you reach for new infrastructure by default or because something specific required it.
A schema-design question in disguise. Gets asked because most people under-plan this and pay for it later.
Intermediate
They want to hear you say "approximate" and mean it. Knowing there's a recall cost at all is the bar.
Tests whether you evaluate for your domain or copy whatever's top of MTEB.
A cost-awareness question. Common follow-up when you mention a model choice.
Comes up if the role touches search, recommendations, or anything with images.
Asked at companies actually paying an infrastructure bill.
One of the strongest signals that you've shipped RAG rather than read about it.
The question most candidates fumble. If you can name real metrics, you stand out immediately.
A debugging question. They're watching how you narrow down a cause, not whether you know the answer.
Advanced
A migration question. Tests whether you think about the system while it's serving traffic.
Asked at any B2B company. There's no single right answer, which is the point.
Scale question. They want to know if your mental model has real limits in it.
Half the signal here is knowing when NOT to.
Tests whether you know what's actually stored in an index versus what you assumed.
A diagnosis question. Guessing loses; having an order to check wins.
A specific, nasty situation. Usually asked by someone who has lived it.
The best question on this list. Understanding why a high score can be meaningless is what separates senior from mid.
An incident-response question. They're assessing how you behave when something is on fire, not what you know.