Data/ML/AIBackendTable-stakesAround since 2022
LangChain
A popular open-source framework for building LLM-powered applications — it provides pre-built pieces for chaining prompts, calling tools, connecting to vector databases, and managing conversation memory, so teams don't wire all of that up from scratch.
Think of it like
Like a plumbing kit of standard-sized pipes and fittings for connecting an LLM to your data and tools, instead of custom-welding every connection yourself.
Junior or senior?
Junior sounds like
Reaches for LangChain's abstractions for everything.
Senior sounds like
Can describe a case where those abstractions got in the way and they dropped down to a raw API call instead.
Ask them
“Tell me about a case where LangChain's abstractions got in the way, and you dropped down to calling the model API directly.”