Explain BLEU, ROUGE, and BERTScore. When would you use each, and what are their limits?
The classic automatic metrics for generated text. Interviewers want you to pair each with its task and identify the blind spot common to all three. Candidates who pass explain why none of them is the last word on quality.
Updated Sep 2026 · Grounded in real GenAI, LLM, and AI/ML engineering interview loops and written to a senior-engineer editorial bar.
The classic automatic metrics for generated text. Interviewers want you to pair each with its task and identify the blind spot common to all three. Candidates who pass explain why none of them is the last word on quality.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.
