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LLM System

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Problem

Design an LLM (Large Language Model) system

Asked in the Round 3: Behavioral Interview & System Design stage. System design component of the third round.

Describe how you would clarify requirements, select or fine-tune a model, build retrieval and ranking components where appropriate, serve inference, and evaluate the system. Discuss online and batch processing, data and feedback pipelines, latency and cost, monitoring, feature or prompt drift, training-serving skew, and failure handling. State the assumptions and scale questions you would ask before committing to capacity estimates.