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Design a knowledge-graph-backed question answering system.

Some questions need precise multi-hop facts that vector retrieval can't chain. The signal is entity linking plus query translation over a graph (or GraphRAG), and knowing when the graph is worth its maintenance cost. Here is the design.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Some questions need precise multi-hop facts that vector retrieval can't chain. The signal is entity linking plus query translation over a graph (or GraphRAG), and knowing when the graph is worth its maintenance cost. Here is the design.

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Next in this trackDesign the perception system for an autonomous vehicle (or robot).Next in this trackDesign a machine translation service at scale.Next in this trackDesign a human activity recognition system (from sensors or video).
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