Originally published on AI Tech Connect.
The round that replaced the whiteboard For a decade, the system design interview had a stable script. Design a URL shortener. Design a news feed. Estimate queries per second, choose a database, add a cache, draw the load balancer, discuss consistency. Candidates prepared from the same handful of books and courses, and interviewers graded against the same handful of trade-offs. That script is being retired, one loop at a time. Teams building on large language models — which in 2026 means a large share of the teams hiring engineers at all — have replaced or supplemented the classic round with an open design conversation about the systems they actually run: retrieval pipelines, agent architectures, evaluation harnesses and inference cost. The 2026 interview guides now circulating make the…
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