Cursor MLE Interview Questions (2026)

Questions reported from Cursor machine learning engineer interviews. This bank tracks 8 questions asked at Cursor (2 with free model answers). Practice them live with DeepOffer's AI voice interviewer.

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#176 Enumerate and rank every lever for cutting LLM serving cost by 10x. ★
#239 Design the harness for an agent making multi-file changes from a natural-language task without wrecking the codebase.
#243 Explain how to detect and measure hallucinations in a production RAG system. ★
#289 Design a code assistant: repo indexing, context assembly, edit application, and evaluation.
#290 Design Cursor's tab (next-edit prediction) system with sub-100ms perceived latency for millions of daily users.
#330 Build the core of an editor text buffer with efficient arbitrary insert/delete and fast line lookup.
#331 Given a repository snapshot (path → content), build a Merkle tree and return which files changed between two snapshots without comparing every file's content.
#384 With two days in the codebase and no assigned task, explain what you would build and how you would spend the time.