Design Real-Time Electricity Monitoring and Policy Control
Company: OpenAI
Role: Software Engineer
Category: System Design
Difficulty: hard
Interview Round: Technical Screen
Overview: Design a real-time electricity monitoring platform that converts device telemetry into safe, auditable usage-policy commands. The answer covers event-time processing, late and duplicate readings, hysteresis, command idempotency, acknowledgement reconciliation, offline devices, replay, and operational metrics.
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