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Debug a Nightly Job That Silently Produces Nothing is a hard troubleshooting interview question covering troubleshooting, debugging, root cause analysis, monitoring and alerting, postmortem — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
A nightly aggregation job has produced an empty output for four consecutive nights. It runs on schedule, exits zero, the scheduler records success, and there are no errors anywhere. A downstream report noticed three days late. The output file exists and contains a header and no rows.
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