Data Engineer interviews go deep on SQL, data modelling and system design. You will be asked how you would handle late-arriving data, schema changes and backfills — the failure modes, not the happy path.
Start with PythonWork one topic at a time. Read the quick answer, say it out loud, then read the full reasoning to see whether you could survive the follow-up. Mark what you are confident on so your next session starts where this one ended.
If an answer here exposes something you have not properly learnt, the courses cover it chapter by chapter, for free.
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