DataDriven
Practice real data engineering interviews, for free.
DataDriven launched on April 23, 2026.
What it does
DataDriven.io is the free web platform for data engineering interview prep. Your day job does not prepare you for what they actually ask in the interview, so we simulate all four rounds: live SQL against a real database, Python with live execution, data modeling, and pipeline architecture. AI mock interviews run clarifying questions, coding, follow-up discussion, and a hire/no-hire verdict. Real company-specific questions with adaptive difficulty adjust to your skill level.
The data engineering interview community. Practice SQL, Python, data modeling, and pipeline architecture with real code execution.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 WITH deduped AS ( SELECT user_id , plan_tier , event_ts , rn FROM user_events WHERE rn = 1 ) SELECT s . user_id , s . plan_tier , s . event_ts FROM deduped s LEFT JOIN users d ON s . user_id = d . user_id WHERE d . user_id IS NULL OR d . hash_diff != s . plan_tier WITH deduped AS ( SELECT user_id, plan_tier, event_ts, rn FROM user_events WHERE rn = 1 ) SELECT s.user_id, s.plan_tier, s.event_ts FROM deduped s LEFT JOIN users d ON s.user_id = d.user_id WHERE d.user_id IS NULL OR d.hash_diff != s.plan_tier fact_sessions × session_key PK user_key FK device_key FK event_count dim_user_scd2 × user_key PK…from datadriven.io
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