Everything you need
to land the offer.
Nothing you don't.
Full Access
everything included
Every feature on DataDriven is free, and it will stay free. No credit card required.
Built to get you through
the DE interview.
Every minute of prep maps to what DE interviewers actually ask
- Dimensional modeling, SCDs, incremental loading, Spark internals, streaming semantics, and pipeline architecture are the topics DE interviewers actually test.
- SQL depth beyond the starter set: window functions, gaps-and-islands, sessionization, rolling aggregates.
- Pipeline system design drills force you to reason about scale, cost, and reliability trade-offs on the whiteboard, the way a real DE onsite does.
Walk into every interview already knowing what they test
- Stop guessing what to study. See exactly which patterns your target company tests most heavily so every hour of prep counts.
- Know before you walk in: Databricks weights Spark shuffle tuning 4x the average, Meta leans heavily on SQL windows, Stripe loves idempotent backfills.
- The question set you practice is weighted to the target company's actual pattern distribution, not a generic Top-100 list.
Stop re-learning what you already know
- Every attempt updates a per-concept mastery model that tracks where you are strong, shaky, and blind.
- The next question you see is the one that closes your biggest weakness against your target company's pattern mix, not the next one on a static list.
- Stop grinding 200 problems to re-learn what you already know. Every session is short, precise, and measurably moves your readiness score.
Know exactly when you're ready to pass
- A single readiness score per target company reflects your mastery against their pattern weights, calibrated on real interview outcomes.
- Every solution explains interviewer intent, what breaks at scale, and the follow-up questions you will get, so you walk in ready for the real conversation.
- Mock interviews calibrated to a specific company's question mix, scored with the rubric an interviewer actually uses.
Frequently
asked
questions
Is DataDriven really free?
Yes. Every feature, every problem, every tool. No trials, no credit card required, no premium tier.
Will it become paid?
The platform will remain free. Every current feature stays available to every user at no cost.
How do you group questions by company?
Every question is tagged based on real interview reports, pattern analysis, and verified data-engineering interview loops. Tags update as industry trends shift.
What topics are covered?
SQL (window functions, CTEs, joins, aggregation, gaps-and-islands, sessionization), Python (data structures, string manipulation, OOP, data processing), data modeling (star schema, SCDs, normalization, CDC), and pipeline architecture (batch vs streaming, idempotency, system design).
How is DataDriven different from LeetCode?
LeetCode is built for software engineering interviews. DataDriven is built exclusively for data engineering interviews: the SQL, Python, data modeling, and pipeline architecture patterns that DE interviewers actually test.