DataNerd is a complete, offline-first course for learning data engineering — from the fundamentals all the way to AWS, Azure, GCP, and Databricks, plus 300 real SQL interview questions you can actually run.

📚 A FULL DATA ENGINEERING CURRICULUM
18 modules and 150+ lessons covering everything a working data engineer needs: databases & SQL, data modeling, distributed processing, workflow orchestration, data quality, architecture patterns, security & governance — plus dedicated modules for AWS, Azure, GCP, and Databricks so you can go deep on the cloud platform you actually use.

💻 PRACTICE LIKE A REAL INTERVIEW
Six SQL topics and 300 hand-written, interview-style problems, backed by a real embedded SQL engine — write actual queries and watch them run against a live database, not just multiple choice. Covers joins, window functions, subqueries & CTEs, aggregation, and query performance/indexing.

🎯 LEARN BY DOING, NOT JUST READING
Every lesson mixes flashcards, quizzes, case studies, hands-on projects, and realistic production-incident challenges, plus an interactive data pipeline simulation.

📈 TRACK REAL PROGRESS
XP, streaks, achievements, a GitHub-style activity heatmap, and a career readiness score that reflects how much of the curriculum, projects, and challenges you've actually completed — not just time spent in the app.

🔁 A DAILY HABIT, BUILT IN
One tap pulls a flashcard, a quiz question, and a SQL problem from what you've already unlocked, so keeping your streak alive takes under a minute a day.

🏆 SHARE WHAT YOU'VE EARNED
Finish a module — or the whole curriculum — and generate a shareable certificate to post or send.

🔒 YOUR PROGRESS STAYS ON YOUR DEVICE
No account and no login are required, and there's no cloud sync — every lesson is bundled with the app and works fully offline. Your XP, streaks, and answers are stored locally on your device.

Whether you're prepping for a data engineer interview, switching into the field, or just sharpening your SQL, DataNerd gives you one place to learn it, practice it, and prove it.