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Data engineering and AI notes from engineers who do the work.

Pipelines, models, systems and interviews — written by mentors, free for everyone.

Data Engineering

What FAANG Data Engineering Interviews Actually Test

It's not just LeetCode with SQL instead of Python. Here's what the loop actually looks like, and where most strong engineers lose points.

1 Sept 2026 · 2 min read

Data Engineering

Airflow vs. Kafka: When to Use Which

They get lumped together as 'data engineering tools,' but they solve different problems. Here's how to tell which one you actually need.

14 Aug 2026 · 2 min read

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