About the author - Data Craze

Hi! My name is Krzysztof.

For over 15 years I've worked with databases, data warehouses, and data pipelines. I've seen companies spend millions on "Modern Data Stacks" while tripping over basic SQL and having no clue how their databases work under the hood.

The problem isn't technology. It's a lack of foundations.

That's why I built Data Craze - to teach engineering, not just tools. I dismantle data chaos to the bare metal and show how to build systems resilient to it.

If you prefer stable architecture over the next hype train - you're in the right place.

Now:

Husband and Father of two
Living in Cracow, Poland
Turning data chaos into boring, reliable systems at Data Craze
Founding Engineer (Data Platform) at Desia.ai
Creator of ZrozumSQL - SQL online course (in Polish)
Amateur Runner - Crown of Polish Marathons finisher

What I know best:

Database internals (PostgreSQL, storage engines, MVCC, vacuuming)
SQL - from fundamentals to performance tuning
Data Warehouses & ETL/ELT pipelines
Bridging the gap between business and engineering

ESTJ based on 16personalities.com

Focus, Achiever, Relator, Responsibility, Significance based on Gallup CliftonStrengths

Opinions shared on this page are exclusively my own.

Last updated at: 20-02-2026