About

I'm a backend engineer with six years of experience, most of it spent building analytical data systems over billion-row datasets.

From 2022 to 2026 I was a core backend engineer at Cookie3, a social and crypto-market data analytics startup. I introduced ClickHouse as the analytical database behind all of our products and designed its four production clusters, brought in Airflow for ingestion pipelines, and set up OpenTelemetry-based observability across every service. Most recently I was the primary engineer on Cookie AI, an agent built on Claude that answers natural-language questions by generating and running ClickHouse SQL.

Before that I built .NET services at AXA. I have a master's degree in computer science from the University of Warsaw.

I'm currently looking for my next role, ideally remote, around data infrastructure, observability, or LLMs over data.

Contact

Email me at hello@alekwisniewski.dev, or find me on GitHub and LinkedIn. My CV is here.