About

I'm a backend engineer with six years of experience, most of it spent building analytics products over billion-row datasets - and the data platforms underneath them.

From 2022 to 2026 I was a core backend engineer at Cookie3, a social and crypto-market data analytics startup. I built the backend of cookie.fun, a consumer analytics product with 1.6M unique visitors; the B2B APIs and MCP servers that let clients and their agents query our data; and most recently Cookie AI, an agent built on Claude that answers natural-language questions by generating and running ClickHouse SQL.

To make that possible, I introduced ClickHouse as the analytical database behind all our products and designed its data models and four production clusters, brought in Airflow for the ingestion pipelines, and set up OpenTelemetry-based observability across every service.

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

I'm looking for my next role: senior backend or data-platform work where the hard problems are large-scale analytical data, observability, or LLMs over real data. Warsaw or remote.

Contact

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