Hello, I'm
Rafał Kaliszczuk
Data Engineer @ Booksy who turns messy data into systems that actually make sense.
About Me
I'm a Data Engineer. I build the unglamorous plumbing - pipelines, warehouses, the stuff that lets other people do the interesting work - and I care about making it easy to use and hard to break.
At Booksy, that means dbt, Airflow, BigQuery and Terraform behind a global beauty marketplace. Most days are small decisions: how an event becomes a model, how a model becomes a dashboard, and how none of it wakes someone up at 2am.
When I'm not shipping dbt models or untangling Airflow DAGs, you'll likely find me on a Padel court or playing Spikeball.
Experience
Booksy
Apr 2024 - Present
Data Engineer
Apr 2025 - Present
Transitioned to core Data Engineering to focus on high-scale infrastructure. Designing and optimizing end-to-end pipelines, ensuring data reliability and performance across the entire ecosystem.
Analytics Engineer
Apr 2024 - Mar 2025
Focused on the dbt warehouse layer and data modeling. Bridging the gap between raw data and business intelligence by creating clean, documented, and tested datasets.
Capgemini
Dec 2021 - Mar 2024
Data Engineer
Jan 2023 - Mar 2024
Built and maintained robust data architectures for international clients. Leveraged SQL, Python, and cloud technologies to automate complex ETL processes and support data-driven decision making.
Junior Data Engineer
Dec 2021 - Jan 2023
Started my engineering journey delivering on client projects across multiple stacks. Built solid foundations in SQL, Python, and ETL design while learning how production data systems are run day to day.
Projects
Changelog monitoring for 26 data tools. Classifies releases as breaking / warning / info with AI and sends a plain-English digest.
Browser-based ER diagram viewer for DBML schemas. Upload a file, paste contents, or embed it at build time, no backend required.
Python linter for LookML. Catches naming issues, missing descriptions, and structural mistakes before they hit production.
