Jacek is a Freelance Data Engineer specializing in apache-spark (incl. spark-sql and spark-structured-streaming), delta-lake, databricks, and Apache Kafka (incl. Kafka Streams) with brief forays into a wider data engineering space (e.g., trino, dask and dbt, mostly during Warsaw Data Engineering meetups).

I offer consultancy, courses, workshops, mentoring and software development services.

Contact me at [email protected] or DM me on twitter @jaceklaskowski.

I'm best known by "The Internals Of" online books available free of charge at https://books.japila.pl/.

I run Warsaw Data Engineering meetup.