Small Business Owner, Software Engineer, and Consultant in Warsaw, Poland
Jacek is an IT freelancer specializing in Apache Spark, Delta Lake, Apache Kafka (with brief forays into a wider data engineering space, e.g. Trino and ksqlDB).
Jacek offers software development and consultancy services with very hands-on in-depth workshops and mentoring.
He is best known by "The Internals Of" online books available free of charge at https://books.japila.pl/.
You can click the button above to read my book. If you’d like to get in touch, feel free to say hello through any of the social links below.