Jacek Laskowski
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I am an IT freelancer specializing in apache-spark, delta-lake, apache-kafka, kafka-streams, ksqldb. I offer consultancy, courses, workshops, mentoring and software development services.
Contact me at jacek@japila.pl 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.