Unclaimed profile. Built from public data on Upwork — is this you? Request removal. · Claim it → instant +10 ranking points on lancerank.com/browse. Free, takes 60 seconds.
I have over 9 years of experience in Data Engineering (especially using Spark and pySpark to gain value from massive amounts of data). I worked with analysts and data scientists by conducting workshops on working in Hadoop\u002FSpark and resolving their issues with big data ecosystem. I also have experience on Hadoop maintenance and building ETL, especially between Hadoop and Kafka. You can find my profile on stackoverflow (link in Portfolio section) - I help mostly in spark and pyspark tagged questions.
At a glance
Mariusz is a Backend Development freelancer based in Brzozowka, listed on LanceRank. Public record shows 45 verified projects, verified Upwork reputation, last updated 2026-07-02.
Looking for someone else?
Browse other verified backend development on LanceRank.
The proof
No verified reviews yet.
What they do
This profile isn't scored — LanceRank Scores are calculated only for verified members. The verified facts below come from public data.
Independent trust platform. How scores work · Report this profile