Jozef Vilcek
Staff Software Engineer at The Apache Software Foundation
Czechia
Summary
🤩
Rockstar🎓
Top SchoolJozef Vilcek is a Staff Software Engineer based in Czechia with 11 years of experience building large-scale data ingestion and analytics pipelines for real-time advertising systems. He has led teams and delivered production data platforms using Scala, Java, Apache Beam/Scio, Spark, Flink, Kafka, Hive, Iceberg and containerized deployments on K8s/YARN. As an Apache Beam committer he contributed notable improvements to the Flink runner—adding max_parallelism handling for unbounded sources, unit tests for source translation, and an auto-balancing sharder—work that tangibly improved streaming stability and write performance. His background includes leading Seznam.cz’s web-crawler engineering team and architecting ad-tech data stacks at Zeta Global and Sizmek, giving him both operational and systems-design depth. Trained in AI (MSc), he combines a data-first engineering mindset with a track record of optimizing distributed processing at scale.
11 years of coding experience
13 years of employment as a software developer
MSc., Artificial Intelligence, MSc., Artificial Intelligence at Technical University of Košice
Github Skills (10)
javas10
big-data10
flink-sql10
parallel10
apache-flink10
apache-beam10
java10
streaming10
testing9
go4
Programming languages (7)
Github contributions (5)
apache/beam
Nov 2018 - Jan 2021
Apache Beam is a unified programming model for Batch and Streaming data processing.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:42 reviews, 11 commits, 30 PRs in 2 years 1 month
Contributions summary:Jozef primarily contributed to the Apache Beam project's Flink runner, enhancing its functionality. They focused on optimizing resource allocation by incorporating the `max_parallelism` configuration option for splitting unbounded sources in streaming pipelines. Further contributions include adding unit tests for the read source translator and implementing an auto-balancing sharding function for writes, improving write performance and stability. These modifications involved changes to Java code related to Flink's streaming and execution environment configurations.
golangpythonstreaming-databeambatch
JozoVilcek/gitbook-example
Jan 2015 - Oct 2015
Contributions:11 commits, 2 PRs, 9 pushes in 9 months
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