Piotr Mrówczyński
Data Engineer
Poland
Summary
🤩
Rockstar🎓
Top SchoolPiotr Mrówczyński is a data engineer with over a decade in software engineering and more than eight years focused on building scalable, end-to-end data platforms that turn infrastructure and pipelines into actionable business value. He has driven migrations to modern CDP architectures, designed phased migration strategies, and modeled product and audience data to enable reliable external activation and higher data quality. His background includes big-data work at CERN—supporting Hadoop, Spark, HBase and Kafka—and long-term open-source contributions to projects like the kubeflow/spark-operator and ownCloud core, where he improved PySpark support, Hadoop config handling and security-related backend components. Comfortable across backend, DevOps and data architecture, Piotr combines practical production experience with a teaching mindset—believing mastery comes through explaining and sharing knowledge. Based in Poland, he brings a pragmatic, systems-level approach to turning complex data ecosystems into dependable products.
10 years of coding experience
8 years of employment as a software developer
Bachelor of Engineering (B.Eng.) Telecommunication and Computer Science, Bachelor of Engineering (B.Eng.) Telecommunication and Computer Science at Lodz University of TechnologyMaster of Science (MSc) Computer Science, Master of Science (MSc) Computer Science at KTH Royal Institute of TechnologyMaster of Science (MSc) Computer Science, Master of Science (MSc) Computer Science at Technische Universität BerlinTechnical University of Denmark
Polish, English, German, French
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (22)
kubernetes10
apache-spark10
kubernetes-operator10
php10
file-sharing10
go10
kubernetes-pods10
owncloud10
back-end-development9
dockers9
cicd9
cd9
docker9
apidoc8
api8
Programming languages (13)
Github contributions (5)
owncloud/core
Sep 2019 - Jan 2023
:cloud: ownCloud web server core (Files, DAV, etc.)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:136 reviews, 81 commits, 150 PRs in 3 years 4 months
Contributions summary:Piotr primarily contributed to the core back-end functionalities of the ownCloud web server. Their commits focused on bug fixes and minor enhancements to the PHP codebase, including adjusting background job intervals for expiring trash, improving documentation within the share manager, and addressing security-related issues in the security middleware. The user also made changes related to federated sharing and access control within the core. They demonstrated a strong understanding of the project's PHP and file-sharing components.
owncloudweb-serverjstreeself-hostingjavascript
kubeflow/spark-operator
May 2018 - Apr 2019
Kubernetes operator for managing the lifecycle of Apache Spark applications on Kubernetes.
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:11 commits, 15 PRs, 126 comments in 11 months
Contributions summary:Piotr primarily contributed to the back-end aspects of the Spark operator, addressing a bug related to the `SPARK_CLASSPATH` environment variable and modifying the configuration handling for Hadoop configurations. They also added support for PySpark, enhancing the operator's functionality. In addition, they implemented changes to support Kubernetes API version updates and made adjustments to the `sparkctl` tool. They also worked on improving the tooling by unifying listing with status/event commands.
lifecyclespark-applicationsapacheoperatorspark
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