Rafał Harabień
Senior Software Engineer at Allegro.pl
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolRafał Harabień is a Senior Software Engineer based in Warsaw with 14 years of experience building JVM-based systems, high-throughput e-commerce platforms, and embedded tooling. He blends low-level C/C++ experience—writing processor simulators and SDKs—with professional expertise in Java, Spring Boot, and SAP Commerce to solve performance and integration challenges involving millions of catalog items and complex external systems. At Allegro and earlier at e-point he focused on scalability, CI automation, and optimizing data-heavy workflows, including reverse-engineering legacy pricing logic into modern microservices. An active open-source contributor, he has improved usability and GCP operators in the widely used Apache Airflow project, demonstrating attention to developer UX and maintainability. Analytical by training (Politechnika Warszawska) and curious by practice, Rafał enjoys game development and low-level coding alongside large-scale backend engineering.
13 years of coding experience
6 years of employment as a software developer
Klasa Matex (matematyka eksperymentalna), Klasa Matex (matematyka eksperymentalna) at XIV LO im. Stanisława Staszica, WarszawaWarsaw University of Technology
English, Polish, German
Github Skills (26)
apache-airflow10
google-cloud-platform10
data-pipelines10
python10
wp-api10
data-engineering10
workflow-engine10
c1110
winapi10
gcp10
c1710
kernel10
etl10
direct3d10
orchestration10
Programming languages (15)
Github contributions (5)
apache/airflow
Feb 2022 - Oct 2024
Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
Role in this project:
Data Engineer
Data EngineerContributions:4 reviews, 6 PRs, 12 comments in 2 years 8 months
Contributions summary:Rafał contributed to the Apache Airflow project by modifying several components related to data transfer and workflow management. The contributions include fixes and enhancements to GCP related operators, specifically focusing on the GCSToS3Operator. They are improving the usability of BigQuery sensors and enhancing documentation, showing a focus on improving the user experience and maintainability of data pipelines. Furthermore, the user made significant changes to Dataproc Operators, adding improvements and removing the optional project id argument where possible.
monitorpythonschedulerapacheprogrammatically
rafalh/rf-tools
Jan 2020 - May 2022
Red Faction unofficial tools
Contributions:1 review, 123 commits, 3 PRs in 2 years 4 months
manualfactiontoolkit
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