Janusz Marcinkiewicz
Software Engineer at NVIDIA
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolJanusz Marcinkiewicz is a software engineer with 11 years of experience, currently building backend systems at NVIDIA from Warsaw. He specializes in scalable storage and cloud-native infrastructure, contributing to high-profile open-source projects like NVIDIA/aistore and KubeVirt where he improved performance, stability, and build/config reliability. Comfortable across Go, Kubernetes, and AWS integrations, he has a track record of pragmatic refactors, logging and API fixes, and enhancing cloud bucket synchronization and downloaders in production systems. His background includes full academic training in computer science (BSc and MSc from the University of Warsaw) and early hands-on web work in Django and SEO that sharpened his product-focused mindset. Known for quietly reducing complexity in performance-sensitive code paths, he balances day-to-day engineering with thoughtful long-term maintainability. Based in Warsaw, he brings deep backend expertise to teams building large-scale AI and virtualization platforms.
11 years of coding experience
1 year of employment as a software developer
Warsaw School of EconomicsBachelor's degree, Computer Science, Bachelor's degree, Computer Science at University of Warsaw
Polish, English
Github Skills (18)
kubernetes10
cloud-computing10
back-end-development10
object-storage10
go10
kubernetes-pods10
backend10
build-system9
distributed-systems9
aws9
optimisation9
optimization9
virtualization9
performance-optimization8
libvirt8
Programming languages (9)
Github contributions (5)
NVIDIA/aistore
Jul 2018 - Dec 2022
AIStore: scalable storage for AI applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 reviews, 1537 commits, 11 PRs in 4 years 6 months
Contributions summary:Janusz primarily focused on enhancing the functionality and stability of the AIStore backend system. Their contributions included bug fixes in the AWS object listing, refactoring code related to bucket checks and processing. Additionally, they added functionality related to cloud bucket synchronization and improvements to the downloader component. Their work also involved introducing performance improvements in several areas of the system.
aiobject-storageetl-offloadlinear-scalabilitybatch-jobs
kubevirt/kubevirt
Aug 2021 - Nov 2022
Kubernetes Virtualization API and runtime in order to define and manage virtual machines.
Role in this project:Back-end Developer / DevOps Engineer
Back-end Developer / DevOps EngineerContributions:69 reviews, 23 commits, 26 PRs in 1 year 3 months
Contributions summary:Janusz primarily contributed to improving the efficiency and maintainability of the Kubevirt project. Their work included reducing logging in performance-sensitive code paths, refactoring logging-related components, and simplifying existing methods. They also addressed deprecated API usages and fixed flag defaults in the build configuration, along with propagating flags. The user demonstrated skills in Go, Kubernetes, and build system optimization.
kubernetesvirtual-machinevirtualizationlibvirtvms
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