Andrej Krejčír
Software Engineer at Red Hat
Slovakia
Summary
🤩
Rockstar🎓
Top SchoolAndrej Krejčír is a software engineer with a decade of experience building back-end and systems software, currently at Red Hat in Slovakia. He specializes in virtualization and cloud-native tooling, contributing to major open-source projects like oVirt and KubeVirt where he implemented storage QoS, VM NUMA pinning, REST API improvements, and resilience fixes. His work spans low-level libvirt interactions, scheduler and quota fixes in engine services, and Kubernetes virtualization API enhancements, reflecting a strong systems and infrastructure focus. Colleagues rely on him to translate complex VM lifecycle and performance requirements into maintainable server-side code and schema changes. He combines production-grade engineering with thoughtful test and memory-leak fixes, a detail that often prevents issues before they reach users. Trained at Masaryk University Brno, he pairs academic grounding with a pragmatic, open-source-first approach to distributed systems.
10 years of coding experience
Masaryk University Brno
Github Skills (25)
json-rpc10
unit-testing10
libvirt10
kubernetes10
python10
back-end-development10
apidoc10
java10
ovirt10
scheduling10
javas10
go10
manage10
api10
vms10
Programming languages (10)
Github contributions (5)
oVirt/ovirt-engine
Jul 2015 - Apr 2020
The oVirt Engine virtualization manager
Role in this project:
Back-end Developer
Back-end DeveloperContributions:417 commits, 1 comment in 4 years 9 months
Contributions summary:Andrej Krejcir primarily contributed to the back-end of the oVirt Engine, focusing on implementing fixes and improvements to the codebase. His work included addressing issues related to scheduling, such as correcting logging levels and incorporating fixes for memory and CPU utilization. Moreover, he worked on enhancements to the REST API, ensuring changes in parameters would reflect in the template. Additionally, his contributions touched upon core components related to quota management and the underlying database schema.
defoldlibvirtovirtvirtualizationovirt-engine
kubevirt/kubevirt
Mar 2020 - Nov 2022
Kubernetes Virtualization API and runtime in order to define and manage virtual machines.
Role in this project:Back-end & Systems Engineer
Back-end & Systems EngineerContributions:320 reviews, 57 commits, 61 PRs in 2 years 8 months
Contributions summary:Andrej primarily contributed to the codebase through a series of commits focused on enhancing the reliability, maintainability, and functionality of the Kubernetes virtualization API and runtime. They addressed issues related to Virtual Machine (VM) management, particularly with features like renaming, and added functionality to synchronize the "Ready" condition from Virtual Machine Instance (VMI) to VM resources. In addition, the user fixed potential memory leaks, improved tests, and added new API definitions to support flavor functionality. Their contributions touched upon critical areas of the KubeVirt project, indicating a deep understanding of its core components.
apivmsmachineslibvirtruntime
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