Jiri Mencak
Performance Engineer at Red Hat
Brno, South Moravia, Czechia
Summary
🤩
Rockstar🎓
Top SchoolJiri Mencak is a Performance Engineer with over 10 years of experience tuning complex Linux, virtualization and cloud systems at Red Hat, backed by a PhD in Computer Science. He blends hands-on engineering with cross-team collaboration—identifying and resolving critical product performance issues across OS, storage, cloud and big-data workloads. His open-source contributions include core work on tuned (daemon and bootloader plugins) and improvements to OpenShift Ansible’s OpenStack integration, reflecting deep practical knowledge of production systems and deployment tooling. Previously he led a 15+ engineer team at AT&T, delivering process improvements, UNIX training that saved the company significant costs, and resilient network automation. Known for clear bilingual communication (Czech/English), strong integrity and a focus on knowledge sharing, he is deeply committed to reliability and measurable performance gains.
10 years of coding experience
6 years of employment as a software developer
Mechanical Engineering, Mechanical Engineering at Technical College of Hradec KrálovéPhD, Computer Science, PhD, Computer Science at The University of HuddersfieldMSc, Computer Science, MSc, Computer Science at Brno University of Technology Faculty of Information Technology
Czech, English, German
Github Skills (26)
bootloader10
kubernetes10
python10
configuration-management10
linux10
cloud-infrastructure10
heat10
automation10
temp10
infrastructure10
openshift10
openstack10
kubernetes-pods10
yaml10
ansible10
Programming languages (14)
Github contributions (5)
redhat-performance/tuned
Aug 2018 - Sep 2022
Tuning Profile Delivery Mechanism for Linux
Role in this project:
Back-end Developer
Back-end DeveloperContributions:61 reviews, 16 commits, 21 PRs in 4 years 1 month
Contributions summary:Jiri primarily contributed to the core functionality of the `tuned` project, focusing on the daemon and bootloader plugins. They addressed issues related to daemon behavior, particularly concerning rollback mechanisms and shutdown procedures. Additionally, the user implemented enhancements to the bootloader plugin, including consistent handling of grub configurations and conditional profile loading. Furthermore, the user provided and implemented plugin documentation.
mechanismwatchdogdaemonlinuxpower-management
openshift/openshift-ansible
Aug 2017 - Sep 2018
Install and config an OpenShift 3.x cluster
Role in this project:DevOps Engineer
DevOps EngineerContributions:25 commits, 28 PRs, 140 comments in 1 year 1 month
Contributions summary:Jiri primarily focused on improving the OpenStack integration within the OpenShift Ansible repository. Their contributions involved modifying Heat templates and Ansible inventory scripts to support OpenStack's CNS (Container Network Service) and improve stack scalability. Additionally, the user addressed a testing issue and fixed related security group configurations within the OpenStack environment, ensuring proper functionality and access for e2e tests and router metrics.
ansibleopenshiftk8skubernetesconfig
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