Ján Lieskovský
Kubernetes DevOps Engineer at Red Hat
Czechia
Summary
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Rockstar🎓
Top SchoolJán Lieskovský is a Kubernetes DevOps Engineer with 13 years of experience, currently advancing cloud-native operations at Alza.cz after a long tenure at Red Hat where he moved from QA and system administration into software and product work. He combines deep Linux and scripting expertise with hands-on Kubernetes, containers, and virtualization know-how, and is particularly focused on security and automation. His open-source contributions include security hardening for ComplianceAsCode and substantive backend improvements to Keycloak—work that spans audit logging, LDAP sync optimization, and compatibility fixes for WildFly. A Masaryk University computer science master's graduate, he continuously explores new Linux and open-source technologies in his spare time, often surfacing practical remediations and performance-minded fixes that are easy to overlook.
13 years of coding experience
Master's degree, Computer Science, Master's degree, Computer Science at Masarykova univerzita
English, German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (16)
keycloak10
javas10
ldap10
user-authentication10
fedora10
authentication10
security-hardening10
java10
security10
test-automation9
openscap9
wildfly9
automation9
automations9
saml7
Programming languages (10)
Github contributions (5)
ComplianceAsCode/content
Sep 2013 - Sep 2016
Security automation content in SCAP, Bash, Ansible, and other formats
Role in this project:
Security Engineer
Security EngineerContributions:28 releases, 952 commits, 360 PRs in 3 years
Contributions summary:Ján primarily focused on enhancing the security hardening content within the repository. Their contributions involved modifying and generating XCCDF content for various Linux systems, including RHEL6, RHEL7, and Fedora. They made significant changes by incorporating security best practices, fixing existing issues in security configurations, and converting rules across operating systems. The user also added or updated remediation scripts, further improving the security posture of the systems.
compliancecpescapsecurity-hardeningnessus
keycloak/keycloak
Oct 2018 - May 2021
Open Source Identity and Access Management For Modern Applications and Services
Role in this project:Back-end Developer
Back-end DeveloperContributions:33 reviews, 24 commits, 29 PRs in 2 years 7 months
Contributions summary:Ján's primary contributions involve modifying and enhancing the Keycloak server's functionality. Their work includes adding X.509 certificate data to audit logs, improving the time complexity of LDAP group synchronization, and addressing issues related to account console features. The commits also involve improvements to the authentication flows and test suite, reflecting a focus on security and usability. Additionally, the user has addressed issues to make Keycloak run properly with the Wildfly 22 and 23 versions.
oidcauthorizationidentity-and-access-managementaccess-managementsecurity
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