Marek Posolda
Principal Software Engineer at IBM
Brno, Southeast, Czechia
Summary
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RockstarMarek Posolda is a Principal Software Engineer with 14 years of experience specializing in backend security and identity management, now working on Keycloak at IBM after a long tenure at Red Hat. He has deep expertise in SSO, token-based auth and SAML/OIDC flows, demonstrated by contributions that tightened security, fixed critical vulnerabilities, and integrated Keycloak into JVM tooling like Hawtio. Marek blends hands-on backend engineering with practical full-stack tweaks—updating Keycloak quickstarts for Quarkus and Jakarta to ensure real-world compatibility. Based in Brno, he brings enterprise-grade delivery experience and a track record of making complex authentication flows both more secure and more user-friendly. An attention to integration nuances (logout behavior, token reuse, admin UX links) sets his work apart from typical backend contributors.
14 years of coding experience
16 years of employment as a software developer
Stackoverflow
31reputation
22kreached
1answer
1question
Github Skills (30)
keycloak10
back-end-development10
apidoc10
session-management10
user-authentication10
authentication10
java10
security10
javas10
api10
quarkus10
testing9
web-application9
javascript9
spring-boot9
Programming languages (9)
Github contributions (5)
keycloak/keycloak
Aug 2013 - Jan 2023
Open Source Identity and Access Management For Modern Applications and Services
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 3195 reviews, 2080 commits in 9 years 7 months
Contributions summary:Marek's commits primarily focus on addressing issues related to client client-side sessions, offline token re-use, and improvements in the API, which suggests back-end development. Contributions also include correcting an issue with SAML, which points towards experience with security protocols. The user demonstrates strong knowledge of API interactions and server-side functionality in relation to Keycloak.
access-managementkeycloakoidcsaml
keycloak/keycloak-quickstarts
Jun 2016 - Apr 2022
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:80 reviews, 81 commits, 86 PRs in 5 years 11 months
Contributions summary:Marek primarily focused on fixing and updating quickstart examples to work with the Keycloak Quarkus distribution. This involved modifying code across various files, including scripts, Java classes, and configuration files, to ensure compatibility. The contributions addressed issues related to OIDC RP-Initiated Logout, event listeners, event stores, and the extend-account-console. The changes included adaptations for the Jakarta profile and the Quarkus distribution, indicating a focus on maintaining and updating quickstart examples for different Keycloak deployments.
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