Sergey Beryozkin
Principal Software Engineer at The Apache Software Foundation
Dublin, Dublin 1, Ireland
Summary
🤩
Rockstar🎓
Top SchoolSergey Beryozkin is a Principal Software Engineer with over 15 years of experience building secure, cloud-native Java platforms and middleware. Currently at IBM after a long tenure at Red Hat, he focuses on Quarkus and OpenID Connect/OAuth integrations, bringing deep expertise in authentication, token propagation, and RBAC. A prolific open-source contributor and longtime Apache committer, Sergey has improved core frameworks such as Quarkus and Thorntail and added multitenancy and Keycloak tests to real-world quickstarts and examples. His background spans backend infrastructure, microservices and JAX-RS, informed by prior architecture roles at Talend and JBoss where he worked on JOSE, OAuth2 and OpenID Connect implementations. Based in Dublin, he blends systems-level rigor with practical developer experience—often enabling native-mode deployments and tighter security in downstream projects. Colleagues know him for quietly surfacing subtle runtime issues (reintroducing warnings to catch real loading problems) that prevent production surprises.
15 years of coding experience
25 years of employment as a software developer
Computing machines complexes and networks, Computing machines complexes and networks at Minsk Radiotechnical Institute
Stackoverflow
778reputation
45kreached
39answers
1question
Github Skills (25)
keycloak10
authorizations10
openid-connect10
oid10
authentication10
microservices-application10
user-authentication10
java10
security10
javas10
quarkus10
authorization10
jwt10
rest-api10
microservices10
Programming languages (12)
Github contributions (5)
quarkusio/quarkus
Jan 2019 - Jan 2023
Quarkus: Supersonic Subatomic Java.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3168 reviews, 1325 commits, 1872 PRs in 4 years
Contributions summary:Sergey contributed to the Quarkus framework, focusing on the core features and integrations. They worked on enhancing the OpenID Connect (OIDC) client and token propagation, enabling more flexible authorization workflows. Furthermore, they implemented new features for the OIDC client, including the support for JWT bearer authentication and code flow, to provide improved security. The user was also involved in supporting multiple OIDC-related functions within the Vert.x HTTP library.
kubernetesquarkusjavareactivecloud-native
thorntail/thorntail-examples
Feb 2018 - Apr 2019
Examples of how to write applications using Swarm.
Role in this project:Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:27 commits, 18 PRs, 10 pushes in 1 year 1 month
Contributions summary:Sergey primarily focused on enhancing security and access control within the Thorntail examples, specifically targeting the jaas and keycloak demos. They implemented role-based access control (RBAC) restrictions within the security/jaas examples. Additionally, the user added features and refactored the Keycloak demo, enabling multitenancy support and improving integration. The user's work demonstrates a focus on security, API integration, and application configuration using the framework's features.
swarm
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