System Administrator

Billennium; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Udemy for Business

Private medical care

Multisport card

Veterinary care package

Language lessons

Shopping vouchers

Job summary

Billennium is seeking an experienced OpenShift / Kubernetes Administrator to join a long-term project based in Warsaw. The role focuses on building and maintaining modern cloud-native platforms and database solutions.

The candidate will administer OpenShift and Kubernetes environments, manage PostgreSQL databases on Kubernetes, implement GitOps with Argo CD, and own CI/CD pipelines within GitLab and OpenShift. Hybrid work based in Warsaw is preferred.

Qualifications

• Hands-on experience administering OpenShift or Kubernetes platforms.
• Strong understanding of containerized environments, networking, storage, and RBAC.
• Experience with CI/CD and GitOps practices.
• Experience managing PostgreSQL databases in Kubernetes environments.
• Knowledge of Git, GitLab, and infrastructure automation.
• Experience with monitoring and logging solutions (Prometheus, Grafana, Loki, or similar).
• Understanding of security best practices in Kubernetes/OpenShift environments.
• Good communication skills and ability to work effectively in a collaborative team environment.

Responsibilities

• Administration and maintenance of OpenShift and Kubernetes environments.
• Installation, configuration, and lifecycle management of OpenShift clusters.
• Management of PostgreSQL databases running on Kubernetes (CNPG / EDB Postgres).
• Configuration and maintenance of high-availability solutions, including failover, switchover, and replication.
• Backup and recovery management using Barman, S3, and WAL archiving.
• Implementation and maintenance of GitOps practices with Argo CD.
• Creation and support of CI/CD pipelines within GitLab and OpenShift.
• Monitoring, logging, troubleshooting, and performance optimization of platform services.
• Implementation of security best practices across containerized environments.

Skills

OpenShift

Kubernetes

CI/CD

GitOps

PostgreSQL

GitLab

Monitoring

Security

RBAC

Networking

Storage

Tools

Prometheus

Grafana

Loki

Job description

Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!

We are looking for an experienced OpenShift / Kubernetes Administrator who will join a long-term project focused on building and maintaining modern cloud-native platforms and database solutions. Hybrid work based in Warsaw is preferred.

Scope of responsibilities:

• Administration and maintenance of OpenShift and Kubernetes environments.


• Installation, configuration, and lifecycle management of OpenShift clusters.


• Management of PostgreSQL databases running on Kubernetes (CNPG / EDB Postgres).


• Configuration and maintenance of high-availability solutions, including failover, switchover, and replication.


• Backup and recovery management using Barman, S3, and WAL archiving.


• Implementation and maintenance of GitOps practices with Argo CD.


• Creation and support of CI/CD pipelines within GitLab and OpenShift.


• Monitoring, logging, troubleshooting, and performance optimization of platform services.


• Implementation of security best practices across containerized environments.

Required skills and qualifications:

• Hands-on experience administering OpenShift or Kubernetes platforms.


• Strong understanding of containerized environments, networking, storage, and RBAC.


• Experience with CI/CD and GitOps practices.


• Experience managing PostgreSQL databases in Kubernetes environments.


• Knowledge of Git, GitLab, and infrastructure automation.


• Experience with monitoring and logging solutions (Prometheus, Grafana, Loki, or similar).


• Understanding of security best practices in Kubernetes/OpenShift environments.


• Good communication skills and ability to work effectively in a collaborative team environment.

What we offer:

• Non-salary benefits package — Udemy for Business, private medical care, Multisport card, veterinary care package, language lessons, shopping vouchers.


• Flexibility — flexible working hours and remote/hybrid work options tailored to your lifestyle and location.


• Career development — access to training and certifications, collaboration with global technology partners and participation in challenging infrastructure projects.


• Engaging community — participation in team-building events, hackathons, knowledge-sharing initiatives, and CSR activities.


• Company traditions — annual team-building event in the Masuria region.