About this role

Senior Linux Administrator (f/m/x) Sii Polska Daily tasks: - Administering, monitoring, and maintaining Linux environments, with a strong focus on stability, availability, and security - Identifying, troubleshooting, and resolving system and application issues in Linux-based environments - Supporting vulnerability management activities, including patching, hardening, and remediation of security findings - Creating and maintaining automation scripts to improve daily administration and operational processes - Supporting Jenkins-related automation used for deployment, maintenance, or operational workflows - Maintaining and troubleshooting application server components, especially Tomcat/JWS - Cooperating with application, DevOps, and infrastructure teams to ensure smooth delivery and operational continuity - Analyzing logs, incidents, and monitoring alerts to identify root causes and prevent recurring issues - Preparing and maintaining technical documentation, operational procedures, and security-related instructions Musts: Linux, Apache Tomcat, Jenkins, Vulnerability At least 5 years of strong hands-on experience in Linux administration Very good understanding of system security, vulnerability fixing, patching, and hardening practices Practical experience in scripting and automation, e.g., Bash, Python, or Ansible Experience with Jenkins administration or support of Jenkins-based automation processes Knowledge of Tomcat/JWS administration, troubleshooting, and operational support Ability to analyze logs, diagnose incidents, and resolve technical issues independently Good communication skills and readiness to cooperate with technical stakeholders in an international environment Reliability, ownership, and a proactive approach to improving operational processes Availability to work in a hybrid model (2 days per week from the client’s office in Cracow) Nice-to-have requirements Experience with IBM products such as WebSphere Liberty Profile (WLP), IBM MQ, or ACE Previous experience in banking or other highly regulated enterprise environments Knowledge of additional automation, configuration management, or monitoring tools Red Hat or other Linux-related certification We are looking for an experienced Linux Administrator to join a team responsible for maintaining secure, stable, and highly available Linux-based environments.

The role focuses on Linux administration, vulnerability fixing, automation, and operational support for application and middleware platforms.

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