Senior Server Administrator - Vulnerability Remediation & Patching in Katowice

Seargin is an international technology transformation and delivery partner helping global enterprises turn complex technology challenges into measurable business outcomes. With 1,000+ technology professionals and a presence across Europe, the United States and Asia, we work with leading international organisations, including Fortune 500 companies, on business-critical transformation and technology initiatives. Our expertise spans SAP and Enterprise Transformation, Data & AI, M&A and Post-Merger Integration, Application & Managed Services, and complex technology delivery. What makes Seargin different is our ability to combine strategic expertise with hands‑on execution. We don’t just advise on transformation - we help design, build, implement and operate the solutions that make it successful. At Seargin, you’ll have the opportunity to:

Contribute to meaningful projects for globally recognised organisations. Work with experienced technology professionals in international environments. Develop your expertise across complex enterprise technologies and business challenges. Take ownership, share ideas and make a tangible impact. Grow your career in a collaborative, ambitious and internationally connected organisation. Join Seargin and help shape the technology behind global business transformation. About the role

We are looking for a

Senior Server Administrator

specializing in

Vulnerability Remediation & Patching

to help secure and maintain our enterprise hybrid cloud infrastructure. In this role, you will take full ownership of keeping our systems resilient against emerging security threats across AWS and Azure environments. Working with Windows Server and Linux (RHEL 9) systems, you will lead hands‑on patch management, upgrade critical middleware and runtimes, and implement security hardening practices. If you thrive in autonomous, high‑impact environments and enjoy collaborating with application teams to solve complex technical challenges, we’d love to have you on board! Requirements 'must have':

Minimum 5 years of experience as a system administrator in enterprise environments (no junior profiles) Proven hands‑on experience in patch management and vulnerability remediation based on scan results Strong Windows Server administration (2016/2019/2022) and solid Linux (RHEL) skills Experience administering servers in AWS; working knowledge of Azure Experience updating middleware and runtimes (SQL Server, .NET, Java, Tomcat, OpenSSL or similar) Independent troubleshooting skills and ability to work without close supervision Experience working with change management processes and coordinating with application teams Requirements 'nice to have':

Experience with vulnerability scanning tools (e.g. Tenable/Nessus, Qualys, Wiz) Patching automation (AWS Systems Manager, SCCM/MECM, Ansible, PowerShell, Bash) Experience with SIEM log integration and Microsoft Entra ID Background in large international companies (FMCG, pharma or similar) Responsibilities:

Remediate vulnerabilities identified by continuous security scans across a cloud environment (mainly AWS, partly Azure), following client documentation and runbooks Apply security updates to Windows Server 2016/2019/2022 and Red Hat Enterprise Linux 9 (including kernel updates) Implement security hardening and configuration fixes, e.g. HTTPS enforcement, security logging, SIEM log delivery, AWS SSM agent deployment, access key rotation, Azure VM extensions and network restrictions Troubleshoot issues arising during and after patching, independently and in real time Coordinate with application support teams to plan updates, confirm application behaviour and fix vulnerable libraries in applications Track remediation progress in the client’s vulnerability management tool and report status To learn more about Seargin, please visit our web page: www.seargin.com