Hybrid Linux & Windows Server SME — Automation & Security

Nordea; Województwo mazowieckie; Hybrid; PLN 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid working model

Growth opportunities

Job summary

Nordea is seeking a Linux/Windows Subject Matter Expert (SME) to reduce operational risk across global estates. You will translate security policies into automated baselines, manage platform lifecycles, and engineer remediation of vulnerabilities, working across Windows and Linux environments.

You’ll join the Core Infrastructure team, collaborating with security, audit, and vendor teams to implement improvements, automate via Ansible and PowerShell, and enforce compliant, scalable infrastructure

Qualifications

• 5+ years of experience in systems engineering, infrastructure administration, or platform operations within enterprise environments.
• Strong hands-on experience with Windows Server, Active Directory, Group Policy, and/or Linux administration (RHEL, Ubuntu).
• Experience in infrastructure security, vulnerability remediation, compliance, or operational risk management.
• Knowledge of security frameworks and hardening standards such as CIS Benchmarks, STIGs, or ISO 27001.
• Experience working with vulnerability management tools (e.g., Tenable, Qualys) and implementing remediation plans.
• Proficiency in automation and scripting using Ansible, PowerShell, or similar tools.
• Familiarity with Git, CI/CD pipelines, and Infrastructure or Policy as Code practices.
• Understanding of configuration management and compliance monitoring tools such as Terraform, Puppet, or Chef.
• Experience with logging, monitoring, and SIEM platforms such as Splunk or Microsoft Sentinel.
• Exposure to regulatory and audit frameworks such as ISO 27001, SOC 2, PCI-DSS, or similar standards.
• Experience supporting operating system lifecycle management, upgrades, disaster recovery, and high-availability environments.
• Strong documentation, communication, and stakeholder management skills, with the ability to collaborate effectively across infrastructure, security, audit, and vendor teams.
• Relevant certifications such as CISSP, CISA, CompTIA Security+, RHCE, or Microsoft Certified credentials are a plus but not required.

Responsibilities

• Assess and mitigate technical infrastructure risks, including legacy systems, technical debt, unsupported platforms, and operational vulnerabilities.
• Develop and maintain security baselines, manage vulnerability remediation activities, and coordinate critical security patching across Windows and Linux environments.
• Ensure infrastructure compliance with internal policies and regulatory frameworks, while supporting audits and maintaining required technical documentation.
• Automate infrastructure and security processes using tools such as Ansible and PowerShell to improve consistency, efficiency, and scalability.
• Manage infrastructure configurations through Git-based workflows and CI/CD pipelines, ensuring changes are controlled, reviewed, tested, and traceable.
• Monitor and maintain secure, stable, and compliant server environments, proactively identifying and resolving issues.
• Provide expert support for complex operating system, performance, authentication, and security-related incidents, acting as the highest level of technical escalation.
• Collaborate with infrastructure, security, and application teams to implement improvements that enhance reliability, resilience, and operational efficiency.

Skills

Linux/Windows administration

Windows Server administration

Linux administration

Automation scripting

Vulnerability remediation

CI/CD pipelines

Git workflows

Documentation

Ansible

PowerShell

Terraform

Puppet

Chef

Splunk

Microsoft Sentinel

Tenable

Qualys

Tools

Ansible

PowerShell

Git

Terraform

Puppet

Chef

Splunk

Microsoft Sentinel

Tenable

Qualys

Job description

Nordea is seeking a Linux/Windows Subject Matter Expert (SME) to reduce operational risk across global estates. You will translate security policies into automated baselines, manage platform lifecycles, and engineer remediation of vulnerabilities, working across Windows and Linux environments.

You’ll join the Core Infrastructure team, collaborating with security, audit, and vendor teams to implement improvements, automate via Ansible and PowerShell, and enforce compliant, scalable infrastructure