SENIOR INFRASTRUCTURE ENGINEER

Leidos is seeking an experienced Senior Infrastructure Engineer to lead a team in supporting and maintaining an IT service management tool (ServiceNow) for a large organisation. This role predominantly requires advanced expertise in Linux administration, automation, and system integration, some basic Windows experience, along with strong team leadership and mentorship skills. The ideal candidate will be responsible for ensuring system stability, security, and performance, while guiding and supporting their team in optimizing Linux environments and infrastructure. This role requires a daily in-office presence.
Everything we do is built on a commitment to do the right thing for our customers, our people and our community. Our mission and our values guide the way we do business. The foundation of our Leidos culture is our Values, Beliefs and Expectations by which we select, recognise and reward employees. They create the environment that drives us toward our mission.
Passionate about customer success by being determined to understand and respond to our customers’ needs as if they were our own. United as a team, we are bound together by our conviction that ethics and integrity is core to how we operate.
Leidos is a global science and technology solutions leader working to solve the world’s toughest challenges in the defence, intelligence, homeland security, civil, and health markets. The company’s 33,000 employees support vital missions for government and commercial customers. Candidate must be eligible to undergo security clearance (DV).

ADDITIONAL SKILLS:

• Familiarity with security frameworks such as CIS benchmarks and ISO 27001.
• Experience with log management and SIEM solutions (ArcSight, Splunk, ELK Stack).
• Hands-on experience with Linux-based high availability and disaster recovery solutions.
• Familiarity with virtualization technologies.
• Experience with automated patch management in Linux environments.
• ServiceNow environment experience is desirable.
• Experience transitioning of systems to service.

WHO WE ARE:

Leidos UK & EUROPE – we work to make the world safer, healthier, and more efficient through technology, engineering and science.
Leidos is a growing company delivering innovative technology and solutions focused on safeguarding critical capabilities and transformation in frontline services, our work in the United Kingdom includes addressing some of the most complex problems in defence, healthcare, government, safety and security, and transportation.

• System Administration & Configuration Management: Manage and maintain Red Hat Enterprise Linux (RHEL) environments running application and database servers, ensuring optimal performance and stability. Manage and maintain limited Windows Servers running ITSM agents.
• Troubleshooting & Root Cause Analysis: Identify, analyse, and resolve complex system issues.
• Incident & Problem Management: Implement robust incident response and problem-resolution strategies.
• Performance Monitoring & Optimization: Utilize to proactively enhance system performance.
• Security & Compliance: Ensure adherence to industry best practices, including patch management, vulnerability assessments, and security hardening (e.g., CIS benchmarks, STIG compliance).
• Automation & Scripting: Develop automation scripts using Bash, Python, or Ansible to streamline system operations and deployments.
• Documentation & Knowledge Sharing: Maintain technical documentation, including system build guides, upgrade procedures, and troubleshooting manuals.
• System Upgrades & Project Support: Lead system upgrades, migrations, and integration projects, ensuring seamless execution.
• Logging & Monitoring Integration: Configure and manage RHEL logs for ingestion into a SIEM (Security information and event management) ; integrate Linux systems with SCOM (with assistance from the existing SCOM Infrastructure Engineer) for health monitoring.
• Antivirus & Endpoint Security: Ensure AV integration and health monitoring within Linux and Windows Server environments.
• Infrastructure Integration: Collaborate closely with development, security, and operations teams to optimize Linux systems within the broader IT ecosystem.
• Testing & Validation Support: Oversee execution of test scripts for platform validation, supporting testers and troubleshooting potential issues.