Linux Engineer / System Administrator We are seeking a Linux Engineer / System Administrator to support secure and mission-critical operational systems for high-profile clients across National Security. This is an excellent opportunity to join a business with a strong engineering pedigree, working in small, highly capable teams delivering impactful outcomes in critical environments. You'll benefit from a flexible hybrid working model, clear progression routes, and the opportunity to shape your career as the organisation continues to grow. For the right candidate, there is also the potential to gain Developed Vetting (DV/eDV), opening doors to some of the most sensitive and rewarding projects in the UK. Salary: £25,000 - £45,000 per annum ( bonuses) Location: Gloucester preferred (other offices considered) Working Pattern: Flexible hybrid working, split between office, client sites, and home Key Responsibilities Provide expert administration and support for secure Linux-based operational systems Perform proactive system maintenance, including patching, updates, and firmware deployments Monitor server and infrastructure health, troubleshooting performance issues and outages Deliver second-line technical support and carry out root cause analysis for production incidents Participate in an out-of-hours on-call rota when required Essential Skills Strong experience in Linux system administration (Red Hat preferred) Familiarity with server lifecycle and patch management tools (e.g., Foreman, Dell OME) Desirable Skills Basic understanding of Cisco networking Exposure to Infrastructure as Code tools such as Puppet Security Clearance Requirement Due to the nature of the work, applicants must hold an active UK Security Check (SC) clearance or higher and must be eligible to obtain Enhanced Developed Vetting (eDV). This typically requires applicants to be sole British nationals. If you are a motivated Linux professional with a problem-solving mindset and an interest in secure environments, we'd love to hear from you. Reasonable Adjustments: Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients. If you need any help or adjustments during the recruitment process for any reason, please let us know when you apply or talk to the recruiters directly so we can support you.