System Administrator​/Infrastructure Engineer

PQShield is a cybersecurity company with 95 employees seeking a System Administrator / Infrastructure Engineer to manage server infrastructure, cyber resilience, and network security. This is a hands‑on role reporting to the Infrastructure Technical Director, where you will develop long‑term infrastructure strategy while managing day‑to‑day system operations across physical servers and network infrastructure.

• Develop and support management of existing development servers running Linux distributions (CentOS, Rocky Linux, Ubuntu) and macOS, including physical hardware
• Work with Infrastructure Technical Director and team leads to develop and implement scalable server, network, and storage strategy as the company grows
• Install, configure, and manage industry‑specific tooling and systems to manage jobs across a small computing cluster
• Develop and manage monitoring, alerting, and logging frameworks to proactively identify and resolve system bottlenecks
• Support network infrastructure and IT security across the company; maintain comprehensive documentation; procure equipment; and help maintain Cyber Essentials and ISO 27001 certifications

• Strong Linux administration skills including Ubuntu, CentOS, and Debian‑based distributions
• Experience building Docker images and running associated CI jobs
• Hands‑on expertise with scripting, system configuration, and software installation
• Experience with network security including firewall configuration and security policy implementation
• Organised approach to documentation using Google Workspace and Atlassian tools; collaborative mindset with empathy for colleagues’ technical challenges

• Red Hat Certified (RHCE or equivalent)
• Experience with macOS and Windows Server administration
• Experience with EDA software and self-hosted Git Lab
• Comfort with CLI tools and local tooling; familiarity with Ansible
• Interest in cryptography

Competitive salary and share option scheme; private health insurance for yourself and family; 25 days annual leave plus bank holidays and two wellness weeks; 50% gym membership discount; flexible and hybrid working with working from home budget