OT System Administrator

Operational Technology Systems Administrator/Analyst - 12 Months Contract- Day Rate £450 - £485 (Inside IR35) - Hybrid (1 Day a week South Wales)

The Opportunity

Yolk Recruitment Public Sector & Not-for-Profit team has partnered with a very unique nonprofit organisation who are undergoing a significant cyber and infrastructure uplift across their operational technology environment.

We're looking for a hands-on System Administrator with a strong focus on security, working across critical national infrastructure.

What you'll be doing

• Supporting a large-scale cyber programme aligned to regulatory standards (E-CAF)
• Managing and securing core infrastructure across:
• Windows & Linux servers
• SQL databases
• Cisco networks
• WAN and data centre environments
• Driving patching, vulnerability management and system hardening best practice
• Supporting rollout and optimisation of security tooling including EDR and intrusion detection
• Integrating and maintaining Active Directory and identity governance processes
• Supporting incident resolution and maintaining service continuity across critical systems
• Contributing to secure system design, documentation and UAT processes
• Working closely with internal security teams and external partners

What we're looking for

• Strong system administration experience across Windows, Linux and network environments
• Solid understanding of infrastructure security, patching and hardening
• Experience with Active Directory and identity/access management
• Knowledge of SQL Server and enterprise environments
• Ability to manage multiple priorities in a structured (ITIL-driven) environment
• Strong problem-solving skills and a proactive mindset

Nice to have

• Experience in regulated environments (e.g. NIS-CAF)
• Exposure to OT environments, SCADA, PLCs or telemetry systems
• Utilities or infrastructure sector experience
• Understanding of cyber security tooling (EDR, IDS, backup solutions)

Why this role?

• Work on critical infrastructure with real-world impact
• Be part of a major cyber transformation programme
• Blend of project work and operational ownership
• Strong long-term investment in technology and security

Yolk Public Sector & Not-for-Profit team works with organisations across the UK to fulfil their recruitment needs and to achieve their D&I objectives. We recruit temporary, contract and permanent hires for 1 off specialist needs or for volume campaigns. We support our applicants to navigate the public sector recruitment processes and secure their dream jobs.

Yolk Recruitment is an equal opportunities employer and embraces diversity in our workforce. We employ the best people for the job at hand and actively encourage applications from all qualified candidates, regardless of gender, age, race, religion, sexual orientation, disability, educational background, parental status, gender identity or any other protected characteristic. We champion and celebrate diversity at Yolk allowing our team to bring their whole selves to work.