Systems Administrator

Duration: 12 Months

Location: Hybrid - Remote working with one day per week in Wales

Rate: £500 per day

Start: ASAP

IR35 Status: Inside

 

Overview

We require an experienced Systems Administrator to support a major cyber security and operational technology (OT) uplift programme within a regulated environment.

This role will focus on secure configuration, system management, and the integration of key technologies across a complex infrastructure. You will play a key role in strengthening security posture, improving system hardening practices, and supporting the roll out of critical security tools already in progress.

 

Essential Skills & Experience:

As the Systems Administrator you will possess the following:

A trong background in IT systems administration (HND level or equivalent experience)

• Hands-on experience with:

• Windows Server, Linux (RedHat preferred), SQL Server
• Networking (Cisco routers/switches, TCP/IP)

• Experience managing and configuring Active Directory

• Proven ability to manage multiple priorities and projects simultaneously

• Excellent analytical and problem-solving skills

• Strong communication and stakeholder engagement skills

• Experience working within structured frameworks (e.g. ITIL)

 

Desirable:

• Experience in a regulated environment (e.g. NIS-CAF)

• Knowledge of OT environments, including:

• SCADA systems
• PLCs and telemetry systems
• Kerberos

• Understanding of industrial process control systems

• Awareness of Health & Safety and CDM regulations

• Experience within utilities or infrastructure sectors

 

Key Responsibilities inlcude:

To support cyber programme activities, delivering infrastructure changes aligned to recognised security frameworks (e.g. E-CAF), across:

• Windows & Linux servers
• SQL databases
• Network infrastructure (including Cisco)
• WAN services and data centres

• Improve system patching and secure configuration in line with vulnerability management standards

• Drive system hardening best practices, including:

• Development and deployment of “gold build” standards
• Retrofitting security controls to existing systems

• Investigate and resolve incidents and problems, ensuring minimal disruption to business-critical systems

• Support the roll out and configuration of security technologies, including:

• Network intrusion detection systems
• Endpoint Detection & Response (EDR)
• Enterprise backup solutions

• Collaborate on documentation for secure management of IT and security tooling within an OT environment

• Ensure robust User Acceptance Testing (UAT) prior to system releases

• Strengthen Identity & Access Management processes, including Joiner/Mover/Leaver workflows

• Support implementation and ongoing management of Active Directory, including identity governance

• Manage system changes within an ITIL-based framework

• Work with internal teams and third-party suppliers to implement cyber and physical security controls

• Deliver work in line with governance standards, project timelines, cost, and quality expectations

• Able to work in a collaborative, multi-disciplinary environment

 

If this role is of interest, please email your CV to: joanne.stanley@certes.co.uk