IT Systems Administrator

John O'Conner (GM) Ltd; Plymouth; Hybrid; GBP 30,000 - 35,000; Full time

Job summary

Join a dynamic and expanding IT team where personal development and targeted training are prioritized. This role offers the opportunity to work at the Head Office with flexibility for home working. As a Systems Administrator, you will be responsible for maintaining and improving IT infrastructure, leading the IT Helpdesk, and ensuring effective security monitoring and compliance. The company is committed to investing in your growth, including potential apprenticeship opportunities. This is a fantastic chance to be part of a progressive IT department that values innovation and employee development.

Qualifications

• 3+ years in IT Systems Administration with experience in managing IT infrastructure.
• Experience leading an IT Helpdesk team and handling escalations effectively.

Responsibilities

• Maintain and improve IT infrastructure and lead the IT Helpdesk.
• Promote Cyber Security and ensure compliance with ISO 27001.

Skills

IT Systems Administration

Helpdesk Leadership

Patch Management

Cybersecurity & Compliance

Network Administration

Microsoft 365 & Active Directory

Virtualization & Cloud

Automation & Scripting

Incident Response & Disaster Recovery

Education

CompTIA Security+ or CySA+

Tools

Windows Server

Linux

VMware

Hyper-V

Azure

AWS

PowerShell

Python

Bash

Job description

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Direct message the job poster from John O'Conner (GM) Ltd

We offer an exciting opportunity to join a dynamic, expanding IT team with the opportunity for personal development, targeted training and progression. This role is based at our Head Office in Welwyn (with flexibility for home working 1-2 days per week), and we offer a superb working environment.

We are a progressive IT department who offer staff full encouragement to expand their knowledge and skills to the full extent of their potential. We strongly believe in training and developing our staff, and would be willing to invest in a Level 4 Apprenticeship or equivalent for the successful candidate.

Job Purpose

The Systems Administrator is responsible for maintaining and improving IT infrastructure, leading the IT Helpdesk, and ensuring effective security monitoring and patch management. The role focuses on security, user support and system reliability while contributing to and promoting best practices in cybersecurity and compliance.

Key Responsibilities include:

IT Infrastructure & System Management

Manage maintenance and health of servers, networks, cloud environments and software to ensure high availability.

Implement automation and monitoring to enhance system performance.

Work closely with MSP to maximise Microsoft 365/Entra security posture.

Oversee purchasing and asset management processes (with Head of IT) and lead on endpoint configuration.

Lead and oversee the IT Helpdesk, ensuring user issues are resolved efficiently.

Ensure KPIs are met in line with departments goals.

Provide 2nd/3rd line IT Support.

Cyber Security Promotion and User training

Actively promote Cyber Security in line with department policies, strategy and risk assessments.

Monitor threat intelligence feeds (EDR software/Defender/3rd party sources) and take appropriate actions.

Oversee and administer attack simulation software.

Assist Head of IT with delivery of user training.

Patch Management & Security Compliance

Manage patch deployment, updates, and vulnerability remediation.

Ensure compliance with ISO 27001 and take on responsibility for Cyber Essentials controls.

Work closely with Head of IT to achieve Cyber Essentials Plus accreditation.

Projects

Work closely with Head of IT and collaborate with IT Projects Coordinator on projects as required in line with business needs and department strategy.

Person Specification

Experience Required:

1. IT Systems Administration (3+ years preferred) – Proven experience managing IT infrastructure, servers, and end-user support in an SME or enterprise environment.

2. Helpdesk Leadership (3+ years preferred) – Experience managing an IT Helpdesk team, handling escalations, and setting IT support workflows.

3. Patch Management – Hands-on experience with OS and software patching (Windows Server, Linux) and using patch deployment tools.

4. Cybersecurity & Compliance – Experience working within ISO 27001, Cyber Essentials, NIST frameworks, including vulnerability management, access control, and security auditing.

5. Network Administration – Understanding of networking principles (firewalls, VPNs, VLANs, DNS, DHCP, TCP/IP).

6. Microsoft 365 & Active Directory – Strong expertise in managing Active Directory (Group Policies, permissions, user management), Microsoft 365 administration (Exchange, OneDrive, SharePoint, Intune), and Azure/Entra.

7. Virtualization & Cloud – Experience with VMware, Hyper-V, and Azure/AWS administration.

8. Automation & Scripting – Knowledge of PowerShell, Python, or Bash for automating tasks.

9. Incident Response & Disaster Recovery – Knowledge of backup solutions, disaster recovery planning, and IT continuity.

Qualifications & Certifications (Preferred):

CompTIA Security+ or CySA+ (Cybersecurity emphasis)

£30,000 - £35,000 depending on experience and qualifications.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

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