Senior IT Systems and Security Administrator

About the role

We’re on the hunt for a tech-savvy, proactive problem-solver with a passion for IT infrastructure, systems management and cybersecurity to join our dynamic team. You’ll have hands-on experience with Microsoft environments, including managing Active Directory, Exchange Server (on-premises and cloud), and Office 365. Your skills in PowerShell scripting, troubleshooting and securing enterprise systems will make you an invaluable member of our IT team.

We’re particularly keen on candidates with experience in Azure AD, Office 365 and hybrid setups. A strong understanding of cybersecurity tools and practices, Windows domain environments, networking concepts and experience in help desk ticketing and troubleshooting will help you thrive in this role.

While not essential, experience with Mimecast, LogMeIn Central, Duo MFA, and managing Linux servers would set you apart. If you’re familiar with SQL databases, web servers (like cPanel), scripting languages like Python and EDR/XDR platforms such as ESET, you’ll have an edge. Above all, we value someone eager to learn, adapt and grow with us as we migrate to Office 365 and strengthen our security posture.

Reports to: IT Manager

Key duties and responsibilities

As a Senior IT Systems and Security Administrator, you’ll be at the heart of maintaining and improving our IT infrastructure, ensuring seamless operations across the organisation. From managing day-to-day IT tasks to contributing to our Office 365 migration and enhancing cybersecurity, you’ll have a direct impact on our technical evolution and user experience. You may be required to visit sites if required.

Key Responsibilities

Systems Administration and Server Management

Manage our Windows domain environment.

Oversee on-premises Exchange Server and assist with its migration to Office 365.

Maintain and optimise our shared folder (file server) and MS Work Folders for user document synchronisation.

Patch management – ensure all computers and servers are up to date with the latest security updates.

Server management with Hyper-V – create and maintain new VMs.

Install, configure and upgrade computer hardware and software as needed.

Office 365 Migration and Azure AD

Assist with the ongoing migration to Office 365, including Azure AD setup and SSO configuration.

Implement security best practices for Azure AD and Office 365 environments.

Cybersecurity and Compliance

Monitor and respond to potential security alerts from tools like antivirus, EDR/XDR and firewalls.

Help enforce cybersecurity policies and controls in line with standards such as ISO 27001 or Cyber Essentials Plus.

Support deployment and monitoring of EDR/XDR platforms (experience with ESET XDR is a plus).

Assist with security awareness initiatives, phishing simulations and end-user training.

Manage MFA (e.g. Duo or Microsoft) and conditional access in Microsoft 365.

Conduct basic audits on permissions, data access, user accounts and system security settings.

Email Archiving & Security

Manage MailStore for email archiving to reduce mailbox size.

Work with email filtering and security tools like Mimecast.

User Support

Resolve technical issues through our helpdesk ticketing system. This may involve site visits if issues cannot be resolved remotely.

Provide end-user support with remote access tools and mobile device management software.

Deliver excellent customer service by managing user expectations and resolving issues in a timely manner.

Scripting and Automation

Develop and maintain PowerShell scripts to automate tasks and improve efficiency.

Python scripting experience would be beneficial but is not required.

Skills and attributes

This role could be for you if you have;

At least 3 years’ experience in a similar IT role (preferred).

Proven experience in managing Windows domain environments and Active Directory.

Strong understanding of Exchange Server 2019 and Office 365 administration.

Experience with Azure AD and SSO setup.

Familiarity with IT ticketing systems and providing end-user support.

Basic scripting skills (PowerShell and/or Python).

Interest or experience in cybersecurity practices.

Experience with endpoint detection and response solutions.

Flexible working – you may be asked to work late/weekends when needed

Nice-to-Have Skills:

IT services Management and policy development and implementation experience

Familiarity with Mimecast, LogMeIn Central, Duo MFA, Sage Payroll and Workday Accounts.

Knowledge of Linux server administration and web hosting platforms such as cPanel.

SQL database management and troubleshooting skills.

Understanding of ISO 27001, Cyber Essentials or other IT compliance frameworks.

Experience or interest in AI prompt engineering.

What will you gain?

Be part of a forward-thinking team working on exciting projects like our Office 365 migration and cybersecurity initiatives.

Develop your skills in a supportive and collaborative environment.

Enjoy competitive pay and clear opportunities for progression