IT Administrator – Security & Support

About the role

Assystem is looking for an IT Administrator to join its team and help protect the organisation from cyber threats while delivering reliable IT services. You will work on a variety of platforms, from Windows endpoints to Microsoft 365, and support both day‑to‑day operations and large‑scale projects.

Key responsibilities

• Act as escalation point for complex incidents and service requests.
• Diagnose and resolve issues across endpoints, M365, networking, and business applications.
• Build, configure and support laptops and user devices.
• Administer Active Directory and manage user access.
• Support onboarding/off‑boarding and permissions management.
• Contribute to security compliance (e.g., Cyber Essentials, vulnerability remediation).
• Assist with infrastructure operations and large‑scale IT projects such as office moves and migrations.
• Follow change control processes and maintain technical documentation and SOPs.
• Identify service improvements and automation opportunities.
• Participate in on‑call support rotation.

Required profile

• Minimum 3 years experience in IT support or systems administration.
• Proven experience with Windows environments and Microsoft 365 services.
• Relevant certifications (e.g., Microsoft, CompTIA) are desirable.
• Experience working in an ITIL‑aligned environment (incident, change, problem management).

Required skills

• Windows operating system administration.
• Microsoft 365 (M365) administration.
• Active Directory management.
• Endpoint management and troubleshooting.
• Basic networking knowledge.
• Security compliance frameworks (Cyber Essentials, vulnerability remediation).
• ITIL process understanding.

What we offer

• Hybrid working arrangement.
• Flexible working hours.
• 8 % company pension contribution (plus personal contribution).
• 25 days paid annual leave plus bank holidays, with buy/sell option.
• Professional fees reimbursement.
• Employee referral scheme.
• Competitive sick pay, income protection and death‑in‑service cover.
• Free digital gym access and 24/7 employee support line.