3rd Line Infrastructure Engineer

  • IO Associates
  • Dec 19, 2025
Full time I.T. & Communications

Job Description

3rd Line Infrastructure Engineer
Permanent Up to £55,000 Bristol (hybrid)

Our client is seeking a 3rd Line Infrastructure Engineer to design, implement and secure on-premises and cloud infrastructure solutions. This is a hands-on role based between the Bristol office and remote working from home.


Key Responsibilities
  • Design and deliver secure on-premises and Azure-based infrastructure

  • Implement network security solutions including firewalls, VPNs and segmentation

  • Harden Microsoft Server/Desktop platforms using Group Policy and security baselines

  • Manage Active Directory, MFA (YubiKey/Authenticator) and access controls

  • Deploy endpoint security, EDR, Defender and DLP solutions

  • Perform vulnerability assessments using Tenable and drive remediation

  • Deploy applications using on-premises tools and Intune


Skills & Experience
  • Strong experience with on-premises infrastructure and Microsoft technologies

  • Hands-on knowledge of Active Directory, Group Policy, WSUS and Certificate Services

  • Experience with MFA, virtualisation and network security appliances

  • Understanding of vulnerability management, SIEM and endpoint protection

  • Familiarity with security frameworks (ISO 27001, NIST, CIS, Cyber Essentials)

  • Hold SC or DV clearance.

A great opportunity to work on complex, security-focused infrastructure projects with flexible working and clear progression opportunities.


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