3Rd Line Infrastructure Engineer

IO Associates; Bridgwater; Hybrid; GBP 46,000 - 55,000; Full time

Job summary

A client company in the UK is seeking a 3rd Line Infrastructure Engineer to design and implement secure infrastructure solutions. The role involves delivering both on-premises and Azure-based infrastructure, managing network security solutions, and hardening Microsoft systems. Strong experience with Microsoft technologies and hands-on knowledge of Active Directory is essential. This position offers flexible working arrangements and a chance to work on complex, security-focused projects.

Qualifications

• Strong experience with on-premises infrastructure and Microsoft technologies.
• Hands-on knowledge of Active Directory, Group Policy, WSUS and Certificate Services.
• Experience with multi-factor authentication, virtualization and network security appliances.

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.

Skills

On-premises infrastructure

Microsoft technologies

Active Directory

Group Policy

Network security appliances

Vulnerability management

Security frameworks

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.