Infrastructure Engineer

Onyx-Conseil; Manchester; On-site; GBP 89,000 - 111,000; Full time

Job summary

Onyx-Conseil is seeking an experienced Senior Identity Infrastructure Engineer to support and maintain core identity infrastructure platforms underpinning the organisation's Identity and Access Management (IDAM) services. The role is based in secure facilities in Manchester or Inverness with five days onsite.

You will administer and optimize Active Directory, PKI, DNS, and Group Policy, delivering L2/L3 operational support and security hardening to ensure availability, resilience and trusted

Job description

Role Title: Infrastructure Engineer

Location: Manchester or Inverness, 5 days onsite

Duration: 13/03/2027

£519.10 inside IR35 Per Day

Role Overview

We are seeking an experienced Senior Identity Infrastructure Engineer to support and maintain the core identity infrastructure platforms that underpin the organisation's Identity and Access Management (IDAM) services.

The successful candidate will be responsible for the administration, support, security, and continuous improvement of the Active Directory, PKI, DNS, Group Policy, and authentication infrastructure. They will work closely with the wider IDAM team, supporting critical identity services and providing L2/L3 operational support across the identity estate where required.

This role requires a highly capable infrastructure engineer with deep expertise in Microsoft Active Directory and Public Key Infrastructure (PKI), combined with a strong understanding of enterprise identity technologies and authentication services.

The position is based within secure facilities in either Inverness or Manchester, working closely with security, engineering, and IDAM teams to ensure the availability, resilience, and security of critical identity platforms.

Key Responsibilities

Active Directory Infrastructure

• Administer and maintain enterprise Active Directory forests, domains, and domain controllers.
• Manage Active Directory Sites and Services, replication topology, trusts, and directory services infrastructure.
• Administer AD-integrated DNS and support authentication services across the enterprise.
• Manage and maintain Group Policy architecture, including policy design, implementation, troubleshooting, and lifecycle management.
• Support Active Directory backup, recovery, disaster recovery, and business continuity processes.
• Monitor platform health, performance, security, and replication.
• Support Active Directory upgrades, migrations, consolidation projects, and infrastructure improvements.
• Implement and maintain Active Directory security hardening standards and privileged access controls.

We are committed to fostering an inclusive, equitable and accessible workplace where everyone feels valued and supported.

We welcome applications from all individuals, regardless of background or identity, and we encourage candidates who may not meet every listed requirement to still apply.

If you require any adjustments or support during the recruitment process, please let us know and we will work with you to ensure a fair and accessible experience.

Please Note: If a high volume of applications is received, only candidates shortlisted will be contacted.