Senior Active Directory Engineer

Location: London, UK

Contract: 6 months Work Mode: Office-based (Minimum 4 days onsite) Rate: £550 per day Additional Requirement: Night shifts may be required depending on scheduled changes

About the Role

We are seeking an experienced Senior Active Directory Engineer to support a major enterprise infrastructure and security transformation programme.

You will assess, design, and remediate complex Microsoft Active Directory environments, working closely with infrastructure, security, and application teams to deliver AD tiering, security remediation, and operational improvements.

Key Responsibilities

• Review and improve existing Active Directory tiering policies.
• Assess cross-tier dependencies and identify risks.
• Review and remediate service accounts and scheduled tasks.
• Implement changes to AD groups, users, and server objects.
• Validate functionality and access post-change.
• Prepare deployment plans, runbooks, and remediation plans.
• Collaborate with stakeholders to deliver successful outcomes.

Essential Skills & Experience

• Strong hands-on experience with Microsoft Active Directory.
• Expertise in AD architecture: forests, domains, trusts, sites, and replication.
• Experience managing large-scale enterprise AD environments.
• Strong understanding of AD Tiering (Tier 0, 1, 2) and security models.
• Experience with OU design, delegation, and Group Policy inheritance.
• Ability to perform gap analysis and provide clear recommendations.

Desirable Skills

• Experience with Microsoft Entra ID/cloud synchronisation.
• Exposure to PAM/PIM/identity governance tools.
• Experience with Jira, Azure DevOps, and ITSM tools.
• Strong communication and stakeholder management skills.

Why Apply?

• Work on enterprise-scale security and identity transformation programmes.
• Gain exposure to modern Microsoft technologies and security frameworks.
• Join a collaborative, high-performing team.

• Strong hands-on experience with Microsoft Active Directory.
• Expertise in AD architecture: forests, domains, trusts, sites, and replication.
• Experience managing large-scale enterprise AD environments.
• Strong understanding of AD Tiering (Tier 0, 1, 2) and security models.
• Experience with OU design, delegation, and Group Policy inheritance.
• Ability to perform gap analysis and provide clear recommendations.

Desirable Skills

• Experience with Microsoft Entra ID/cloud synchronisation.
• Exposure to PAM/PIM/identity governance tools.
• Experience with Jira, Azure DevOps, and ITSM tools.
• Strong communication and stakeholder management skills.