Sr. Systems Engineer (Active Directory)

Berkley Technology Services

Manassas (VA)

On-site

USD 107,000 - 198,000

Full time

14 days+

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Job summary

Berkley Technology Services in Manassas, VA is seeking a Sr. Systems Engineer (Active Directory) to design, implement, and manage our enterprise AD/Entra Hybrid infrastructure.

This senior role emphasizes architecture, security, and automation over routine administration. You will build scalable AD solutions, integrate IAM with Okta/Auth0 and Entra ID, and mentor teammates while collaborating with security, networking, and application development teams.

Qualifications

Active Directory architecture: extensive, hands-on design and management of large multi-forest AD environments (5+ years).
Experience with DNS, DCs, GPOs, Sites, Services, trusts.
Experience with IAM integrations (Okta/Auth0, Entra ID, MFA).

Responsibilities

Design and implement AD architecture aligned with security needs.
Maintain AD, forests, domains, OUs, and GPOs; troubleshoot replication and DNS.
Automate admin tasks across AD and Entra; monitor health.
Ensure AD security through PAM, RBAC, hardening.
Document designs, standards, and SOPs.
Lead projects with PM, Account Mgmt, and customer teams; mentor staff.

Skills

Active Directory

DNS

GPOs

Okta

Auth0

Entra ID

MFA

RBAC

PAM

Scripting

Education

Bachelor's degree in Computer Science

Tools

Netwrix Directory Manager

Windows Server

Microsoft Entra ID

Okta

Auth0

Job description

Company Details

\"Thoughtful Minds | Empowering Possibilities\"
W. R. Berkley Corporation is comprised of 60+ businesses alongside Berkley Technology Services (BTS) and other shared services groups. Here at Berkley Technology Services, the core of our success is our people. Our teams bring their own unique perspective and experiences which enables us to translate the needs of our business to deliver adaptable, secure solutions while providing an unmatched user-focused experience.
At BTS, our teams thrive in Berkley’s decentralized model, leveraging the power of being part of a long-standing, heritage brand with extensive expertise while innovation and being entrepreneurial is encouraged. Internally, we operate as a relatively flat organization valuing communication and feedback. We pride ourselves in an open-door policy where no one is treated differently based on title, fostering a culture of trust, transparency, and engagement.

Mission

We Believe in the value of every voice
Translate needs into capabilities
Secure the future of Berkley

Vision

Be the foundation of Berkley through adaptable solutions, resilient environments, and an unmatched experience.
Come join us as we push forward into the future of industry-leading technological solutions.
The Company is an equal employment opportunity employer.

Responsibilities

The Sr. Systems Engineer (Active Directory) is an experienced Active Directory specialist to design, implement, and manage our enterprise-wide Active Directory /Entra Hybrid infrastructure. This is a highly technical, senior-level position requiring expertise in AD architecture, security best practices, and automation. This is not an administrator role. The ideal candidate will be a subject matter expert in AD technologies, with a proven track record of designing scalable, secure, and resilient AD solutions for complex environments. Experience with Active Directory Integrated DNS and Domain Controller administration is essential. This position is on the Platform Identity Management team with a focus on owning Active Directory as a Source of Truth (SOT) for Identity. This team is also responsible for Entra and Auth0 identity services, AD CS PKI, and Identity authN / authZ.

Systems Planning and Implementation: Serve as the enterprise subject matter expert (SME) for Active Directory architectural designs, ensuring they align with business needs and security requirements.

AD Management: Develop, implement, and maintain the AD architecture, including forests, domains, organizational units (OUs), and Group Policies (GPOs). Perform advanced troubleshooting and root cause analysis for complex AD infrastructure issues, including replication, DNS, and authentication.

Scripting/Automation : Utilize DevOps and Platform Engineering principles to support the automation of administrative tasks across the Active Directory and Entra environment. Ensures critical AD roles and Entra Identity services have health monitoring and alerting.

Security Standards: Ensure the security of the AD environment by implementing best practices for authentication, authorization, and auditing. Perform periodic Domain Controller security hardening.

Documentation: Develop and maintain comprehensive documentation, including architectural designs, configuration standards, and standard operating procedures (SOPs).

Project and cross-matrix Leadership: Lead projects, working directly with Project Management, Account Management, and Customer teams. Collaborate and consult with other Berkley Technology Services teams, including security, networking, and application development to ensure seamless integration and operational efficiency.

Mentorship: Mentor and cross-train technical staff, peers, and subordinate team members in AD/ IAM technologies and best practices.

ITIL Standards: Participate and adhere to defined ITIL standards for incident, request, and change management.

On Call Rotation (PIC) is required as part of the Platform Identity Management Team.

Qualifications

Active Directory Architecture: Extensive, hands-on experience in designing, implementing, and managing large, complex, multi-forest Active Directory environments (Minimum 5 years of experience) . Deep expertise in AD components such as DNS, DC, GPOs, Sites and Services, and trusts.
Netwrix Directory Manager (NDM): Proven experience implementing, configuring, and managing NDM (or similar products ) to provide a policy-based delegated AD administration and governance model within a least -privilege d security framework.
Windows Platforms: In-depth knowledge of Windows Server operating systems (2016, 2019, 2022, 2025) and their roles within an enterprise environment.
Security Expertise: Strong understanding of AD security best practices, including privileged access management (PAM), role-based access control (RBAC), and security hardening techniques. Previous experience with server hardening within an AD environment is preferred.
Identity & Access Management (IAM): Ability to integrate Active Directory with IAM solutions aligned with Zero Trust, identity governance, and adaptive authentication concepts . Previous experience with Okta/Auth0, Microsoft Entra ID, MFA , LDAPS preferred.
Communication: Excellent written and verbal communication skills, with the ability to document and convey complex technical concepts to both technical and non-technical audiences.
Disaster Recovery: Experience with disaster recovery and business continuity planning for AD and its role within the organization's technology stacks.
AI Tools: Demonstrate comfort using AI-assisted tools in a professional context; approach AI as a standard part of modern workflow rather than a specialized or optional capability.

Education Requirement