Windows Active Directory L3 Support Engineer – NTLM, Power Shell, AD, LDAP Signing, Zero Trust, Cyber Ark
Toronto, ON - Hybrid (4 Days WFO)
This role is responsible for strengthening and modernizing Active Directory services across production and disaster recovery environments. The engineer will manage domain controller expansion and replacement, improve authentication and directory security controls, remediate privileged-access weaknesses, and harden Group Policy and network configurations to reduce attack paths and support resilient enterprise identity services.
Key Responsibilities
Deploy and configure additional domain controllers across primary and disaster recovery sites, including DC01 and DC02, to improve availability, resilience, and site-level recovery readiness.
Replace legacy Windows Server 2016 domain controllers and support platform modernization activities with minimal service disruption.
Implement production and development network segmentation to reduce lateral movement risk and align identity services with Zero Trust principles.
Maintain Active Directory health across replication, authentication, DNS integration,



and Group Policy processing.
Security Hardening and Access Control
Enable Extended Protection for Authentication (EPA) and require SSL/TLS for privileged HTTP-based services such as AD CS and ADWS to reduce credential relay and man-in-the-middle exposure.
Enforce SMB signing to help prevent tampering and NTLM relay over SMB sessions.
Disable NTLMv1 and strengthen LDAP protections by enforcing LDAP signing and channel binding / LDAPS for directory communications.
Implement Kerberos armoring, restrict unconstrained delegation, tighten delegation permissions on privileged accounts, and address unknown delegation entries.
Remediate excessive privilege findings, including Admin Count issues, GPO-deployed file exposure, missing protective ACLs, and privileged accounts not enrolled in Protected Users.
Remove insecure legacy access patterns such as Pre-Windows 2000 compatible group usage and administrator logon allowances through Group Policy.
Enforce stronger password and privileged

📌 Windows active directory l3 support engineer (Toronto)
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