Sr. PKI Engineer

TEKsystems•Berwyn, IL

3d•$75 - $85•Onsite

About The Position

PKI Engineer to design, implement, and operate enterprise-grade Public Key Infrastructure (PKI) services with a strong focus on Microsoft Active Directory Certificate Services (AD CS) and Active Directory (AD) integration. Handson implementation and integration knowledge of certificate lifecycle management, CA hierarchy governance, enrollment automation, HSM-backed key protection, CA backup restore, migration and integration with platforms such as Windows Server, Linux, network/security devices, cloud providers, MDM/EPP, and zero-trust tooling. Subject matter expert for cryptographic standards, certificate-based authentication, and PKI security controls across the organization.

Requirements

ADCS (Active Directory Certificate Services)
Integrate PKI with Active Directory (AD forests/domains, ADCS, AIA/CDP locations, GPOs)
Deploy, Configure, Implement, Install,
8+ years in Security Engineering/Identity Infrastructure, including 5+ years hands-on with Microsoft AD CS and enterprise Active Directory with managing CA infra
Proven experience designing, deploying, and operating multi-tier Microsoft PKI (offline root, issuing CAs) in large/complex environments.
Deep knowledge of X.509, CRL/OCSP, EKU/KU, SANs, key algorithms and sizes (RSA/ECC), hashing (SHA-2), and certificate validation paths.
Strong PowerShell and Windows Server administration; GPOs, autoenrollment, templates, AIA/CDP configuration.
Experience with 802.1X/EAP-TLS, TLS/mTLS, VPN auth, and device/user certificate issuance at scale.
HSM experience (e.g., nCipher/Entrust/Thales) for CA key management.

Nice To Haves

Key sizes, algorithms (RSA, ECC and PQC) encryption and hashing.
Pki, ADCS, Certificate Management, Vault Management, Security
Top Skills Details: Pki,ADCS,Certificate Management,Vault Management

Responsibilities

Design and maintain enterprise PKI architectures (Root CA, Policy CA, Issuing CA) with offline/air gapped roots, secure key ceremonies, key usage, and issuance workflows and robust CRL/OCSP distribution.
Engineer solutions for mutual TLS, 802.1X (wired/wireless/VPN), device identity, code signing, S/MIME, BitLocker, and disk/volume encryption certs.
Implement HSM-backed key storage for CAs and code signing; lead key ceremonies, disaster recovery designs.
Own certificate lifecycle management (issuance, renewal, revocation) including automation via Intune, GPO/Autoenrollment, SCEP/NDES, ACME, or MDM connectors.
Manage CRL/OCSP publication, monitoring, and availability, design highly available, geo-distributed revocation endpoints.
Implement scripting/automation (PowerShell, APIs) for bulk issuance, inventory, renewal, and drift detection. Enabling separation of duties for secure operation of PKI infrastructure
CA backup, restore renewal and migration strategy
Apply strong key management practices (FIPS 140-2/140-3), certificate assurance levels, and secure CA hardening baselines.
Regularly perform PKI risk assessments, access reviews, and control testing (e.g., template permissions, EKU misuse, issuance constraints).
Lead root cause analysis and incident response for certificate/PKI-related outages or security events.
Maintain alignment with NIST, CAB Forum, Microsoft Security Baselines, and internal compliance frameworks (e.g., SOX, PCI, HIPAA, ISO 27001) as applicable.