Key Skills

Job Description

Only Candidates holding EU citizenship or a Dutch passport are eligible to apply. About the Role As a Platform Operations Expert – Windows Server · Red Hat RHEL · Active Directory PKI – you will take ownership of critical enterprise identity and operating system platforms that underpin authentication, access, and system stability across the organization. This is a high-impact, hands-on role focused on maintaining the health, security, and resilience of Active Directory, Windows Server, and Red Hat Enterprise Linux environments. You will operate at the heart of enterprise infrastructure, ensuring seamless authentication services, resolving complex cross-platform issues, and safeguarding identity services that business operations depend on every day. In This Role, You Will Monitor and resolve Active Directory replication and domain controller health issues to ensure directory consistency and availability Troubleshoot Kerberos authentication failures, including time skew, SPN conflicts, and ticketing errors Maintain SYSVOL integrity and manage Group Policy (GPO) changes across enterprise environments Respond to and remediate large-scale authentication outages impacting multiple systems and services Diagnose and fix Windows Server and Red Hat RHEL service failures, including performance degradation and resource saturation Execute daily and weekly health checks across domain controllers, RHEL hosts, and PKI infrastructure Maintain and continuously update a dependency map covering DNS, VMware, Active Directory, and backup systems Collaborate with infrastructure, security, and cloud teams to resolve complex, cross-domain incidents Work Model We believe hybrid work is the way forward as we strive to provide flexibility wherever possible. Based on this role’s business requirements, this is a hybrid position. Regardless of your working arrangement, we support a healthy work-life balance through our wellbeing initiatives. The working arrangements may evolve depending on client and project requirements. What You Need to Have to Be Considered Strong experience in enterprise identity and operating system operations Advanced expertise in Active Directory — replication, FSMO roles, SYSVOL, ADSI Deep understanding of Kerberos authentication — ticket lifecycle, SPN management, NTP synchronization, delegation Hands-on experience with Group Policy — GPO creation, RSoP analysis, ADMX templates Solid experience in PKI (ADCS) — certificate authority hierarchy, certificate templates, CRL/OCSP management Advanced knowledge of Windows Server — AD DS, DNS, DHCP, Event Viewer, Performance Monitor Initial experience with Red Hat Enterprise Linux (RHEL) — systemd, SSSD/realmd (AD integration), SELinux, firewalld Initial experience in PowerShell and Bash scripting for automation and troubleshooting Proven ability to diagnose and resolve complex identity and OS-level issues in enterprise environments These Will Help You Stand Out Experience managing large-scale, multi-domain AD environments Exposure to hybrid identity setups or integration with cloud identity providers Familiarity with automation and configuration management tools Strong background in incident management and root cause analysis (RCA) Knowledge of ITIL frameworks and structured operational processes What We Offer At Cognizant Netherlands, we provide an environment that supports your technical growth and operational excellence: Competitive salary Access to Udemy and Cognizant Academy NS business card 25 paid holidays per year Laptop and smartphone Pension scheme Technology-driven organization Open team spirit International working environment We’re excited to meet professionals who understand the critical nature of identity platforms and can ensure their reliability at scale. Even if you meet most—but not all—requirements, we encourage you to apply.

Core Responsibilities

You will manage and maintain critical enterprise identity and operating system platforms, including Active Directory, Windows Server, and Red Hat RHEL. The role involves resolving complex authentication issues, performing health checks, and collaborating with infrastructure teams to ensure system stability.

Requirements

Candidates must have strong experience in enterprise identity operations, specifically with Active Directory, Kerberos, and Windows Server. Proficiency in RHEL, scripting, and PKI infrastructure is required, along with EU citizenship or a Dutch passport.

Benefits

• Competitive salary
• Udemy access
• Cognizant Academy
• NS business card
• 25 paid holidays per year
• Laptop
• Smartphone
• Pension scheme