Active Directory System Specialist

Strength. Care. Growth

A1 Competence Delivery Center is a vital component of A1’s telecommunications business. Acting as an expertise hub, CDC is dedicated in delivering full range of high-quality IT, network, financial and HR to support A1’s operations across all OpCos, independent of location.

Using the power of A1 Group and leveraging bynergies, CDC enables transparency of resources, key skills and knowledge expansion and personal career growth opportunities’, paired with job stability.

You will know we are the right place for you, if you are driven by:

• Opportunities to learn and build your career;
• Meaningful work in a stable and fast-paced company;
• Diversity of people, projects, and platforms;
• A supportive, fun, and inspiring place to work.

Would you like to join us?

Milica Vucicevic is looking for a new team member.

We are expanding the Customer Integration team within IT Services Department of the A1 Competence Delivery Center. Be a part of this exciting journey!

As an Active Directory System Specialist, you will be responsible for the operation, maintenance, and continuous improvement of secure and scalable identity and PKI services across hybrid IT environments. This role focuses on managing Active Directory infrastructure, ensuring compliance and security, and supporting modernization initiatives in both on-premises and cloud-based systems. You will work closely with cross-functional teams in a collaborative and international environment.

Your daily routine would include:

• Operate and maintain Active Directory environments, including Directory Services (DS), Certificate Services (CS), Federation Services (FS), and Group Policy Management.
• Provide support for Public Key Infrastructure (PKI), including certificate issuance, lifecycle management, and integration with authentication systems.
• Support hybrid identity solutions, particularly Entra ID Connect and related Entra ID components.
• Ensure the security, compliance, and reliability of identity and PKI infrastructure services.
• Participate in the lifecycle management of AD-integrated services, including authentication flows and federation scenarios.
• Automate routine administrative tasks using PowerShell and contribute to infrastructure improvements.
• Collaborate with internal teams to deliver stable and secure identity services.
• Maintain documentation of architecture, security concepts, operational procedures, and service dependencies.
• Participate in 24/7 operations with on-call responsibilities, ensuring service levels are met.

We’ll know you can make it if you have:

• Completed secondary education or equivalent IT qualification.
• Experience with Microsoft Active Directory (DS/CS/FS), Group Policy Management, DNS, DHCP, and certificate-based authentication.
• Knowledge of PKI technologies, including AD Certificate Services and key management.
• Understanding of authentication protocols such as Kerberos, LDAPs, SAML, OAuth, and Single Sign-On (SSO).
• Experience with PowerShell scripting for automation and operational support.
• Familiarity with hybrid identity and cloud-based IAM solutions, especially Entra ID Connect.
• Awareness of domain security best practices, including hardening and layered security.
• Experience with ITSM tools such as ServiceNow is a plus.
• Good command of English; additional languages are an advantage.
• Willingness to learn and grow in the field of identity and PKI technologies.

Our gratitude for the job done will be eternal, but we’ll also offer you:

• Innovative technologies and platforms to “play” with;
• Modern working environment for your comfort;
• Friendly, ambitious, and motivated teammates to support each other;
• Thousands of online and in-person learning opportunities to grow;
• Challenging assignments and career development opportunities in multinational environment;
• Attractive remuneration package;
• Flexible working schedule and opportunity for home office;
• Numerous additional goodies, including, but not limited to free A1 services, discounts, health insurance and services, sports center, childcare, team and family events, etc.

You want to learn more? See us in action in our A1 Blog.
Sounds good? Apply now!
Only shortlisted candidates will be contacted.