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A1 Bulgaria

Windows Advanced System Administrator

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Sofia - Infrastructure Sofia

The job listing is published in the following categories

Infrastructure 327 SysAdmin 31
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    Tech Stack / Requirements

    Strength. Care. Growth

    Did you know that A1 Bulgaria is working on international projects as well?

    Our wide portfolio has long past the telecom services, and we are now offering digital solutions to millions of corporate, public, and private customers.

    State-of-the-art technology, the latest innovations, and extremely talented professionals in various areas help us deliver the best-in-class products, services, and customer experience.

    You’ll know A1 Bulgaria is 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?

    Hristo Popov is looking for a new team member.

    Your daily routine would include:

    • Managing Microsoft Services with focus on AD Directory Services, DNS, DHCP, File, Print, AD Connect, Federation Services;
    • Ensuring the operational adherence of the Service Level Agreements (SLA) and Quality Indicators (KPI) within a 24/7 Operation with on-call duty;
    • Windows Server Integration – OS configuration and OS updates, Server Networking, Role and Feature installation, including cluster configuration and validation, SCCM agent installation, etc;
    • Incident, Problem and Change management – resolving incident/service requests and alerts generated by SCOM;
    • Deployment/Patching of operating system updates via System Center Configuration Manager (SCCM);

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

    • In-depth knowledge of MS Active Directory, Entra AD Connect, PKI, DNS, DHCP and hybrid cloud scenarios
    • In-depth knowledge of authentication and single sign-on technologies and SAML, oAuth, Kerberos, LDAPs;
    • Good working knowledge with MS AD Domain Service, Azure ATP;
    • Scripting experience with PowerShell & Scripts;
    • Experience with User Management and with local and central logging as well as Group Policy Management;
    • Experience with MS AD Federation Service/SSO/MFA, MS AD Certificate Service, MS Key Management Service, as well as MS DHCP, DNS, Print, File Services.

    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!

    Deadline for applications: 16 July 2025

    Only shortlisted candidates will be contacted.

    Submit your application