Challenge mastered.


Did you know that A1 Bulgaria is partnering with some of the largest tech companies to bring innovations to its customers?

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.

All about our company is just a click away @

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?

Spasimir Arsov is looking for a new team member:

Senior Windows System Administrator

Within the "Enterprise Hybrid Platforms" group, the "Enterprise Data Systems" team is responsible for designing and operating ICT infrastructure solutions for internal customers. The technological focus is on the Windows operating system. Now we are looking for an experienced Senior Windows System Administrator who has the skills and dedication to develop IT systems and infrastructure that are in a service of A1 Group.

Your daily routine would include:

  • Managing basic MS Services with focus on AD Directory Services, Azure AD Connect, Federation Services;
  • Maintaining the server infrastructure according to the vendor recommendations;
  • Evaluating and modifying systems performance;
  • Actively support the life cycle of the operated server systems;
  • Ensuring the operational adherence of the Service Level Agreements (SLA) and Quality Indicators (KPI) within a 24/7 Operation with on-call duty.

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

  • Minimum 3 years of experience in the ICT environment as a System administrator;
  • Depth knowledge of MS Active Directory, Azure AD Connect, PKI, DNS, DHCP and hybrid cloud scenarios;
  • Depth knowledge of authentication and single sign-on technologies and SAML, oAuth, Kerberos, LDAPs;
  • Very good written and spoken English skills.

You will need also:

  • MS AD Domain Service, Azure ATP;
  • MS DHCP, DNS, Print, File Services;
  • PowerShell & Scripts;
  • User Management;
  • Logging local and central.

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.

PS It’s all very real, we’ve got all kinds of awards as well to prove it.

Deadline for applications:
28 February 2023

Only shortlisted candidates will be contacted.