Mobile SDM Expert

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?

Georgi Kodjaivanov is looking for a new team member.

We are looking for an experienced Mobile SDM Expert to manage and evolve subscriber data and mobility management platforms across 2G, 3G, 4G/5G NSA, and 5G Standalone networks.

The role includes responsibility for key SDM systems (HLR, HSS, UDM, AUC, PGW) and supporting the transition to cloud-native UDM/UDR-based 5G architecture, with a strong focus on automation and operational efficiency.

Your daily routine would include:

• Operating, maintaining, and optimizing key SDM platforms such as HLR, HSS, AUC, PGW, UDM, and 5G SA modules (UDR, AUSF).
• Managing subscriber data processes across GSM, UMTS, LTE, 5G NSA, and 5G SA networks.
• Troubleshooting and analyzing complex signaling flows (MAP, Diameter, GTP, HTTP/2).
• Planning and executing platform upgrades, capacity expansions, and software lifecycle activities.
• Designing and implementing automation for operational tasks, monitoring, provisioning flows, and KPI tracking.
• Supporting virtualization initiatives and cloud transformation toward a cloud-native SDM environment.

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

• 5+ years of experience in Voice Core Network.
• Strong knowledge of network protocols MAP, Diameter, S6a, S13, S6d.
• Experience working in international environment, supporting different systems and countries.
• Experience managing vendors.
• Excellent communication skills.

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.

Not sure yet? See us in action in our A1 Blog.
Sounds good? Apply now!
Only shortlisted candidates will be contacted.