Strength. Care. Growth
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.
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.
Apply now!
Every internal candidate will be invited for an interview.
Every colleague, who has changed their position in the company, will receive an individual bonus of 1000 euro for an educational course of their choice.
Refer a friend for this position and get a bonus of 250 euro under the Employee referral program!
