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.
Your daily routine would include:
- Design, deploy, operate, and optimize IMS & VoLTE/VoWiFi/VoNR voice core platforms for all A1 OpCos.
- Manage and optimize core elements, including P?CSCF, I?CSCF, S?CSCF, SBC, TAS, MRF, and MGW.
- Ensure stability, performance, and high availability of voice services 24x7.
- Troubleshoot complex SIP/Diameter signaling flows and perform root-cause analysis.
- Support device testing, interoperability testing, regulatory feature validation (e.g., lawful interception, emergency call routing), and new service introduction.
- Implement automation for configuration management, alarms, KPIs, and routine operational tasks.
- Develop scripts and tools to improve core network reliability and operational speed.
- Collaborate closely with vendors on upgrades, migrations, capacity expansion, and deployment of new features.
- Contribute to the transformation toward cloud-native IMS and Voice over 5G (VoNR).
We’ll know you can make it if you have:
- Strong expertise in 3GPP standards, IMS, VoLTE, VoWiFi, and SIP signaling.
- Deep knowledge of Diameter, RTP/RTCP, and other telecom signaling protocols.
- Familiarity with EPC and 5GC voice architecture and features, such as SRVCC and SMS over IP.
- Experience analyzing packet captures using tools like Wireshark and vendor-specific trace tools.
- Practical experience with automation tools, e.g., Ansible; Terraform is a plus.
- Scripting skills in Python, Bash, or similar languages.
- Ability to automate repetitive operational tasks and build dashboards or monitoring tools.
- Hands-on experience with virtualized core networks (VMware, KVM).
- Understanding of cloud-native architectures, containerization (Docker), and Kubernetes.
- Familiarity with CI/CD pipelines, microservices, and Git-based workflows is an advantage.
Nice to Have:
- Experience with 5G SA VoNR (IMS over 5GC).
- Knowledge of CSFB, OMR, and supplementary services.
- Hands-on experience with vendor platforms, such as Ericsson, Nokia, Mavenir, and Oracle SBC.
- Exposure to observability and monitoring stacks, including Prometheus, Grafana, and ELK.
- Experience building internal tools or APIs to support network operations.
Apply now!
