Senior Core Network Engineer (HLR/HSS & SDM)

Accountabilities:

• Design, configure, and maintain HLR/HSS subscriber templates, including roaming profiles, APN/PDN contexts, and Camel/Diameter triggers.


• Optimize roaming efficiency through advanced Steering of Roaming (SoR) implementations and sponsor roaming integrations.


• Lead the deployment and management of Full MVNO profiles, including QoS configurations, addressing schemes, and independent network operations.


• Collaborate with roaming partners and external system integrators to refine network configurations and ensure alignment with operational objectives.


• Act as the primary technical contact for HLR/HSS-related projects, change requests, audits, and roadmap initiatives.


• Define, monitor, and improve critical KPIs related to signaling performance, location update success rates, and Diameter transaction throughput.


• Troubleshoot complex signaling and roaming issues using diagnostic and monitoring tools such as Wireshark and telecom testing platforms.


• Contribute to the evolution of subscriber data management strategies, network scalability, and operational automation initiatives.


• Support process optimization and ensure reliable, secure, and high-performing core network operations at global scale.

Requirements

• Extensive experience in telecom core network engineering with strong expertise in HLR, HSS, SDM, or related subscriber management technologies.


• Deep understanding of MAP (SS7) and Diameter protocols, including S6a/S13 interfaces.


• Experience working within MVNO, MVNE, or multi-tenant mobile network environments.


• Strong knowledge of roaming technologies, Steering of Roaming (SoR), and sponsor IMSI management.


• Familiarity with GSMA IREG standards and understanding of TADIG processes and roaming settlement impacts.


• Proven troubleshooting capabilities for complex signaling and roaming issues using tools such as Wireshark, Mobileum, Roamware, or SIGOS.


• Experience collaborating with external roaming partners, vendors, and system integrators in complex technical projects.


• Knowledge of VoLTE roaming, SMSoIP, or 5G UDM/AUSF technologies is considered a strong advantage.


• Familiarity with cloud-native network functions (CNF), containerized deployments, or telecom virtualization environments is a plus.


• Scripting and automation skills using Python, Bash, or similar technologies are highly desirable.


• Excellent analytical thinking, communication, and problem-solving skills with the ability to work effectively in distributed teams.

• Competitive salary package aligned with experience and technical expertise.


• Fully remote work environment with flexibility and autonomy.


• Generous paid time off and work-life balance support.


• Wellness and professional development allowances to support personal growth and continuous learning.


• Opportunity to work on globally scaled telecom infrastructure and cutting-edge mobile connectivity technologies.


• Collaborative international environment with exposure to innovative engineering projects.


• Participation in company retreats, team-building initiatives, and global networking opportunities.


• Inclusive and diverse workplace culture focused on collaboration, innovation, and professional development.


• Potential healthcare coverage and additional employee benefits depending on employment terms and location.

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