Mobile Core Network Engineer | Telecom26 AG | Zug, Switzerland

Telecom26 AG; Zug; On-site; CHF 120,000 - 150,000; Full time

Job summary

Telecom26 AG in Zug, Switzerland seeks an experienced Mobile Core Network Engineer to own, operate, and optimize a live MNO core (HSS/HLR, DRA, IMS/VoLTE, PGW, SMS) for international roaming. The role emphasizes high availability, secure voice and data delivery, and direct impact on global connectivity.

You will monitor, troubleshoot, and remediate incidents, maintain thorough documentation, and collaborate with cross-functional teams.

Qualifications

• 4+ years of hands-on mobile core network operations experience.
• Expertise in HSS/HLR, DRA, IMS/VoLTE, PGW, and SMS core.
• Strong knowledge of SS7, Diameter, and GTP signaling.
• Experience with real-time troubleshooting and alarm monitoring.
• Willingness for 100% on-site work in Zug, Switzerland.

Responsibilities

• Operate, monitor, and troubleshoot live MNO core network.
• Administer HSS/HLR databases for auth and mobility.
• Configure Diameter Routing Agents and signaling systems for roaming.
• Support IMS/VoLTE core platforms for voice and multimedia.
• Manage PGW and GGSN for data routing.
• Ensure SMS routing and inter-operator messaging integrity.
• Perform RCA and incident remediation for roaming issues.
• Maintain network documentation and audit logs.

Skills

Mobile core network operations

MNO engineering

HSS/HLR

DRA

IMS/VoLTE

PGW

SMS core

Troubleshooting network

Wireshark/TShark

Security & high availability

Analytical problem solving

Crisis management

Communication skills

On-site availability

Education

Bachelor’s degree in Telecommunications Engineering, Electrical Engineering, Computer Science

Tools

Jira

Confluence

Kubernetes

Wireshark

Job description

Position Summary

Driving advanced mobile core network operations, global roaming infrastructure, and cross-border telecommunications connectivity in Zug, Switzerland, Telecom26 AG is actively seeking an accomplished Mobile Core Network Engineer for a permanent full-time professional engagement. In this vital technical role, you will operate, troubleshoot, and maintain a live Mobile Network Operator (MNO) core network—including HSS/HLR, DRA, IMS/VoLTE, PGW, SMS, and international roaming architectures. Bringing extensive hands‑on expertise in carrier‑grade telecommunications systems, you will empower international enterprise customers and cross‑border travelers to achieve uncompromised connectivity, high availability, and secure voice and data transmission. This prestigious career opportunity offers competitive remuneration, high technical visibility, and professional growth within a premier global mobile network operator and telecommunications enterprise.

Detailed Job Description

As a Mobile Core Network Engineer supporting Telecom26 AG 100% on-site in Zug, Switzerland, you will take full operational, tactical, and technical ownership of live mobile core components, roaming interfaces, signaling routers, and packet processing nodes. Your day-to-day responsibilities include monitoring subscriber databases (HSS/HLR), managing Diameter Routing Agents (DRA), troubleshooting IP Multimedia Subsystem (IMS) and VoLTE platforms, maintaining Packet Data Network Gateways (PGW), ensuring reliable SMS delivery, handling international roaming faults, and collaborating directly with multidisciplinary engineering squads and recruitment leadership. Furthermore, you will manage application requirements by submitting your updated resume via direct email to [e-mail] or via the official application portal at https://buff.ly/7dv1YiQ.

Key Responsibilities

• Operate, monitor, maintain, and troubleshoot live Mobile Network Operator (MNO) core network infrastructure on a continuous basis.
• Administer Home Subscriber Server (HSS) and Home Location Register (HLR) databases for subscriber authentication and mobility management.
• Configure and manage Diameter Routing Agents (DRA) and signaling transfer systems to ensure seamless roaming interconnectivity.
• Support IP Multimedia Subsystem (IMS) and Voice over LTE (VoLTE) core platforms for high-quality voice and multimedia delivery.
• Manage Packet Data Network Gateways (PGW) and Gateway GPRS Support Nodes (GGSN) for high-throughput mobile data routing.
• Ensure reliable SMS routing, delivery, and inter-operator message transfer across global signaling networks.
• Execute rigorous root-cause analysis (RCA) and incident remediation for international roaming anomalies and core network alerts.
• Maintain meticulous technical documentation, network topology schematics, incident audit logs, and configuration change records.

Required Qualifications & Skills

• Bachelor’s degree in Telecommunications Engineering, Electrical Engineering, Computer Science, or related technical discipline.
• Minimum of 4+ years of progressive professional hands‑on experience in mobile core network operations and MNO engineering.
• Strong, demonstrable operational expertise in HSS, HLR, DRA, IMS/VoLTE, PGW, and SMS core architectures.
• Comprehensive working knowledge and practical proficiency in international roaming protocols, SS7, Diameter, and GTP signaling.
• Deep practical experience in real-time network troubleshooting, packet analysis, and alarm monitoring tools (Wireshark, TShark).
• Solid practical grasp of telecommunications security, firewall hardening, and carrier‑grade high‑availability design.
• Exceptional analytical problem‑solving aptitude, crisis management skills, and professional communication capabilities.
• Mandatory legal work authorization and physical availability for 100% on‑site professional operations in Zug, Switzerland.

Nice-to-Have Skills

• Professional telecommunications certifications such as Cisco Certified Network Professional (CCNP) Service Provider or equivalent vendor credentials.
• Prior professional working experience in top-tier multinational mobile network operators (MNOs), MVNOs, or core vendor engineering teams.
• Hands‑on familiarity with cloud‑native core architectures, virtualized network functions (VNFs), and containerized CNF deployments (Kubernetes).
• Experience utilizing enterprise IT service management and agile tracking platforms (Jira, Confluence) for ticket resolution.
• Active participation in telecommunications standardization bodies, 3GPP forums, or mobile engineering communities.

Application Information

Recruiter: Telecom26 AG Recruitment Division
Contact Name: Telecom26 AG Talent Acquisition Team
Email: [e-mail]
Phone:
Company Website: https://telecom26.ch
Salary/Rate: Market Competitive / Enterprise Telecommunications Package
Deadline: Open until filled (Urgent Zug Mobile Core Network Engineer Opening)
Notice Period: Immediate to 30 Days Preferred
Contract Duration: Permanent / Full-Time 100% On-Site Engagement (Zug, Switzerland)

Recruitment Pro Tip

When applying for this Mobile Core Network Engineer position through Telecom26 AG, ensure your resume explicitly highlights your live MNO core troubleshooting experience, HSS/DRA configuration portfolio, and confirmed on‑site availability in Zug.