Senior Engineer

Senior Engineer – Mobile Core, Telecoms required to join a forward-thinking and fast-growing company headquartered in Gibraltar. Well established technology company, with deep ties to Gibraltar. As the Senior Engineer Collaborate with other key teams including Mobile Packet Core, Fixed Voice, Radio Access, Information Systems IS & IT, Roaming Services and NOC.

What’s on offer to you?

• Competitive salary and comprehensive benefits, including private health insurance.
• A wellness allowance and access to wellness programs.
• The opportunity to work in a vibrant, collaborative, and forward-thinking telecoms company.

What You Will Be Doing

• Support our Mobile Core network elements ensuring compliance with KPIs and SLAs.
• Maintain service availability, performance, and compliance with operational processes.
• Take part in 24×7 on-call rotation for proactive and reactive support.
• Contribute to service rollouts and coordinate with external suppliers when required.
• Address issues escalated by Customer Care and internal stakeholders.
• Open and manage tickets with vendors, ensuring proper follow-up.
• Take ownership of service degradation events and major incidents, ensuring rapid response.
• Identify root causes and implement mitigation actions to reduce service impact.
• Collaborate across teams to ensure timely resolution
• Troubleshoot complex issues across signalling protocols
• Capture and analyse protocol traces using internal or external tools
• Act as technical owner, overseeing platform support.
• Monitor KPIs, analyse performance trends, and support improvement forums.
• Review network changes to ensure they do not negatively impact service performance.
• Oversee alarm handling and ensure timely corrective actions
• Execute periodic system checks, backups, and monitoring activities.
• Perform resilience assessments and analyse failure scenarios.
• Collaborate with vendors to drive continuous improvements and optimizations.
• Configure new number ranges on the network (MSISDNs, IMSIs, Global Titles, Number Portability Prefixes).
• Support the rollout and maintenance of SIP interconnections with external carriers.
• Configure or change routing in CS or/and IMS networks
• Maintain and update operational procedures and documentation (SOPs)
• Support configuration and troubleshooting of roaming services, including VoLTE roaming.
• Define and implement signalling rules and message manipulation logic.
• Implement fraud prevention actions.
• Work closely with vendors during software upgrades, migrations, and incident handling.
• Ensure all changes are executed in a controlled and compliant manner.
• Follow established processes for testing, validation, and documentation of new services.
• Facilitate knowledge transfer within the team and wider organisation.
• Provide support and guidance to operational teams.

What You Will Need to Succeed in This Role

• Solid understanding of Mobile Voice Core Networks IMS/CS architectures
• Proven experience in the operation and maintenance of, at least, the following Ericsson nodes:
• MSC-S, M-MGw, STP, CSCF, MTAS, SBC and BGF, HLR-FE, AuC-FE, MNP-FE, HSS-FE
• Strong understanding of 2G, 4G, and 5G mobile network architectures and the E2E call flows.
• Strong knowledge of telecom protocols including: Circuit Switched: H.248, SS7, ISUP, BICC, SIGTRAN, INAP, CAP, TCAP, MAP, SCCP, IMS (Mobile): SIP/SDP, Diameter (Cx, Sh, Rx)
• Evidence of active, hands-on Operations & Maintenance experience within the aforementioned Mobile Core environments, preferably within the Ericsson MSS, IMS and UDC family of products.
• Minimum 10+ years of proven experience in Mobile Core Networks.

Senior Engineer | Gibraltar | Telecommunications | Mobile Core | Networks | Voice core