Senior IMS Core Engineer

Connect44 Sarl; Reading; Hybrid; GBP 70,000 - 95,000; Full time

Job summary

Connect44 Sarl in United Kingdom is seeking a Senior IMS Core Engineer to support delivery, migration, and operational assurance of large-scale IMS Core and VoLTE environments. The role requires hands-on technical expertise and the ability to lead complex network activities, troubleshoot critical service issues, and coordinate across engineering, operations, customers and vendors.

Strong communication and technical leadership are essential to drive successful migrations, maintain high

Qualifications

• Extensive hands-on experience with IMS Core and VoLTE technologies.
• Experience with IMS migrations, deployments, upgrades and production support.
• Strong knowledge of SIP, Diameter, SBC, HSS/HLR and IMS call flows.

Responsibilities

• Lead IMS Core and VoLTE migrations, deployments, upgrades, and network changes
• Provide technical leadership across IMS, SBC, HSS/HLR
• Support VoLTE roaming implementation and service assurance
• Perform advanced troubleshooting and root cause analysis using SIP, SDP, RTP and Diameter signaling
• Lead resolution of critical incidents and technical escalations
• Ensure service continuity, high availability, and operational readiness during network changes
• Support feature verification, interoperability testing, and pre/post-deployment validation
• Review implementation procedures, rollback plans, and technical documentation
• Coordinate activities across internal teams, customers, and technology vendors
• Identify opportunities for service improvement, process optimization, and automation

Skills

IMS Core & VoLTE

SIP

Diameter signaling

HSS/HLR

SBC

Troubleshooting

Incident management

Network migrations

Leadership

Job description

We are looking for a determined and team-oriented person to join our team as a Senior IMS Core Engineer

Overall Purpose:

We are looking for an experienced Senior IMS Core Engineer to support the delivery, migration, and operational assurance of large-scale IMS Core and VoLTE environments.

The role requires strong hands-on technical expertise, combined with the ability to lead complex network activities, troubleshoot critical service issues, and coordinate across engineering, operations, customer, and vendor teams.

Key Accountabilities:

• Lead and support IMS Core and VoLTE migrations, deployments, upgrades, and network changes
• Provide technical leadership across IMS, SBC, HSS/HLR and related Core Network functions
• Support VoLTE and VoLTE roaming implementation and service assurance
• Perform advanced troubleshooting and root cause analysis using SIP, SDP, RTP and Diameter signaling
• Lead resolution of critical incidents and technical escalations
• Ensure service continuity, high availability, and operational readiness during network changes
• Support feature verification, interoperability testing, and pre/post-deployment validation
• Review implementation procedures, rollback plans, and technical documentation
• Coordinate activities across internal teams, customers, and technology vendors
• Identify opportunities for service improvement, process optimization, and automation

Required Experience

• Strong hands-on experience with IMS Core and VoLTE technologies
• Experience with IMS migrations, deployments, upgrades, and production support
• Strong knowledge of SIP, Diameter, SBC, HSS/HLR and IMS call flows
• Proven troubleshooting, incident management, and root cause analysis skills
• Experience working in large-scale, highly available telecom environments
• Experience with major IMS vendors such as Huawei, Nokia, Ericsson, Mavenir, or equivalent

Strong communication, technical leadership, and stakeholder management skills