Back Office IMS Core Engineer

3 days ago

Bucharest, Bucureşti, Romania Connect44 Full time 30,000 - 60,000 per year

Position OverviewWr are looking for a Back Office IMS Core Engineer to join our team in Bucharest.

Job location: Romania, Bucharest

Available Positions: 1 position

Job type: Permanent

Job Ref. Number: BOIMSCE

Description
Main activities and tasks:

  • Provide second-line operational support for the Core network, ensuring high availability, stability, and service quality.
  • Manage the lifecycle of Core-related Incidents, Problems, and Changes, coordinating with vendors, field engineers, and stakeholders.
  • Perform configuration, integration, and maintenance of Core nodes across legacy and cloud-native platforms.
  • Monitor performance KPIs, signalling flows, and service quality metrics, proactively detecting degradations and implementing corrective actions.
  • Participate in Change Management, planning and executing software upgrades, capacity expansions, parameter changes, and feature activations in line with approved Methods of Procedure (MoPs).
  • Conduct acceptance testing and validation for new Core nodes, releases, and services before production rollout.
  • Provide remote technical support for Core-related implementation or troubleshooting activities, including interworking with RAN, IP transport, and Data Centre teams.
  • Support Problem Management by performing root cause analysis (RCA) of recurring service issues and recommending permanent fixes.
  • Deliver reports and documentation on incidents, performance trends, and network changes, contributing to the operational knowledge base.
  • Participate in public event assurance by monitoring Core traffic and subscriber sessions during peak or special events.
  • Cover 24x7 on-call duties, acting as technical authority for Core-related escalations.

Required Experience

  • Hands-on operational experience with Core network elements.
  • Familiarity with NFVI / Cloud Native platforms and Core virtualisation.
  • Strong background in Incident, Problem, and Change Management in telecom Core networks.
  • Knowledge of interworking between RAN, IP/MPLS, and Core.
  • Experience in Managed Services or NOC environments is desirable.

Specific Skills & Technical Knowledge

  • Good understanding of IMS architecture and signalling, including CSCF (I/S/E), SBC, ENUM/DNS, BGCF, and MMTel/MTAS functions.
  • Knowledge of SIP, Diameter, RTP and their role in voice, video, and messaging over IP services.
  • Familiarity with VoLTE, VoWiFi, and Rich Communication Services (RCS).
  • Awareness of SBC interworking, security, and policy enforcement for interconnect and roaming.
  • Understanding of number portability (CCS-NP), voice emergency (CCS-SNA), and aggregation proxy (AFG) functions.
  • Familiarity with Ericsson IMS platforms or similar systems from other vendors (e.g., Oracle SBC).
  • Knowledge of regulatory compliance systems, including LI IMS (Lawful Intercept) integration and troubleshooting.
  • Ability to analyse IMS traces, SIP call flows, and performance KPIs for service quality assurance.

What We Offer

  • Growth Opportunities – Support for learning and career advancement.
  • Work-Life Balance – Flexible hours and hybrid work options.
  • Inclusive Culture – A welcoming, diverse environment where everyone feels valued.
  • Generous Time Off

Apply Now

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