IMS Core Expert

We are seeking a highly skilled IMS Core Network Expert to join our dynamic team at GSD MS Managed Performance Services. This role is critical in ensuring the performance, optimization, and reliability of Nokia CS/IMS Core network infrastructure. The ideal candidate will bring deep technical expertise in IMS protocols, call flows, and 3GPP standards, along with hands-on experience in performance analysis, troubleshooting, and network optimization. You will collaborate with cross-functional teams to drive innovative solutions, resolve customer issues, and enhance network KPIs to meet industry benchmarks.

How You Will Contribute And What You Will Learn

• Nokia IMS Core Network Optimization: KPI calculation, Capacity forecasting, and network audits. Identify performance bottlenecks and resolve incidents.
• IMS Call Flow & Protocol Analysis: Troubleshoot Registration, SIP call setup/teardown, RTP/RTCP, EPSFB, and Interworking. Analyze SIP error codes and cause codes.
• Network Operations & Customer Support: Interface with customers, perform end-to-end tracing and call flow analysis, and provide technical resolutions.
• Network Architecture & Optimization: Design, deploy, and maintain CS/IMS Core elements. Collaborate on network enhancements and capacity planning.
• Automation & Tooling: Utilize Power BI, NetAct/OSS, and Cloud platforms for monitoring.
• Documentation & Reporting: Prepare reports, lead CS/IMS Core performance meetings, and define database/network parameters.

Key Skills And Experience

• Bachelor of Engineering in Electronics/Electrical/Communication/Computer Science
• Minimum 12+ years of domain experience
• Strong knowledge of Nokia IMS Core and CS Core KPIs.
• Solid working experience in latest Nokia Products – CNCS IMS, SDM/SDL, UDM & AUSF
• Vast experience on optimization & troubleshooting of Nokia IMS & CS Core nodes
• Sound Knowledge on IMS parameters & timers, policies and their impact on network performance
• Expertise in IMS protocols (SIP, SDP, Diameter, RTP/RTCP) and 3GPP signalling.
• Hands-on experience with Wireshark tracing, any Network Probing tools (RADCOM, NETSCOUT, Polystar, etc.) - Perform e2e tracing and call flow analysis, collect logs and analyze and come with actionable insights.
• Experience in End-to-End Roaming KPI monitoring.
• Deep understanding of HLD, LLD, MOP Validation and IMS Core network planning.
• Strong analytical & troubleshooting skills
• Ability to work in shifts to support global customer projects.
• Proficient in English, MS Office & PowerBI
• Skilled in any of Kubernetes, Docker, AWS services, Scripting, and/or Python programming is added advantage.

About Us Advancing connectivity to secure a brighter world. Nokia is a global leader in connectivity for the AI era. With expertise across fixed, mobile and transport networks, powered by the innovation of Nokia Bell Labs, we’re advancing connectivity to secure a brighter world.

Learn more about life at Nokia .

Our recruitment process We act inclusively and respect the uniqueness of people. Our employment decisions are made regardless of race, color, national or ethnic origin, religion, gender, sexual orientation, gender identity or expression, age, marital status, disability, protected veteran status or other characteristics protected by law. We are committed to a culture of inclusion built upon our core value of respect.

If you’re interested in this role but don’t meet every listed requirement, we still encourage you to apply. Unique backgrounds, perspectives, and experiences enrich our teams, and you may be just the right candidate for this or another opportunity.

The length of the recruitment process may vary depending on the specific role's requirements. We strive to ensure a smooth and inclusive experience for all candidates. Discover more about the recruitment process at Nokia .

About The Team Some of our benefits in Romania :

• Flexible working arrangements to support work–life balance
• A minimum of 90 days of Maternity and Paternity Leave, with the option to return to work within a year following the birth or adoption of a child (based on eligibility)
• Medical insurance plan and annual reimbursements for dental, eyeglasses, or lenses
• Sports, wellness, and culture reimbursements, including monthly support for activities, kindergarten, and after-school expenses
• Ticket Restaurant e-card and transportation allowance for daily convenience
• Generous referral bonus for referring qualified candidates
• 24+ paid vacation days and three annual bonuses (Performance, Christmas, and Easter)
• Well-being programs to support your mental and physical health
• Opportunities to engage with Nokia Employee Resource Groups (NERGs), as well as access to mentors, coaches, and Employee Growth Solutions
• A learning culture that promotes continuous personal and professional growth – for your role and beyond