Nokia

Makes network gear for carriers and data centers

IMS Core Network Expert

Telecommunications EngineeringConfirmed live in the last 24 hours

Full-timeRomaniaNo salary listedIn-person

About the Job

Requirements

A Bachelor of Engineering in Electronics, Electrical, Communication, or Computer Science is required.
A minimum of 12 years of domain experience is required.
Strong knowledge of Nokia IMS Core and CS Core key performance indicators is required.
Working experience with current Nokia products, including CNCS IMS, SDM/SDL, UDM, and AUSF, is required.
Extensive experience optimizing and troubleshooting Nokia IMS and CS Core nodes is required.
Knowledge of IMS parameters, timers, policies, and their effects on network performance is required.
Expertise in IMS protocols (SIP, SDP, Diameter, RTP/RTCP) and 3GPP signaling is required.
Hands-on experience with Wireshark tracing and network probing tools such as RADCOM, NETSCOUT, or Polystar is required, including end-to-end tracing, call-flow analysis, log collection and analysis, and producing actionable insights.
Experience monitoring end-to-end roaming key performance indicators is required.
A deep understanding of high-level design, low-level design, method of procedure validation, and IMS Core network planning is required.
The ability to work shifts supporting global customer projects is required.
Proficiency in English, Microsoft Office, and Power BI is required.

Responsibilities

Optimize Nokia IMS Core networks through key performance indicator calculation, capacity forecasting, and network audits; identify performance bottlenecks and resolve incidents.
Troubleshoot IMS registration, SIP call setup and teardown, RTP/RTCP, EPS fallback, and interworking; analyze SIP error codes and cause codes.
Interface with customers, perform end-to-end tracing and call-flow analysis, and provide technical resolutions.
Design, deploy, and maintain CS/IMS Core elements; collaborate on network enhancements and capacity planning.
Use Power BI, NetAct/OSS, and cloud platforms for monitoring.
Prepare reports, lead CS/IMS Core performance meetings, and define database and network parameters.

Desired Qualifications

Experience with Kubernetes, Docker, AWS services, scripting, and/or Python programming is an added advantage.

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.

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.

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.

About the Company

Nokia

Makes network gear for carriers and data centers

Nokia makes the equipment and software that mobile carriers, cloud companies, and businesses use to run networks, from cell-tower radios to fiber links between AI data centers. From 1998 to 2011 it was the world's largest mobile phone maker; it sold that business to Microsoft in 2014, and HMD Global, a separate company, makes Nokia-branded phones under license. Its network unit sells optical systems that send data over fiber, internet routers, and broadband gear, and its mobile unit sells radios and the core software that runs 5G networks. Nokia earns money from equipment and service contracts and from licensing its patents to phone makers and carmakers. It was founded in 1865 as a wood pulp mill and is based in Espoo, Finland.

Company size: 10,001+
Company stage: IPO
Headquarters: Espoo, Finland
Founded: 1865

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