IMS Component Test Engineer (mfd)

Role Overview

We are looking for an IMS Component Test Engineer to design execute and optimize isolated testing of individual IMS network components such as P-CSCF S-CSCF I-CSCF and IMS Application Servers .

The role focuses on protocol-level validation load behavior and resource efficiency using SIPp-based SIP emulation and Diameter emulators to simulate dependent IMS interactors. All IMS components are containerised and deployed on Kubernetes .

The engineer will work closely with platform core network and performance teams to ensure each IMS component behaves correctly efficiently and predictably under both functional and stress conditions.

Key Responsibilities

IMS Protocol & Call Flow Testing

• Perform individual component-level testing of IMS elements in isolation
• Provide actionable insights to improve IMS robustness, scalability and efficiency
• Analyze and troubleshoot SIP, Diameter and mixed-protocol call flows

SIPp-Based Emulation & Load Testing

• Design and maintain SIPp XML scenario files for IMS signaling use cases
• Correlation between multiple SIPp scripts to keep traffic realistic for the system under test
• Create input CSV files and dynamic data injection for large subscriber sets
• Emulate IMS interactors using SIPp (UEs proxies application servers)
• Execute bulk-load CPS and long-duration endurance tests
• Model real world traffic on individual IMS components from Wireshark captures
• Capture inspect and analyze pcaps for SIP signaling validation

Observability & Resource Analysis

• Monitor IMS component performance using Grafana dashboards
• Analyze CPU memory network and socket utilization
• Max traffic capacity
• Latency under load
• Correlate protocol-level behavior with resource consumption
• Identify bottlenecks leaks or inefficiencies during prolonged runs

Valuable Skills

• Understanding of 3GPP IMS call flows
• Knowledge of timers retransmissions and failure scenarios
• Familiarity with ENUM / DNS / NAPTR in IMS routing
• Exposure to Kamailio / OpenSIPS
• Basic Kubernetes troubleshooting
• Awareness of how container limits affect SIP / Diameter performance
• Kubernetes & Platform Awareness
• IMS & Telecom-Specific

Benefits

• Work-Life-Balance is a priority : Flexible working that suits you - we live and breathe a hybrid remote culture and dont mind where and when you work
• We are committed to building a diverse team that represents a variety of backgrounds perspectives and skills in a traditionally not very diverse industry
• We offer you the culture of a fast-growing start-up with the maturity of an enterprise company
• We are more interested in your experience and knowledge than formal degrees
• Entrepreneurial culture and flat hierarchies
• Mobility benefit fitness benefit language class benefit and wellness benefit (for full-time employees)
• Home office budget (for full-time employees)

Equal Opportunity Employer

ng-voice is an equal opportunity employer. We believe demographic characteristics and diverse experiences that have nurtured unique viewpoints benefit our growth and performance and value each person and their different background as a whole.

Hope we caught yourattention;we look forward to getting to know you!

DISCLAIMER

Even if you do not meet 100% of the requirements however you think this role will be a good match for you please send in your application. We would love to be in touch!

Please be aware that we are currently not collaborating with agencies and any profile received will not be taken into consideration.