IMS Component Test Engineer (m/f/d)

Join to apply for the IMS Component Test Engineer (m/f/d) role at ng-voice .

Overview

Design, execute, and optimize isolated testing of individual IMS network components such as P‑CSCF, S‑CSCF, I‑CSCF, and IMS Application Servers. Focus on protocol‑level validation, load behavior, and resource efficiency using SIPp‑based SIP emulation and Diameter emulators within Kubernetes containerised environments.

Key Responsibilities

• Perform individual component‑level testing of IMS elements in isolation and provide actionable insights to improve IMS robustness, scalability, and efficiency.
• Analyze and troubleshoot SIP, Diameter, and mixed‑protocol call flows.
• Design and maintain SIPp XML scenario files for IMS signalling use cases and create CSV input files for large subscriber sets.
• Execute bulk‑load, CPS, and long‑duration endurance tests, model real‑world traffic from Wireshark captures, and capture, inspect, and analyze pcaps for SIP signalling validation.
• Monitor IMS component performance using Grafana dashboards, analyze CPU, memory, network, and socket utilisation, maximise traffic capacity, and correlate protocol‑level behaviour with resource consumption.
• Identify bottlenecks, leaks, or inefficiencies during prolonged runs.

Requirements

• Understanding of 3GPP IMS call flows, timers, retransmissions, failure scenarios, and familiarity with ENUM / DNS / NAPTR in IMS routing.
• Exposure to Kamailio / OpenSIPS and basic Kubernetes troubleshooting with awareness of container limits affecting SIP/Diameter performance.

Benefits

• Work‑life balance with flexible hybrid remote culture and hybrid home office budget.
• Diverse team representation and flat hierarchies.
• Fast‑growing start‑up culture with maturity of an enterprise company.
• Mobility, fitness, language class, wellness benefits for full‑time employees.

Equal Opportunity Employer

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

Even if you do not meet 100% of the requirements, however, if 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.