About this role
Salary: £? - ? per year
Requirements: SIP/VoIP call performance testing experience with SIPp, Spectra, WinSIP, and StarTrinityAutomation experience using Python and Robot FrameworkAPI test automation and performance testing experience with Locust, Blazemeter/Taurus, k6, Newman, and JMeterGUI automation experience with TestCafeCI/CD test integration experienceBasic Linux and Windows administration skillsExpertise in operating systems such as Linux (RHEL, CentOS, OEL) and Windows Servers/Workstations, along with DNS, DHCP, LDAP, and Active Directory serversExperience in telecom applications such as Metaswitch Rhino, Dialogic Media Server, and Perimeta SBC, and telecom protocols such as SIP and RTPGood knowledge of ITIL processes and security implementation/system hardening on telecom applications and servicesSSCA SIP School Certified Associate, desirableKnowledge of intelligent network service protocols such as INAP, CAP, and MAP, desirableExperience using Metaswitch Scenario Simulator to produce test scenarios for SIP, INAP, and MAP protocols, desirableExperience developing scripting, e.g. Python, desirable Responsibilities: We design, scale, and maintain automated test frameworks for signaling, media handling, and regression suitesWe build automation scripts to simulate high volumes of concurrent calls, load stress, and network degradationWe embed automated test scripts into continuous integration pipelines such as Jenkins, GitLab, and GitHub ActionsWe author highly detailed test cases covering functional, negative, security, boundary, and edge-case scenarios for multi-party call flowsWe manage and structure test suites inside test management platforms such as JiraWe ensure full traceability between business requirements, technical specifications, and executed test casesWe capture and evaluate packet data using Wireshark and tcpdump to diagnose audio drops, call failures, or one-way mediaWe verify SIP signaling, SDP negotiations, and RTP/SRTP media stream complianceWe continuously monitor and log critical VoIP KPIs including jitter, packet loss, latency, and Mean Opinion Score (MOS)We generate comprehensive test execution summaries, metric dashboards, and formal test closure reports for stakeholdersWe log clear, actionable bugs in Jira with SIP ladder diagrams, automated logs, and PCAP file capturesWe partner closely with DevOps and Network Engineers to isolate, reproduce, and resolve complex infrastructure bugs Technologies: APIActive DirectoryCI/CDDevOpsGitHubGitLabITILJIRAJenkinsJMeterLDAPLinuxNetworkPythonRHELRobot FrameworkSecurityWindows More:
We are seeking a highly skilled VoIP Services Tester with Automation Experience to join our engineering team on a 6-month hybrid assignment inside IR35, umbrella only. In this role, we ensure the reliability, quality, and security of our real-time voice and video communication systems across our global telecom infrastructure. We focus on exceptional voice quality and system stability, with opportunities to work closely with engineering, DevOps, and network teams. If we receive suspicious outreach claiming to be from us, please contact us via the ManpowerGroup website.
last updated 35 week of 2026