Salary: £? - ? per year
Requirements
- SIP/VoIP call performance testing experience with SIPp, Spectra, WinSIP, and StarTrinity
- Automation experience using Python and Robot Framework
- API test automation and performance testing experience with Locust, Blazemeter/Taurus, k6, Newman, and JMeter
- GUI automation experience with TestCafe
- CI/CD test integration experience
- Basic Linux and Windows administration skills
- Expertise in operating systems such as Linux (RHEL, CentOS, OEL) and Windows Servers/Workstations, along with DNS, DHCP, LDAP, and Active Directory servers
- Experience in telecom applications such as Metaswitch Rhino, Dialogic Media Server, and Perimeta SBC, and telecom protocols such as SIP and RTP
- Good knowledge of ITIL processes and security implementation/system hardening on telecom applications and services
- SSCA SIP School Certified Associate, desirable
- Knowledge of intelligent network service protocols such as INAP, CAP, and MAP, desirable
- Experience using Metaswitch Scenario Simulator to produce test scenarios for SIP, INAP, and MAP protocols, desirable
- Experience developing scripting, e.g. Python, desirable
Responsibilities
- We design, scale, and maintain automated test frameworks for signaling, media handling, and regression suites
- We build automation scripts to simulate high volumes of concurrent calls, load stress, and network degradation
- We embed automated test scripts into continuous integration pipelines such as Jenkins, GitLab, and GitHub Actions
- We author highly detailed test cases covering functional, negative, security, boundary, and edge‑case scenarios for multi-party call flows
- We manage and structure test suites inside test management platforms such as Jira
- We ensure full traceability between business requirements, technical specifications, and executed test cases
- We capture and evaluate packet data using Wireshark and tcpdump to diagnose audio drops, call failures, or one‑way media
- We verify SIP signaling, SDP negotiations, and RTP/SRTP media stream compliance
- We 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 stakeholders
- We log clear, actionable bugs in Jira with SIP ladder diagrams, automated logs, and PCAP file captures
- We partner closely with DevOps and Network Engineers to isolate, reproduce, and resolve complex infrastructure bugs
Technologies
- API
- Active Directory
- CI/CD
- DevOps
- GitHub
- GitLab
- ITIL
- JIRA
- Jenkins
- JMeter
- LDAP
- Linux
- Network
- Python
- RHEL
- Robot Framework
- Security
- Windows
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.
last updated 36 week of 2026
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Senior QA Automation Engineer employer: Experis
As a Technical Stores Person at our Boscombe Down location, you will be part of a dedicated team supporting military operations with a focus on efficiency and high standards of service. Our company fosters a collaborative work culture that values employee growth, offering training opportunities and the chance to develop your skills in a dynamic environment. With a commitment to excellence and compliance, we provide a unique opportunity to contribute meaningfully to the defence sector while enjoying the benefits of working in a supportive and professional setting.
