Dhivya Rajendran
Maidenhead,UK
Summary
Technical test lead with over 12 years of experience in telecom, focusing on IMS architecture, VoLTE/VoWiFi call flows, and SIP/Diameter protocols. Successfully led large-scale testing programs, managing cross-functional teams to deliver high-quality releases in agile environments. Expertise in debugging signaling flows with Wireshark, ensuring compliance with 3GPP standards, and implementing automation strategies.
Overview
13
13
years of professional experience
Work history
Test Lead
Gamma Telecom (Hybrid MVNO)
2023.02 - 2026.04
- Leading end-to-end testing for Hybrid MVNO services including voice, data, provisioning, and eSIM lifecycle
- Defined and executed comprehensive test strategy, test plans, and estimations
- Validated IMS call flows (VoLTE/VoWiFi) using SIP signalling and Wireshark traces
- Performed deep analysis of network issues including call failures and fallback scenarios
- Managed defect lifecycle using JIRA/XRAY including triage, prioritisation, and reporting
- Led eSIM testing including bootstrap, profile download, and fallback validation
- Coordinated with vendors (Ericsson, Thales) for issue resolution and root cause analysis
- Performed API testing using Postman and backend validation
- Designed and implemented automation frameworks using Playwright
- Provided risk assessments and quality metrics to stakeholders
- Managed SIM inventory and test devices for the team
- Actively participated in Agile ceremonies including sprint planning and retrospectives
Test Lead
NTT DATA UK (O2 IMS Transformation)
2018.09 - 2023.02
- Assisted with testing across IMS core for VoLTE, VoWiFi, roaming, and eSRVCC scenarios.
- Conducted protocol analysis and troubleshooting for SIP and Diameter using Wireshark.
- Supported validation of 3GPP call flows to ensure compliance with telecom standards.
- Helped manage cross-functional teams involving voice packet core and RAN domains.
- Aided in defining and executing test strategy planning and delivery timelines.
- Participated in defect triage meetings and root cause analysis alongside vendors.
- Utilised Jira and HP ALM for test management and reporting tasks.
- Collaborated with business and development teams to define appropriate test scenarios.
- Facilitated automation of regression testing using Selenium WebDriver.
- Assisted with provisioning flows including SIM swap, MSISDN change, and MNP.
Senior Test Analyst
Infinite (Nokia)
2017.09 - 2018.07
- Assisted in deployment and testing of network analyser applications.
- Supported pre and post deployment validation activities.
- Helped manage test execution and defect tracking using HP ALM.
- Collaborated with customers to understand requirements.
Test Engineer
Plintron (Lycamobile CRM)
2013.10 - 2017.09
- Assisted in executing end-to-end MVNO testing, including CRM billing and provisioning systems.
- Designed and ran functional integration and regression test cases.
- Validated APIs using SoapUI and backend systems with SQL/Oracle.
- Managed defect lifecycle through reporting, retesting, and closure.
- Supported deployment and release validation activities.
Education
B.Tech - Information Technology
Anna University
ChennaiSkills
- IMS architecture and VoLTE
- SIP, Diameter, RTP, GTP protocol analysis
- MVNO/MNO architecture
- eSIM and IoT testing
- End-to-end telecom testing
- Wireshark and Empirix debugging
- Test strategy and risk management
- Agile and Scrum methodologies
- JIRA, Xray, HP ALM management
- Automation with Selenium and Playwright
- API testing with Postman and SoapUI
- SQL, Oracle, Linux/Unix, Git, CI/CD
Languages
English
Fluent
Tamil
Native
Accomplishments
- GammaLabs UK Engineering – Colleague of the Month Award
- Recipient of the ‘Thanksgiving’ Award
- Recipient of ‘Spot Award of the Month’
- Awarded ‘Best Team’ across the organisation for excellent team performance, on-time delivery, and bug-free releases
Timeline
Test Lead
Gamma Telecom (Hybrid MVNO)
2023.02 - 2026.04
Test Lead
NTT DATA UK (O2 IMS Transformation)
2018.09 - 2023.02
Senior Test Analyst
Infinite (Nokia)
2017.09 - 2018.07
Test Engineer
Plintron (Lycamobile CRM)
2013.10 - 2017.09
B.Tech - Information Technology
Anna University