Jishnu Vaddella
E2E IMS/VoLTE Service Delivery Lead
Hyderabad
Summary
Currently associated with Mavenir, bringing over 10 years of extensive practical experience in the telecommunications domain. Deep technical knowledge of telecom protocols combined with practical experience in IMS architecture and component-level deployment. Skilled in architecting and integrating applications across diverse environments, starting from bare metal servers and virtualization platforms to modern multi-cloud ecosystems such as OpenStack, AWS, OpenShift, and Kubernetes, with expertise in containerization and cloud-native deployments. Leading end-to-end deployment and integration of Mavenir Applications/Network Nodes across global customer environments, driving technical design, implementation, and troubleshooting throughout the delivery lifecycle. Performing in-depth solution reviews, aligning technical specifications with customer requirements, and leading hands-on implementation and integration activities. Leading technical integration efforts, proactively addressing escalations, and delivering end-to-end solutions with a focus on stability and performance. Experienced in working across diverse teams including Solution Design, Integration, Operations, and System Testing. Proven ability to plan and deliver large-scale technical projects, fostering effective collaboration with customer and internal engineering teams.
Overview
10
10
years of professional experience
3
3
Languages
7
7
years of post-secondary education
Work History
Senior Team Lead
Mavenir Pvt Ltd
04.2020 - Current
- Key Summary: Currently leading deployment activities for assigned projects, managing team members to ensure alignment with project timelines. Actively participate in customer calls to resolve open solution points, analyze and debug deployment and integration issues, and prepare project-specific test plans and product-level low-level designs (LLDs). Responsible for creating planning documents such as CIQs, peer/node integration guides, and new site configurations for various IMS nodes. Additionally, handle updates to routing and number translations based on evolving requirements.
- Recent short-term Assignment for T-Mobile Austria (Vienna): I served as the Deployment Lead for the T-Mobile Austria (Magenta) project, representing Mavenir. My responsibilities included end-to-end coordination of deployment activities, working closely with customer teams to align solution scope, timelines, and integration strategies. I led the implementation and configuration of IMS nodes in the production environment, supported acceptance testing, and ensured smooth handover to operations. The role demanded a high level of autonomy, cross-functional collaboration, and real-time issue resolution, contributing directly to the success of the deployment phase.
- Roles & Responsibilities:
- Review HLD for project scope and synch with R&D teams for feature implementations.
- Design/review Acceptance test plan documents.
- Prepare LLDs, Call routing documents for individual products.
- Based on underlying hardware/cloud, design/plan resource utilization (Prepare VM/POD layouts, IP Planning, Define FQDN/Host naming conventions etc).
- Overseeing deployment activities - Have good working knowledge on different cloud/platforms like Kubernetes, OpenStack, VMWare, AWS.
- Prepare application configurations based on project requirements.
- Overseeing end to end integration tasks and making first call through.
- Debug/Analyze call issues faced during testing - Strong protocol knowledge of SIP, Diameter, RTP and also good at networking concepts like IP-Routing, TCP/UDP/SCTP, GRE
- Implement fixes in network - Application patches, configuration changes, network changes etc.
- Participate in production traffic induction/migration activities and support for issues faced during initial phase of migration.
- Responsible for project transition from COD (Center of Deployment) to Mavenir's global support team.
QA Engineer
Oracle India Pvt Ltd (ACME Packet SBC)
08.2019 - 04.2020
- Key Summary: Worked in the Sustenance QA team for ACME Packet SBC, where the primary responsibilities included reproducing functional and non-functional defects reported by enterprise and service provider customers. These defects were analyzed and recreated in a lab environment, followed by verification of the fixes before release deployment. Handled various customer escalations, performing in-depth issue analysis and reproduction on lab setups. Collaborated closely with the development team to create test plans for validating functional flows, beyond those documented in Jira tickets, ensuring comprehensive coverage and quality assurance.
- Roles & Responsibilities:
- Running functional/non-functional flows in lab environment on SBC to reproduce/verify Jiras.
- Writing SIPp scripts to simulate various servers/endpoints in lab environment.
- Using tools like Anvil for running load tests on SBC.
- Writing/executing test plans to validate feature enhancements that are part of fixing a defect.
Member of Technical Staff-II
Mavenir Systems
02.2019 - 08.2019
- Key Projects/Roles: System Testing (MMTEL-TAS/Voice Mail Application Server), Reliance-JIO (Onsite), T-Mobile, AT&T, Mavenir-GPS
- Key Summary: Previously worked in System Test & Operations teams at Mavenir.
- Worked in System test team focusing on MMTEL-TAS and Voice Mail Application Server. Responsibilities included designing and executing test plans and cases, analyzing logs and traces, reporting defects to R&D, and collaborating closely for resolution. Also supported on-site operations teams in configuring production nodes and assisted in creating Acceptance Test Plans (ATP).
- System Testing Roles & Responsibilities:
- Writing test plans for MMTEL-TAS/Voice Mail Application server.
- Writing test cases, executing them and finding defects for various features.
- Working with development for resolution of various bugs.
- Bringing up end-to-end test setup and resolving various setup issues.
- Working with on-site operations team to help them configure the production node, create Acceptance Test Plans (ATP) for Production setup and helping them validate features.
- Working on SIPp, Python/Perl scripts to simulate traffic in test setup.
- Validating new Software releases from R&D, before handing them over to Operations team.
Member of Technical Staff-I
Mavenir
07.2015 - 02.2018
- Projects under Operations & Integration Team
- RJIO Project Roles & Responsibilities:
- Solution designing, implementation, integration, installation and upgrades of various IMS products – IMC, TAS, ASBC and ISBC.
- Acting as interface between Customer, R&D/ST and support team.
- End to end validation of provided solution to customer (ATP).
- Issue analysis and troubleshooting in customer pre-production/production environment.
- Involved in both functional and non-functional testing.
- Interactions with customers gathering requirements.
- Also involved in managing Secure64 DNS: View based zone file preparation for all Mavenir nodes.
- Writing technical documents like Customer Information Questionnaire, IP Planning document, 3rd-Party Integration document, HLD, LLD etc.
- T-Mobile & AT&T Projects Roles & Responsibilities:
- Working on resolution of tickets raised by customers.
- Analyzing carrier networks/work-orders on IMS nodes.
- Validating configuration changes or new features in lab before rolling out the changes to production environment.
- Working on high severity tickets to resolve issues under critical time limits.
- Mavenir Global Production Support Roles & Responsibilities:
- Working on resolution of tickets raised by various global customers of Mavenir – OPTUS, Vodafone-Australia, Tele2NL etc.
- Supporting onsite/customer engineers in various maintenance activities.
- Working closely with R&D to resolve issues raised in customer environment.
- Assisting onsite engineers in writing various test plans and validating test cases.
Education
Bachelor of Technology - Electronics And Communications
Jawaharlal Nehru Technological University
Kakinada 03.2011 - 03.2015
Intermediate -
Board of Intermediate Education
Andhra Pradesh 03.2009 - 03.2011
SSC -
Board of Secondary Education
Andhra Pradesh 03.2008 - 03.2009
Skills
Skilled in working with cloud-native & containerized platforms including OpenStack, AWS, WhiteStack, Kubernetes
Personal Information
- Adaptable, friendly, and a strong believer in teamwork. Always eager to learn new technologies and quick to adapt to evolving environments. Committed to excelling in assigned tasks and looking forward to engaging in challenging and impactful assignments.
- Current Location: Hyderabad
- Home Location: Hyderabad
- Date of Birth: 1993-10-22
Timeline
Senior Team Lead
Mavenir Pvt Ltd
04.2020 - Current
QA Engineer
Oracle India Pvt Ltd (ACME Packet SBC)
08.2019 - 04.2020
Member of Technical Staff-II
Mavenir Systems
02.2019 - 08.2019
Member of Technical Staff-I
Mavenir
07.2015 - 02.2018
Bachelor of Technology - Electronics And Communications
Jawaharlal Nehru Technological University
03.2011 - 03.2015
Intermediate -
Board of Intermediate Education
03.2009 - 03.2011
SSC -
Board of Secondary Education
03.2008 - 03.2009