Nabajyoti Kalita
Redmond,WA
Summary
Dynamic and results-oriented Lead Engineer with 18+ years of expertise in telecom and client servicing, driving mission-critical deployments, and operational excellence. Proven track record in leading end-to-end application deployment, system integration, testing, and performance optimization for IMS, RCS, and 4G/5G packet core systems. Adept at orchestrating cross-functional teams, streamlining STLC processes, and implementing robust QA strategies to ensure flawless product delivery. Skilled in containerized deployments, interoperability testing, and rapid issue resolution through proactive collaboration with R&D and stakeholders. Recognized for accelerating project timelines, enhancing system reliability, and delivering superior customer experiences through strategic leadership and technical precision.
Overview
18
18
years of professional experience
Work History
Lead Engineer
Mavenir
09.2021 - Current
- Architected and documented product solutions, creating clear technical specifications to streamline implementation.
- Directed and executed application deployments in lab environments, proactively troubleshooting and applying fixes to ensure system stability.
- Validated test cases for Proof of Concept (POC) across multiple projects prior to client release, ensuring quality and compliance.
- Led lab environment setup and demonstrated expertise in network analysis and testing tools, including Wireshark, IRIS, IXIA, QXDM, ANT and Radcom.
- Led client testing initiatives with AT&T, driving regression and sanity testing to uphold quality standards and accelerate resolution timelines.
- Managed acceptance testing processes (ATP) for AT&T and T-Mobile, maintaining lab and production nodes for seamless validation and go-live readiness.
- Owned integration and upgrade projects, performing post-deployment functional testing to guarantee feature integrity and minimize downtime.
- Coordinated cross-functional delivery, aligning with Dev, QA, ST and Ops team to manage product releases, bug fixes, and change requests for timely execution.
- Diagnosed and validated complex issues in lab environments, configuring systems and verifying critical features such as high availability, upgrade, and fallback.
- Championed containerization initiatives, leading EPDG deployments for T-Mobile to enhance scalability and operational efficiency.
- Enabled customer success by delivering technical training to mobile network operators and collaborating with documentation teams for accurate updates.
- Acquired foundational knowledge in deployment and integration of 5G core components such as AMF, SMF, UPF, PCF, SCP, and UDM.
- Worked on 5G packet core projects involving POC, testing, and troubleshooting integration flows across NGAP, SCTP, N2, N3, N4, and N6 interfaces.
- Tested wireless IoT solutions enabling seamless communication between embedded systems and cloud platforms.
- Deployed and provided operational support for Virtual Security Gateway (VSeGW) projects for Rakuten and T-Mobile.
- Planned and executed acceptance testing, developing ATPs and CR plans, analyzing new feature requirements, and providing strategic input to meet customer expectations.
- Taking ownership of preparing test cases and executing those cases as a part of regression testing with clients.
Senior Member of Technical Staff-II
Mavenir
09.2012 - 08.2021
- Validated IMS call flows end-to-end (E2E) in compliance with 3GPP specifications to ensure protocol adherence and system reliability.
- Tested IMS solutions including UAG (P/I-CSCF), S-CSCF, TAS, ePDG, and performed interoperability with third-party nodes such as PCRF, DRA, HSS, ENUM, MRF.
- Delivered end-to-end customer support, managing and resolving tickets to maintain service continuity and client satisfaction.
- Managed MOPs, release notes, and upgrade activities, performing functional testing post-upgrade to ensure feature integrity.
- Maintained daily customer interactions, driving timely resolution of issues and ensuring adherence to SLA timelines.
- Conducted lab testing and troubleshooting, replicating customer issues and validating fixes prior to production deployment.
- Installed and configured MSIS at customer sites, providing full lifecycle support and resolving KPI-related issues through rigorous testing.
- Led and guided teams in integrating Mavenir SeGW Gateway with network elements including MME, HeNB, and SGW.
- Executed product installations, ran ATP with customers, and ensured system go-live within committed timelines.
- Performed advanced testing for modules such as IKEv1, IKEv2, QoS, ESP packet flow, NTP, DHCP, and High Availability using IXIA tools on VSeGW.
- Conducted comprehensive testing including CLI, unit, regression, sanity, functionality, negative, system, inter-mobility, and acceptance testing.
- Configured Airgate Messaging Platform per customer requirements, supporting multiple SMS protocols like CIMD, EMI, SMPP, HTTP, SMTP, OIS.
- Successfully executed ATP evaluations with customers for Airgate projects, ensuring compliance and readiness for production.
- Leading dedicated teams for running successful process operations with proven ability of achieving organizational targets.
Operations Engineer
OnMobile Global limited
09.2007 - 09.2012
- Perform functional and integration testing to ensure application stability and readiness for deployment.
- Execute and monitor deployment processes across environments, ensuring smooth and error-free releases.
- Collaborate with the R&D team to track, report, and resolve issues identified during testing and deployment phases.
Education
Master of Computer Application -
Sikkim Manipal University
04.2012
Bachelor of Computer Application -
PES IT College Bangalore
05.2007
Skills
Tools
- Jira
- Heat
- Itrac
- Wireshark
- IRIS
- IXIA
- QXDM
- ANT
- Radcom
Database
- SQL
- MYSQL
- Postgres
- Minio
- Cassandra
- Scylla
Technologies
- 2G
- 3G
- 4G/LTE
- 5G
Protocols
- SMPP
- SS7
- SMSC
- IPSEC
- Ikve2
- SIP
- RTP
- Diameter
- HTTP
- NGAP
- PFCP
Scripting
- Shell
Operating systems and platforms
- Windows 98/XP
- Linux
- MOne
- VNF
- MWP Linux RHEL
- KVM
- NFV
- ESXI/Vmware
- Docker
- Kubernetes
- Containers
- Azure
Timeline
Lead Engineer
Mavenir
09.2021 - Current
Senior Member of Technical Staff-II
Mavenir
09.2012 - 08.2021
Operations Engineer
OnMobile Global limited
09.2007 - 09.2012
Master of Computer Application -
Sikkim Manipal University
Bachelor of Computer Application -
PES IT College Bangalore