About Position:

We are seeking a highly skilled Senior 5G Network Level Test Engineer who can seamlessly bridge 3GPP standardization theory with real-world network implementation. This role demands strong expertise in E2E system testing, RAN protocols, and AI-driven automation. You will validate 5G Small Cell systems against 3GPP Rel-15/16/17 specifications, debug complex call flows, and ensure robust performance across gNB, UE, and Core Network interfaces.

Role: 5G Network Test Engineer
Location: Bangalore
Experience: 6 to 12 Years
Job Type: Full Time Employment

What You'll Do:

Validate 5G RAN Systems End-to-End:
Execute standards-driven E2E test plans on real gNB, Small Cell, and Femto Gateway hardware, ensuring full compliance with 3GPP Rel15/16/17 specifications and IETF RFCs.
Analyze & Debug Protocol Layers:
Investigate L2/L3 signaling using Wireshark, QXDM, QCAT, and XCAL/XCAP; perform ASN.1 decoding to identify deviations, failures, and bottlenecks in call flows, mobility, security, and throughput.
Own Root Cause Analysis:
Perform deepdive debugging for issues such as NG/S1 setup failures, RLC/MAC throughput degradation, handover failures, EPS Fallback issues, VoNR call drops, and SeGW tunnel establishment problems.
Drive Feature Verification:
Validate advanced 5G features including ENDC (NSA), SA Option2, CBRS (SAS/DP interactions), VoNR, Mobility Events (A3/A4/A5), and PTP (1588v2) synchronization.
Develop Test Automation:
Build and enhance automation using Python, Robot Framework, Pandas-based log analysis, and Scapy for packet manipulation. Reduce manual effort through reusable frameworks and automation workflows.
Utilize AI Tools for Engineering Efficiency:
Leverage LLMs to parse large PCAPs, extract IE values, generate regex for log mining, and summarize complex issues from regression cycles.
Manage End-to-End Lab Setup:
Configure and maintain cOAM, certificate management for Security Gateway (SeGW), and Core Network simulators (EPC/5GC). Ensure stable, scalable testbed operations.
Collaborate with CrossFunctional Teams:
Work with development, QA, system architects, and deployment teams to drive feature readiness, interoperability, and release quality.

Expertise You'll Bring:

Deep 3GPP Protocol Knowledge:
Mastery of 3GPP Rel15/16/17 specs including RRC (TS 38.331), NGAP (38.413), XnAP (38.423), and NAS (24.501), along with handson debugging using these standards.
Advanced RAN & Call Flow Expertise:
Proven experience with ENDC/SA call processing, Mobility Events (A3/A4/A5), handover algorithms, VoNR, EPS Fallback, CBRS/Domain Proxy interactions, and PTP 1588v2 synchronization.
Strong Debugging & RCA Skills:
Ability to dissect logs across L2/L3, decode ASN.1, and resolve issues involving throughput degradation, signaling failures, and IPsec/SCTP transport challenges.
Automation & Scripting Proficiency:
Solid experience with Python, Robot Framework, Pandas-based log analysis, Scapy, and Shell scripting to automate protocol-level testing and eliminate manual effort.
AIDriven Engineering Mindset:
Comfortable using AI/LLMs to analyze PCAPs, generate regex patterns, summarize failures, and build smarter debugging workflows.
Network Element & Lab Setup Knowledge:
Experience configuring gNBs, Femto Gateways, SeGW (certificates/IPsec), cOAM systems, and EPC/5GC simulators with full ownership of lab environments.
Tools Expertise:
Handson experience with Wireshark (advanced filters/Lua), QXDM, QCAT, XCAP/XCAL, and other protocol trace tools.
SelfDriven, StandardsFirst Approach:
Ability to start from 3GPP documentation, challenge assumptions, and drive feature validation with strong analytical and problemsolving skills.

Benefits:

Competitive salary and benefits package
Culture focused on talent development with quarterly growth opportunities and company-sponsored higher education and certifications
Opportunity to work with cutting-edge technologies
Employee engagement initiatives such as project parties, flexible work hours, and Long Service awards
Annual health check-ups
Insurance coverage: group term life, personal accident, and Mediclaim hospitalization for self, spouse, two children, and parents

Values-Driven, People-Centric & Inclusive Work Environment:

Persistent is dedicated to fostering diversity and inclusion in the workplace. We invite applications from all qualified individuals, including those with disabilities, and regardless of gender or gender preference. We welcome diverse candidates from all backgrounds.

We support hybrid work and flexible hours to fit diverse lifestyles.
Our office is accessibility-friendly, with ergonomic setups and assistive technologies to support employees with physical disabilities.
If you are a person with disabilities and have specific requirements, please inform us during the application process or at any time during your employment

Let's unleash your full potential at Persistent - persistent.com/careers

Persistent is an Equal Opportunity Employer and prohibits discrimination and harassment of any kind.

5G Network Test Engineer