About Position:

We are looking for an R&D; Engineer with strong 4G and 5G protocol expertise to join the team responsible for real-time parsing, decoding, and state tracking of mobile core network signalling. You will implement and maintain protocol plugins that process live control-plane traffic from 4G LTE and 5G NR networks, extracting structured events and session records for downstream analytics.

- Role: R&D; Engineer
- Location: Pune
- Experience: 3 to 5 Years
- Job Type: Full-Time Employment

What You'll Do:

- Design, develop, and maintain 4G control-plane protocol parsers and state machines.
- Implement and enhance support for protocols such as S1AP (eNB-MME Interface), GTP-C v1/v2, PFCP, SGsAP.
- Design, develop, and maintain 5G control-plane protocol parsers and state machines.
- Implement and support NGAP communication between NG-RAN and AMF.
- Develop protocol processing capabilities for 5G Service-Based Architecture (SBA) network functions including AMF, SMF, UDM, PCF, AUSF, NRF, NEF, CHF, NWDAF, SEPP, UDR, UDSF, BSF, NSSF, LMF, EIR, AF.
- Parse and correlate multi-message telecom procedures across 4G and 5G protocols.
- Implement cross-protocol session correlation linking signaling, session management, charging, and network events.
- Maintain protocol decoders in alignment with evolving 3GPP specifications and releases.
- Develop and execute unit tests and integration tests using PCAP-based traffic replay frameworks.
- Collaborate with packet ingestion teams for messaging interfaces and metadata contracts.
- Contribute to Docker-based packaging and Helm deployments for Kubernetes environments.
- Participate in architecture discussions, code reviews, and technical design reviews.
- Create and maintain technical documentation, protocol specifications, and implementation guidelines.




- Analyze protocol traces and troubleshoot complex signaling issues.
- Support performance optimization and scalability improvements for telecom analytics platforms.

Expertise You'll Bring:

- 3-5 years of experience in telecom software development or protocol stack development.
- Strong hands-on experience in C++ systems programming.
- Deep understanding of Object-Oriented Design and software engineering principles.
- Strong knowledge of 3GPP standards across both 4G EPC and 5G Core networks.
- Experience developing telecom protocol parsers, decoders, or signaling applications.
- Strong understanding of LTE and 5G network architecture.
- Knowledge of EPC components including MME, SGW, PGW, HSS, PCRF.
- Knowledge of 5G Core components including AMF, SMF, UDM, PCF, NRF, AUSF, NSSF.
- Experience working with signaling protocols such as S1AP, NGAP, GTP-C, PFCP, NAS, and related interfaces.
- Understanding of Service-Based Architecture (SBA) and REST-based communication among 5G network functions.
- Experience with protocol analysis, packet decoding, and message correlation.
- Knowledge of telecom call flows, session management, mobility management, and charging workflows.
- Experience working on Linux development environments.
- Strong debugging, troubleshooting, and performance optimization skills.
- Familiarity with distributed systems and messaging technologies.




- Knowledge of Docker and containerized deployments.
- Understanding of Kubernetes and cloud-native application deployment concepts.
- Experience using Git and version control systems.
- Strong analytical and problem-solving skills.
- Excellent communication and collaboration abilities.
- Experience working in Agile software development environments.

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, versatile 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."

📌 Research And Development Engineer (Pune)
🏢 Persistent
📍 Pune