Softpath Technologies - Layer 3 Developer - 5G/Telecom Protocols

Description : Layer-3 Developer (5G NR)

Experience : 3-5 Years

Location : Bangalore

Domain : Telecom / 5G / Wireless / L3 Protocol Stack

Mode : Work From Office

Key Responsibilities :

5G NR Layer-3 Protocol Development :

- Design, develop, implement, and optimize Layer-3 (L3) modules including RRC, PDCP, and SDAP.

- Work on control plane procedures (RRC connection setup, reconfiguration, release, measurement, etc.).

- Implement mobility management (handover, cell reselection), security, QoS, and session management functions.

5G CU/DU Architecture :

- Work on CU-CP, CU-UP, and DU components within gNB architecture.

- Integrate and optimize L3 modules in CU/DU split environment.

- Ensure alignment with 3GPP Release standards and interoperability requirements.

O-RAN Interface Development :

- Work with O-RAN F1 (F1-C / F1-U) and E1 interfaces.

- Participate in integration and validation of O-RAN compliant CU/DU components.

- Support interoperability testing with multi-vendor O-RAN implementations.

Software Development & Optimization :

- Develop high-performance, scalable, and efficient code in C/C++ on Linux environment.

- Work on multi-threaded programming, inter-process communication, and low-latency processing.

- Participate in code reviews, performance optimization, and debugging.

Standards, Compliance & Documentation :

- Interpret and implement features based on 3GPP specifications (38.xxx series).

- Contribute to design documents, architecture diagrams, configuration guides, and release notes.

- Ensure code quality, documentation, and best engineering practices are followed.

Debugging, Testing & Integration :

- Debug issues at Layer-3 and interface with Layer-2/Layer-1 teams.

- Work closely with system integration teams to validate features in lab and field environments.

- Support protocol testing, logging analysis, KPI monitoring, and trace analysis (RRC, PDCP logs).

Required Skills & Experience :

- 3 to 5 years of experience in 5G NR / 4G / 3G wireless protocol stack development.

- Strong understanding of 5G NR architecture, especially CU/DU split.

- Hands-on experience with L3 protocols :

a. RRC (Radio Resource Control)

b. PDCP (Packet Data Convergence Protocol)

c. SDAP (Service Data Adaptation Protocol)

- Strong programming skills in C/C++, Linux environment, multi-threaded programming.

- Proficiency in O-RAN interfaces : F1-C/F1-U, E1.

- Knowledge of QoS, SON, mobility management, and data/session handling.

- Strong understanding of 3GPP 5G NR specifications (Release 15/16/17).

- Experience with debugging tools, log analysis, and protocol analyzers.

Preferred Qualifications :

- Experience with 4G LTE L3 protocols (RRC/PDCP) is an added advantage.

- Exposure to Wireshark, QXDM, UERANSIM, or similar protocol testing tools.

- Experience working in Agile development environments.

- Exposure to O-RAN specifications and open-source RAN projects.