5G CU/DU Software Developer - Protocol Stack (L2/L3)

As a skilled and passionate software engineer, your role will involve developing the 5G Central Unit (CU) and Distributed Unit (DU) components with a deep expertise in protocol stack development. You will be responsible for the following key tasks: - Designing, developing, integrating, and optimizing 5G CU and DU software components. - Implementing and maintaining L3 protocols, focusing on RRC and RRM. - Developing and enhancing L2 protocol layers such as MAC, RLC, and PDCP. - Collaborating with system architects and test teams to ensure standards compliance and high performance. - Analyzing call flows, debugging protocol issues, and optimizing throughput and latency. - Participating in system-level design discussions and contributing to the feature roadmap. - Conducting unit testing, regression testing, and debugging using simulation and real-time testbeds. For Central Unit (CU) Development, you should have: - Strong understanding and hands-on experience with 3GPP L3 protocols. - In-depth knowledge of RRC and RRM. - Hands-on experience on TS 38.300, TS 38.331, TS 38.401. - Experience in end-to-end UE, gNB, and Core for 5G call flow analysis, session management, mobility handling, and policy enforcement. - Good understanding of F1 interface and NGAP interface. For Distributed Unit (DU) Development, you should have: - Deep understanding of Layer 2 protocols MAC, RLC, and PDCP. - Good understanding of 3GPP specifications TS 38.321 (MAC), TS 38.322 (RLC), TS 38.323 (PDCP). - Proficiency in implementing HARQ, scheduler, retransmission handling, segmentation/reassembly, and buffer management. - Hands-on experience in real-time multi-core systems, DPDK, and high-throughput packet processing. - Good understanding of FAPI interface and hands-on experience with 5G FAPI/nFAPI Specification. Preferred Skills: - Experience with open source 5G stacks or commercial 5G stack solutions. - Familiarity with O-RAN architecture. - Strong programming skills in C/C++, multi-threading, and low-latency optimizations. - Experience with 5G test equipment and tools like QXDM, Wireshark, protocol analyzers. - Exposure to Kubernetes/Containers for deploying RAN functions in cloud-native environments. Education & Experience: - B.E./B.Tech/M.Tech in ECE, CS, or a related discipline. - 3-10 years of relevant industry experience in wireless protocol stack development. If you are interested in this opportunity, kindly reach out to info@techphosis.com.,