4G/5G Stack L2 Lead/ Engineer

Tips: Provide a summary of the role, what success in the position looks like, and how this role fits into the organization overall.

Responsibilities

Education: Bachelor's degree or above in Computer Science, Telecommunications, Information Engineering, Automation, or related fields.

Key Responsibilities

• Develop and debug 4G/5G L2 software using C/C++ and Python.
• Work on MAC, RLC, and PDCP layers for LTE and 5G NR.
• Design, develop, optimize, and debug MAC scheduling algorithms for LTE eNB and 5G gNB.
• Work on segmentation/reassembly, retransmission, flow control, QoS, ciphering/integrity, and packet handling.
• Understand HARQ, TDD/FDD timing, uplink scheduling, DRX, Buffer Status Reports (BSR), and Logical Channel Prioritization (LCP).
• Optimize L2 performance for latency, throughput, retransmissions, fairness, QoS, and power saving.
• Analyze system logs, L2 traces, PCAPs, timing logs, and RF test results to identify and resolve issues.
• Work with L1/L2/L3 interfaces and understand 3GPP RAN architecture.
• Support interoperability testing across different UEs, chipsets, core networks, and network vendors.
• Work with protocol decoding and ASN.1 workflows.
  
  

Tools & Technologies

C/C++, Python

LTE / 5G NR

MAC / RLC / PDCP

ASN.1 and protocol decoding

Linux debugging and performance tuning

QCAT, Viavi, IxLoad Wireless, IxNetwork

Spirent Landslide

Wireshark

PCAP and log analysis

DPDK, Hugepages, SR-IOV

FPGA/SoC, SmartNIC/DPU

x86/ARM-based server environments

Virtualized DU/CU deployments

Preferred Experience

• Strong hands-on experience in 4G/5G L2 software development.
• Experience with MAC scheduler development and optimization is highly preferred.
  
  

For senior-level profiles, experience driving 4G/5G L2 development programs and delivery is preferred.

[Be specific when describing each of the responsibilities. Use gender-neutral, inclusive language.]

Example: Determine and develop user requirements for systems in production, to ensure maximum usability

Qualifications

[Some qualifications you may want to include are Skills, Education, Experience, or Certifications.]

Example: Excellent verbal and written communication skills

Skills: c++,python,c