Stack 4G/5G 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: Bachelors degree or above in Computer Science, Telecommunications, Information Engineering, Automation, or related fields.

Key Responsibilities:

1. Develop and debug 4G/5G L2 software using C/C++ and Python.
2. Work on MAC, RLC, and PDCP layers for LTE and 5G NR.
3. Design, develop, optimize, and debug MAC scheduling algorithms for LTE eNB and 5G gNB.
4. Work on segmentation/reassembly, retransmission, flow control, QoS, ciphering/integrity, and packet handling.
5. Understand HARQ, TDD/FDD timing, uplink scheduling, DRX, Buffer Status Reports (BSR), and Logical Channel Prioritization (LCP).
6. Optimize L2 performance for latency, throughput, retransmissions, fairness, QoS, and power saving.
7. Analyze system logs, L2 traces, PCAPs, timing logs, and RF test results to identify and resolve issues.
8. Work with L1/L2/L3 interfaces and understand 3GPP RAN architecture.
9. Support interoperability testing across different UEs, chipsets, core networks, and network vendors.
10. 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:

1. Strong hands-on experience in 4G/5G L2 software development.
2. 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