L2 Developer - Telecom/Wireless/5G/4G/LTE

Idexcel; Bengaluru; On-site; INR 1,200,000 - 2,400,000; Full time

Job summary

Idexcel is hiring an L2 Developer in Bengaluru (Manyata) with 2–8 years of telecom experience. You will work on 4G/5G L2 layers, including MAC/RLC, PDCP, and related interfaces, using C++ and Python for design, debugging, and performance improvements.

The role requires expertise in MAC scheduling, L2 protocols, and 3GPP specifications, with familiarity in tools like QCAT, Viavi, IxLoad, IxNetwork, Spirent Landslide, and Wireshark. Preferred knowledge of Google Test Framework.

Qualifications

• BE/B.Tech degree required in relevant field.
• 2–8 years of experience in telecom domain (4G/5G).
• Mandatory: RAN, L2 Layer, MAC/RLC, C++, 3GPP specifications.
• Preferred: Google Test Framework (GTF).

Responsibilities

• Systems engineering, design, coding, and debugging for 4G/5G L2 (FDD/TDD) features.
• Mentor high-performance L1 teams on PDCP/RLC/MAC across platforms.
• Lead large-scale 4G/5G L2 product development and customer support.
• Communicate effectively with senior internal and external stakeholders.

Skills

RAN

L2 Layer

MAC/RLC

C++

3GPP Specifications

Google Test Framework

Education

BE/B.Tech

Tools

QCAT

Viavi

IxLoad Wireless

IxNetwork

Spirent Landslide

Wireshark

Job description

Role & responsibilities

Position/Title- L2 Developer

Overall exp- 2-8 Years

Any domain specification- TELECOM / WIRELESS /5G/4G/LTE

Qualification Criteria- BE/ B tech

Mandatory Skills- RAN, L2 Layer, MAC/RLC, C++, 3GPP Specifications

Preferred Skills: Google Test Framework (GTF)

Work location- Bengaluru (Manyata)

Details JD-

Skillset & Expertise Level

• 3-8yrs of relevant experience
• Expertise on MAC scheduling algorithms for eNB (LTE), gNB (5G), including their design, development, optimization, and debugging.
• Proficiency in MAC, RLC, PDCP for design and implementation for LTE and NR, including segmentation/reassembly, retransmission, flow control, packet splitting/ duplication, ciphering/integrity interaction points, , QoS.
• Understanding of L2 implications of TDD vs FDD timing for duplex-driven HARQ and scheduler timing, uplink grant strategies, DRX interactions, buffer status behavior, logical channel prioritization.
• Experience in optimization for latency, retransmission efficiency, throughput, fairness, DRX/power-saving behavior, QoS flow to radio bearer mapping
• Grasp of L2 interfaces with L1 (Physical Layer) and L3, 3GPP RAN split architectural options
• Programming: C/C++/ Python Programming Language, memory pooling, Programming & Debugging state machine design, error handling, traceability, and robust interoperability engineering across different UE/chipset/core/network-vendor combinations, ASN.1/protocol decode workflows
• Log Analysis: Proficiency in analyzing system logs to diagnose issues.
• Specialized Tools: Expertise in using tools like QCAT (UE logs) Viavi (network testing and measurement equipment) plus IxLoad Wireless, IxNetwork, Spirent Landslide, Wireshark.
• Understanding of FPGA/SoC-based radio acceleration, SmartNIC/DPU-assisted data paths, DPDK/hugepages/SR-IOV, Linux performance tuning for virtualized DU/CU implementations, x86/ARM servers deployment, diagnosis of KPI loss using L2 traces, PCAPs, timing logs, and RF test outputs using protocol decodes, and traffic emulators L2 software development experience
• Additional years of driving delivery of 4G/5G L2 programs

Roles & Responsibilities

• Systems Engineering, design, architecture, coding, debugging and implementation, feature scalability from a broader system-level perspective for 4G/5G L2 - FDD and TDD
• Review and Mentor high performance L1 teams towards delivery excellence in the following PDCP/RLC/MAC layer development on various platforms and integrations with L1 and L3, OAM etc for high performance basestations
• Ability to drive large scale 4G/5G L2 product development, sustenance and customer support programs involving multiple variants of eNodeBs/gNodeBs in various forms including vRAN/ORAN/custom
• Ability to communicate with senior levels of internal and external stakeholders