Role SummaryPlans, designs, develops and tests software systems or applications for software enhancements and new products including cloud-based or internet-related tools.
May use common development methodologies such as Waterfall and Agile.

Key Responsibilities

- Design, implement, and debug Layer 2/3 control and data path features
- Maintain MAC scheduler behavior for UL/DL grant decisions and resource allocation
- Work on RLC and PDCP flows for segmentation, retransmission, reordering, and bearer management
- Implement and validate UE/CELL state transitions driven by RRC and S1AP/X2AP messages
- Troubleshoot protocol interoperability and real-world failure scenarios
- Optimize scheduler and bearer behavior for NB-IoT constraints such as coverage, latency, and power efficiency

Job Requirements

Must-have skills

- Solid understanding of 3GPP LTE/NB-IoT Layer 2 and Layer 3 protocols:MAC scheduling, HARQ, RACH, paging, logical channels, and UE state handlingRLC modes and retransmission behaviorPDCP sequence numbering, security, ROHC, and bearer managementRRC setup/reconfiguration/release and UE control proceduresS1AP/X2AP signaling and UE/cell context management




- Hands-on experience in C/C++ development for telecom or embedded networking stacks
- Familiarity with low-latency, real-time scheduling and event-driven protocol processing
- Experience with: Linux/Unix environmentsmultithreading and shared-memory designtimers, state machines, and protocol packet processingdebugging packet traces and protocol logs
- Understanding of LTE/NB-IoT bearer concepts:SRB/DRBlogical channels and transport channelsUE context, cell context, and RB reconfigurationconnection establishment, mobility, and release procedures

Preferred experience

- Experience with NB-IoT or LTE eNodeB stack development
- Knowledge of 3GPP specs: MAC, RLC, PDCP, RRC, S1AP, X2AP
- Familiarity with ASN.1 / protocol encoders/decoders
- Experience with security/encryption functions used in PDCP
- Exposure to scheduler optimization, throughput/latency tuning, and interference handling
- Ability to work with vendor stacks and trace tools such as Wireshark, logs, and internal UE/eNB diagnostics

📌 NBIOTEngineer (India)
🏢 Mavenir
📍 India