NBIOT L2 Engineer

Mavenir Systems, Inc.; Bengaluru; On-site; INR 1,200,000 - 2,400,000; Full time

Job summary

Mavenir Systems, Inc. is seeking an experienced telecom software engineer in Bengaluru to design, implement and test embedded networking stacks for 3GPP LTE/NB-IoT. You will work on MAC/RLC/PDCP layers, UE state transitions, and signaling with S1AP/X2AP, in a Linux environment.

The role emphasizes high-performance, low-latency scheduling, protocol debugging with tools like Wireshark, and collaboration with vendor stacks to optimize NB-IoT throughput and power efficiency.

Qualifications

• Strong understanding of 3GPP LTE/NB-IoT Layer 2 and Layer 3 protocols such as MAC scheduling, HARQ, RACH, paging, and UE state handling.
• RLC modes and retransmission behavior in telecom stacks.
• PDCP sequence numbering, security, ROHC, and bearer management.
• RRC setup/reconfiguration/release and UE control procedures.
• S1AP/X2AP signaling and UE/cell context management.

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.

Skills

C/C++ development

LTE/NB-IoT 3GPP protocols

Linux/Unix environments

Multithreading & IPC

S1AP/X2AP signaling

Tools

Wireshark

Job description

Mavenir is building the future of networks and pioneering advanced technology, focusing on the vision of a single, software-based automated network that runs on any cloud. As the industry's only end-to-end, cloud-native network software provider, Mavenir is transforming the way the world connects, accelerating software network transformation for 250+ Communications Service Providers in over 120 countries, which serve more than 50% of the world's subscribers.

Role Summary

Plans, 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

• Strong understanding of 3GPP LTE/NB-IoT Layer 2 and Layer 3 protocols: MAC scheduling, HARQ, RACH, paging, logical channels, and UE state handling
• RLC modes and retransmission behavior
• PDCP sequence numbering, security, ROHC, and bearer management
• RRC setup/reconfiguration/release and UE control procedures
• S1AP/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 environments
• multithreading and shared-memory design
• timers, state machines, and protocol packet processing
• debugging packet traces and protocol logs
• Understanding of LTE/NB-IoT bearer concepts: SRB/DRB
• logical channels and transport channels
• UE context, cell context, and RB reconfiguration
• connection 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

Accessibility

Mavenir is committed to working with and providing reasonable accommodation to individuals with physical and mental disabilities. If you require any assistance, please state in your application or contact your recruiter.

Mavenir is an Equal Employment Opportunity (EEO) employer and welcomes qualified applicants from around the world, regardless of their ethnicity, gender, religion, nationality, age, disability, or other legally protected status.

We embrace disruptive, innovative technology architectures and business models that drive service agility, flexibility, and velocity. With solutions that propel NFV evolution to achieve web-scale economics, Mavenir offers solutions to help CSPs with cost reduction, revenue generation, and revenue protection. We have strong values and are always looking for like-minded individuals to join us in the path to change the shape of our industry.

United: One Company; One team; One Unified Vision Passionate: Big thinkers with audacious ideas and solutions Honorable: Integrity, respect and commitment is in our DNA. Fearless: Courageous, bold, determined and challengers of the 'norm'.

If you have any question about your application or a communication from us, please do not hesitate to reach out to us at [phone] or email [e-mail].