NBIOT L2 Engineer

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 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
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.