Senior Software Engineer – NR-NTN Protocols (L3 & L4 / Core Interfaces)

Senior Software Engineer – Protocol Stack

We are seeking a highly skilled Senior Software Engineer to join our Protocol Stack team, focused on the development and optimization of 5G NR-NTN upper‑layer and core interface protocol implementations. In this role you will design, implement, and validate PDCP, eGTP, Xn interface, NGAP (N2), and N2/N3 reference point software that runs on Skylo’s NTN vRAN and core integration platform, working closely with our Core Network, MNO integration, and systems teams to deliver production‑grade NTN connectivity.

What you’ll do

• Design, develop, and maintain C++ implementations of 5G NR upper‑layer and core interface protocols: PDCP, eGTP‑U/C, Xn Application Protocol (XnAP), NGAP (N2 interface), and N3 user‑plane tunnelling.
• Implement NTN‑specific PDCP adaptations: extended PDCP sequence number space, reordering timer adjustments for long propagation delay, lossless handover support, and PDCP status repo...