Aim high, go beyond At Open Cosmos we are solving the world's biggest challenges from space, providing businesses, governments and researchers access to more readily available information than ever before - ready for the challenge? Then read on...The Satcom team is responsible for the design, delivery and performance of Open Cosmos' satellite communications services, spanning the space segment, ground infrastructure and general connectivity.
As our Satcom capability continues to grow, we're now looking for an Air Interface Architect to define and govern the end-to-end PHY and MAC layer architecture underpinning our LEO communication system, shaping how high-performance, scalable connectivity is delivered across the constellation.
What will you be doing?
Defining the end-to-end L1/L2 architecture for satellite communication systems aligned to 3GPP NR-NTN and DVB-S2X standardsTranslating LEO dynamics including Doppler effects, latency, beam movement, and visibility constraints into air interface requirementsDriving waveform, numerology, frame structure,



and resource allocation design for high spectral efficiency and throughputDefining coding, modulation, and link adaptation strategies across varying link and environmental conditionsArchitecting MAC layer protocols including scheduling, HARQ/ARQ, multiplexing, and resource management mechanismsDefining mobility and handover frameworks across satellites, gateways, and user terminalsSpecifying synchronisation mechanisms including timing advance and frequency pre-compensation strategiesSupporting integration between the air interface and core network functions for NTN connectivity and mobility managementLeading system-level and link-level modelling and simulation activities to validate performance and optimise design decisionsDefining modem architecture and functional partitioning across FPGA/ASIC and software layers to support multi-waveform operationContributing to future roadmap activities aligned with evolving 3GPP NTN

📌 LEO Satellite Air Interface Architect (Barcelona)
🏢 EF
📍 Barcelona