Senior Access Layer Engineer
Barcelona, Spain · Porto, Portugal · Athens, Greece · harwell, United KingdomPosted Jun 6, 2026
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SATCOM (Broadband and Narrowband)
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Senior Access Layer Engineer
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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 global connectivity.As the team continues to scale we are now looking for a Senior Access Layer Engineer who’ll lead the implementation and validation of the satellite air interface, translating high-level architecture into detailed designs, simulations, and working prototypes.What will you be doing?You’ll play a key role in shaping how waveform generation, MAC protocols, and link adaptation perform within demanding LEO environments by:Developing and optimising PHY and MAC layer functionality for satellite communication systemsDefining and validating random access, scheduling, timing advance, and resource allocation mechanismsDesigning algorithms to mitigate LEO-specific challenges including Doppler effects, latency, and mobility constraintsBuilding and maintaining link-level simulation environments using MATLAB, Simulink, or PythonSupporting waveform, numerology, and frame structure definition aligned to 3GPP NTN and DVB-S2X standardsDeveloping and validating link adaptation strategies including ACM and CSI-driven optimisationDefining and governing interface specifications across critical access layer subsystemsLeading rapid prototyping activities using SDR platforms and system-in-the-loop validation environmentsDesigning and executing verification scenarios for mobility, handover, BER, and throughput performanceWorking closely with architects and multidisciplinary engineering teams to bridge system design and implementationWhat You’ll bring Strong capability in wireless PHY and MAC layer design within satellite or high-performance communication systemsDeep understanding of L1/L2 protocols including...