Aim high, go beyond

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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:

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- Developing and optimising PHY and MAC layer functionality for satellite communication systems




- Defining and validating random access, scheduling, timing advance, and resource allocation mechanisms
- Designing algorithms to mitigate LEO-specific challenges including Doppler effects, latency, and mobility constraints
- Building and maintaining link-level simulation environments using MATLAB, Simulink, or Python
- Supporting waveform, numerology, and frame structure definition aligned to 3GPP NTN and DVB-S2X standards
- Developing and validating link adaptation strategies including ACM and CSI-driven optimisation
- Defining and governing interface specifications across critical access layer subsystems
- Leading rapid prototyping activities using SDR platforms and system-in-the-loop validation environments
- Designing and executing verification scenarios for mobility, handover, BER, and throughput performance
- Working closely with architects and multidisciplinary engineering teams to bridge

📌 Senior Access Layer Engineer (Barcelona)
🏢 PassFort
📍 Barcelona