Junior RAN Software Engineer, 5G NR NTN Test Terminal

Sateliot is a Barcelona-based satellite company with one goal: connect everything, everywhere. Founded in 2018, we've built the first satellite constellation that lets standard commercial devices communicate directly from space. Our technology bridges the gaps that terrestrial networks will never reach, bringing affordable and secure connectivity to industries, governments, and communities across the planet.

Learn more: https://sateliot.space/

About the team & this role

Sateliot brings standard cellular connectivity from space, and develops key parts of its radio access technology in-house, test tooling included. Non-terrestrial networks are one of the most active areas in telecoms right now, and this is a chance to work on the radio itself rather than on top of it. As Junior RAN Software Engineer you will work on our 5G NR non-terrestrial test terminal side by side with a senior engineer who reviews what you write, and you will own the test and validation pipeline around it. The role is deliberately designed as an entry path into radio access software: we are looking for someone early in their career who is fast with AI-assisted development and rigorous about understanding what they ship.

What you'll do

• Build and extend our own 5G NR NTN test terminal software, paired with our 5G stack architect as your reviewer.

• Own its test and validation pipeline: automation, continuous integration, regression runs and the analysis of what the results mean.

• Drive integration step by step — terrestrial first, then satellite GEO and LEO over a software channel emulator, then over RF with a physical emulator.

• Work AI-first: orchestrate AI-assisted development, and be able to explain and defend every line that ships.

• Grow into the domain: this position is the path to becoming a radio access software engineer, with the mentoring to get there.

What you bring

• A degree in telecommunications, electronics or computer engineering, with solid C or C++ and Python for tooling.

• Foundations in mobile radio protocols — LTE or 5G — and genuine willingness to work from the 3GPP specifications.

• Something real you have built and can walk us through — a thesis, a personal project, an internship — explaining the design decisions you took and why.

• Lab curiosity: comfortable around hardware, logs and software-defined radios, and happy to get your hands dirty.

• Practical AI skills paired with the creative problem-solving to put them to work.

Bonus if you have

• Academic or personal projects with open-source radio access software such as srsRAN or OpenAirInterface.

• Linux and embedded development, or software-defined radio projects.

• Interest in satellite communications and non-terrestrial networks.

• Version control and CI practice beyond the classroom.

Additional requirements

• This role is lab-based and hands-on with hardware, so it is on-site: you will sit with the engineers you work with, at one of our engineering locations.

• Our process includes a short practical exercise: you will solve a small problem using AI assistance and then walk us through the result and defend your choices.

How we work

We lead with humility, move fast, and take ownership. We collaborate without ego and measure ourselves by real impact, not titles or hierarchy. We hire people who already live these values.

What we offer

• Real impact on one of Europe’s most ambitious space projects.

• Growth: we cover 50% of courses or master’s degrees (up to 5% of your salary), plus Spanish and Catalan classes.

• Health & balance: 50% on private health insurance and Urban Sports Club, a flexible schedule, and hybrid work, we focus on results, not hours.

• Flexible Compensation: flexible compensation through Cobee (meal, transport, kindergarten).

• A truly global team: 20+ nationalities building something genuinely new - and genuinely nice to work with. Great vibes, real teamwork.

• A real welcome: a dedicated buddy from day one.

• Life outside work: we organize leisure and sports activities both during and outside working hours - because great teams connect beyond the screen.

• Catering: if you don't have time to cook, we partner with a catering company so a freshmeal is sorted, no need to think about it.

• Parking: on-site parking at the office, with Sateliot covering 50% of the cost - plus free bike parking if you prefer to pedal in.

Sound like you?

Apply now!

Sateliot is an Equal Opportunity Employer. Employment decisions are based on merit, qualifications, and business needs, without discrimination on the basis of any legally protected characteristic.