Senior Telecommunications Systems Engineer

World Aquatics; Toulouse; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

UNIVITY is seeking a Senior Telecommunications Systems Engineer to join our Toulouse team. You will dimension, define and validate advanced communications systems, reporting to the CTO.

The role covers end-to-end architecture across user, space, ground segments and 5G core, including roaming and RAN sharing. You will drive budgets, perform simulations in Python or MATLAB, and ensure readiness for Releases 17–20 and 6G.

Qualifications

• Engineering degree or master’s in telecommunications, electronics, or space systems.
• PhD is a plus.
• Experience in satellite telecommunications systems is highly valued.

Responsibilities

• Define and evolve end-to-end architecture: user, space, ground segments, 5G core, roaming.
• Make strategic decisions on allocation of onboard/ground functions and frequency planning.
• Consider subsystem capabilities and limitations in designs.
• Prepare for and defend system reviews.
• Specify and monitor interfaces (ICD): Uu NR-NTN, NG, F1, feeder links, inter-satellite links.
• Manage NTN-specific effects: Doppler, delay, timing, mobility, feeder handover.
• Determine number of satellites and access stations; establish end-to-end budgets (link budgets, throughput, latency).
• Develop system simulation models; evaluate service performance and deployment costs; coordinate with operators.
• Ensure compliance with Releases 17–19 and prepare for Release 20 and 6G.
• Contribute to standardization (3GPP RAN/SA, ETSI) with partners.
• Support end-to-end integration/validation: test benches, satellites emulators, interoperability with terminals and 5G cores.
• Support end-to-end anomaly analysis and resolution across teams.

Skills

Systems engineering

Satellite communications

End-to-end architecture

Budgeting & link budgets

Python or MATLAB

English fluency

Education

Engineering degree

Master's degree in telecommunications or space systems

PhD a plus

Tools

Capella

SysML

OpenAirInterface

srsRAN

Amarisoft

Job description

UNIVITY is looking for a Senior Telecommunications Systems Engineer to join the team in our Toulouse office.

As Senior Telecommunications Systems Engineer, you will be responsible for dimensioning, defining and validating the advanced communications system. This role reports directly to the CTO.

Your key responsibilities and tasks:

• System architecture
  • Define and evolve the end-to-end architecture: user segment, space segment (on-board gNB, CU/DU partitioning), ground segment (gateways, TT&C), 5G core, and operator interconnection (roaming, RAN sharing).
  • Make key strategic decisions: allocation of on-board/ground functions, frequency plan, coverage and handover strategy in very low Earth orbit.
  • Take into account the capabilities and limitations of the various subsystems to be implemented.
  • Prepare for and defend system reviews.
  • Specify and monitor interfaces (ICD): Uu NR-NTN, NG (N2/N3), F1, feeder links, inter-satellite links, monitoring, and orchestration.
  • Manage NTN-specific effects: Doppler shift, propagation delay, timing advance, mobility due to satellite movement, and feeder link handover.
• Performance and Budgets
  • Determining the number of satellites to be launched into orbit, as well as the number of access stations to be deployed.
  • Establishing and maintaining end-to-end budgets: link budgets, throughput, capacity, latency, availability, synchronization, and QoS.
  • Developing system simulation models that support these budgets.
  • Evaluate service performance and capabilities based on the deployment strategies being analysed, particularly in the scenarios defined in collaboration with partner operators
  • Take into account deployment and operational costs to validate compatibility with the business plan
  • Monitor compliance with Releases 17 through 19 (NR-NTN) and prepare for Release 20 and 6G.
  • Contribute to the standardization strategy (3GPP RAN and SA, ETSI) in collaboration with partners.
• Support for verification and validation activities
  • Support for defining the end-to-end integration and validation strategy: test benches with satellite channel emulators, interoperability with commercial terminals and 5G cores, and in-orbit demonstration campaigns.
  • Support for end-to-end anomaly analysis and coordinating their resolution across teams.

Profile required

Skills and experience

• Education and Experience
  • Engineering degree or master’s degree in telecommunications, electronics, or space systems; a Ph.D. is a plus.
  • At least 10 years of experience in telecommunications systems engineering, including significant experience in the design of satellite telecommunications systems
• Essential Skills
  • Systems engineering methods: requirements, interfaces, budgets, milestone reviews adapted to new space environment
  • Knowledge on state-of-the-art satcom technologies
  • Link budgets and propagation models.
  • Simulation and analysis using Python or MATLAB.
  • Fluency in business English, both written and spoken.
• Qualifications That Will Make a Difference
  • Experience with a mobile operator, a 5G equipment manufacturer, or a space industry company.
  • MBSE system modelling (Capella, SysML) and orbital analysis tools.
  • Participation in 3GPP working groups (RAN1, RAN2, RAN3, or SA2).
  • Knowledge of spectrum regulations (ITU, ANFR, CEPT).
  • 5G NR and 5GC architecture: NG-RAN, gNB CU/DU, AMF/SMF/UPF, RRC, NAS, PDCP, RLC, and MAC protocol stacks.
  • Experience with a 5G software stack (Open Air Interface, srsRAN, Amarisoft) or an open source 5G core.
  • NTN-specific features: Doppler, delay, timing advance, HARQ, ephemeris broadcast to terminals, satellite mobility.
  • Interest in the New Space startup ecosystem.

Company description

UNIVITY is a thriving company at the intersection of space and telecommunications. We are building a neutral space wholesale infrastructure that enables telecom operators to extend their networks and deliver high-performance connectivity everywhere on Earth.
Our work focuses on advanced satellite and 5G technologies, designed to integrate seamlessly with terrestrial networks. Through ambitious demonstrator programs and real-world testing, we are laying the foundations for the next generation of space-based connectivity.
At UNIVITY, people are at the heart of the project. We value passion and excellence to honor our commitments, be sustainable, and make a true difference. Our teams work closely across disciplines, learn from one another, and are encouraged to take initiative and contribute meaningfully to the company's progress.
Joining UNIVITY means taking part in a collective adventure: building innovative technology, tackling complex challenges, and growing alongside a committed and supportive team.