Low-level Radio Stack Researcher

About Invasys

Invasys specialises in providing our government customers, such as police and intelligence services, with investigation tools. We focus on in-house research & development in the area of mobile phone and satellite communication.
During the last 6 years we have grown from 25 to 70 people and aim to grow some more over the next two years. Our offices are in a newly constructed building with possibly the best view in Brno. The work environment is flexible, something which helps create a pleasant atmosphere.
Our philosophy is to give smart people freedom to solve tasks as they see most fitting.

The position in context

Invasys has a project-oriented structure and delivers both standard and customised solutions. Our engineering teams, supported by a creative and innovative team of scientists, work hard to deliver solutions the market has not yet seen. With the upcoming deployment of 5G SA we need to strenghten our Science Group.
Most of the time you will work in a Czech speaking environment but basic knowledge of English is required. The position offers good opportunities for the right person.

Tasks and responsibilities

As low-level radio stack researcher you work in a team with other researchers – mostly radio specialists, and cyber security and cryptology specialists. The work description is analysis, experimenting, and optimalisation of software radio stacks at lower layers. The work covers optimalisation of modulation/demodulation algorithms that run on software defined radios (SDRs); improving scan speeds; and identification of central frequencies in given communication bands (focused on bands reserved for 2G-5G mobile networks), and similar tasks. The work covers all technologies from 2G to 5G and experiments with utilization of software defined radios (SDRs).

Qualifications & Requirements

You can probably say “yes” to most of the following:

  • Technical university education (MSc. or Ph.D.)
  • Good knowledge of low-level radio and network communication protocols (focus on L1-L2 layers)
  • Programming skills covering areas of modulation techniques and modulation schemes
  • Programming skills covering areas of coding theory
  • Experience with optimalisations
  • Familiar with GSM/UMTS/LTE
  • Good programming skills (C/C++, Python)


Katerina Szabo

Recruitment Manager

katerina.szabo@invasys.com / +420 603 811 339