Big Four Security logoBig Four Security
Careers

Build the future of OT and device intelligence with us.

Big Four Security is a small, senior team working on hard problems across OT security, signal intelligence and device heritage. We are continuously looking for new talent to join us.

No open positions — yet

We are not actively hiring right now.

We do not have any open roles at the moment, but we plan to start hiring soon. We encourage you to check this page from time to time and to follow our LinkedIn company page — that is where new openings will be announced first.

If you are passionate about OT/ICS security, signal intelligence, firmware, hardware analysis, supply-chain risk or building serious infrastructure software, we would still love to hear from you.

Follow us on LinkedIn Introduce yourself

What to expect

  • Senior, low-ego team
    Small group of operators, engineers and researchers who ship.
  • Real-world impact
    Work that protects critical infrastructure and industrial sites.
  • Remote-friendly
    Distributed team across EU and partner regions.
  • Hard, interesting problems
    OT, RF, firmware, supply chain — no two weeks look alike.
Prefer to talk first? Get in touch with the team.