We knew it was impossible. We did it anyway.

We rebuild the OS not for the thrill - but out of necessity.

At Gapfruit, we rethink the very foundation of operating systems.

Our team unites pioneers in OS design, cybersecurity, and hardware. 
Guided by world-class advisors and a bold vision, we’re building what others thought impossible — the next generation of operating systems for the electronics industry.

Portrait Christian Kielmann
Christian Kielmann
CEO and Co-Founder

The upward trajectory of Christian's career unfolded during his five-year tenure as a project manager leading a formidable team of 25. Furthermore, he…

Portrait Sid Hussmann
Sid Hussmann
CTO and Co-Founder

Sid is a technologist with broad systems knowledge across various domains and a deep understanding
in building secure products. He is also an entrepr…

Roman Iten
Co-Founder and Senior Software Engineer

Roman is a software guru skilled in designing CI/CD systems, embedded software, the Genode OS Framework, C++, GitLab and Linux. He has over …

Pirmin Duss
Co-Founder and Senior OS Engineer

Pirmin has a background in electrical engineering and more than 25 years’ experience in embedded
software development and systems engineering …

Stefan Thoni
Co-Founder and Head of Security

Stefan is a virtuoso in cryptography, network security, security protocols, and the intricate landscape of security concepts and management. His time at …

Gapfruit OS isn’t just software –
 It’s the result of a decade-long obsession

All began with painful truths no one wanted 
to face. However, like a beautiful pearl forming around a grain of sand, Gapfruit grew not from hype but pressure, clarity, and time.

Born from Swiss precision and shaped by real-world failure, it combines uncompromising security and unprecedented scalability.
We planted a holistic security at the core and built everything else around it. 
The result? A secure, resilient, future-proof OS for the infrastructures that matter most.

how we ended up doing the impossible

Where it started.

Before Gapfruit, our founders built
a military-grade OS for Swiss security authorities.

gapfruit is born.

Instead of repackaging old ideas, we started from scratch. The goal is to build an OS that brings those same principles to the industry.

The prove in financial services.

Together with Securosys, Gapfruit powered a TrustedExecution Environment (TEE) in hardware security modules (HSM) for interbank clearing and compliance.

we made a hard choice.

We shifted focus from financial services to critical infrastructure to provide edge gateway board support packages (BSP) solutions. That meant industrial IoT, LoRaWAN, and gateways that defend the edge, not just connect it.

we delivered real value.

In a live industrial PoC, Gapfruit OS demonstrated what traditional systems can't: zero-touch provisioning from OS to application, including configuration and data as well as  self-healing driver resilience, and downtime-free updates.

in operation. for real.

Gapfruit OS is now running in production gateways in the industry, where security and resilience aren't optional, and updates are possible throughout a gateway's lifetime.