Expert hands. Zero assumptions.

Bring your hardest security challenges.

I'm Gerben. I work independently on offensive security: penetration testing, red teaming, reverse engineering and secure code review.

I came to security after building software for a long time. I want to know how a system really behaves, from the top abstraction layer down to the physical one.

Web and API, mobile, cloud, external perimeter, OT. Firmware, binaries and protocols when the interesting part is underneath. Source-level review, smart contracts included. Red teaming when the question is whether anyone would notice.

You work with me directly. The person who found the bug explains it to you.

Start here

• Work with me: engagements, and who this isn't for.
• About: the background.
• helloREMOVE@handsonzero.com, or the contact page.

Found a security issue in something of mine? The disclosure policy says how I'll handle it.