Michalis Vasileiadis

Security researcher. Builder.

Based in San Francisco. I find what's broken in other people's systems during the day — the rest of the time belongs to Cristal.

Michalis and Cristal on a San Francisco rooftop at night
About

A quick version

I'm a security researcher and software engineer — most recently known for hacker-bob, an MCP runtime that's turned up 17 CVEs across 9 open-source projects, and founder-os, a set of AI agent skills that run real founder jobs. Off the clock: travel, bad jokes, and Cristal.

17 confirmed CVEs9 open-source projectshacker-bob · 99 starsfounder-os · 12 agent skills
What I Do

Three things, done properly

Security research

Vulnerability discovery, exploit development, and responsible disclosure across production systems.

AI agent systems

MCP runtimes and agent tooling — hacker-bob for offense, founder-os for building companies.

Select engagements

Security audits, agent architecture, and technical advising. Details at michalisvasileiadis.work.

Elsewhere

Find me elsewhere

Work

Projects, research, and what I'm building.

Life

Travel, people, and everything off the resume.

Us

Michalis & Cristal.

Shop

The CRISTAL tee.

The Gallery

Life, lately

Michalis and Cristal in front of the Reichstag, Berlin
Berlin, in front of the Reichstag.
Michalis kneeling in front of Cristal in a dim hallway
One knee, mid-joke.
Michalis and Cristal in a sleigh at a Christmas market
Sleigh ride at the Christmas market.
Michalis and Cristal under warm string lights at night
String lights, late night.
Michalis pointing at his CRISTAL t-shirt
The CRISTAL tee.
Michalis and Cristal sharing cotton candy at a night market
Cotton candy at the night market.
Michalis and Cristal laughing, close-up
Close-up.
Michalis and Cristal in front of a blue-lit stone tower at night
A cold night by the tower.
Portrait of Michalis Vasileiadis
Hi, that's me.
Claude Code reaction, from the beanbag.