Six Fathoms — software & tools
Software & tools,
built in deep water.
Six Fathoms is where I build, ship, and maintain software and tools — the projects I work on outside the day job, collected in one place. No clients, no decks, no sales calls. Just things I think are worth putting my name on.
I'm Theo Zourzouvillys. By day I work full-time on the architecture and implementation of complex distributed systems in identity, security, and anti-fraud. The rest of the time I live aboard a sailboat in the remote waters of British Columbia and Alaska, and keep a steady pile of side projects going. Six Fathoms is where they live.
I grew up building things the hard way: hosting platforms, ISPs, low-level VoIP stacks, peer-to-peer networks, databases, and Linux kernel modules — bare metal, carrying servers into datacenters. The platforms changed; what I care about didn't. Software that holds up under real load, that you can read, and that keeps working when no one is watching.
Soundings — what I keep coming back to
- 03 Marine & boat software — charting, AIS, NMEA, and tooling for life off-grid on the water.
- 05 Security — signing, auth, and protocols that fail closed, not open.
- 08 Big data — moving and crunching a lot of it without melting the budget.
- 11 Distributed systems — the unglamorous plumbing that has to be correct.
- 14 High-performance SaaS — the patterns that keep services fast as they scale.
Have a look at what I'm building. Found a bug? Open an issue.