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Thomas Kolstø

CTO, security leader and serial entrepreneur.

Thirty years of infrastructure, software and security: NATO, a Silicon Valley security startup, telemedicine in three countries. Still happiest making things work. These days that's usually a team.

  • coding since 1996
  • 20 yrs leading teams
  • 5 startups
  • 4 acquisitions
Thomas Kolstø
CTO / CIO · Eyr Medical

Latest writing

All posts

Eight Arms, All Billable

Clocktopus is a local macOS time tracker that suggests work sessions and asks before recording them. No screenshots, no cloud. Suggest, never surveil.

Read it, 5 min

The Ash AI Tax

I kept noticing my AI agent burned more tokens on our Ash code than on plain Phoenix. So I measured it: ~2.6x more on Claude, ~1.9x on Codex — building the exact same feature.

Read it, 8 min

Hello again, again!

Third time I have lost the server this site runs on. This time an AI rebuilt it while I made demands about font sizes. New custom theme, same Hugo.

Read it, 2 min