Stripe's Harbor: AI-assisted prototyping tool produced 12,000 prototypes since May
dl_weekly · x · 2026-09-23
Stripe's engineering blog details Harbor, an internal AI-assisted prototyping tool created by Staff Engineer Cristian Rivera on the Web Presence team.
- Harbor compiles prototypes in the browser and re-anchors comments across agent rewrites, letting teams validate ideas fast
- Since May 2026, 3,000+ Stripes have produced 12,000 prototypes with it
- The post is a full engineering writeup of how the tool works
It joins Stripe's growing set of internal AI practices, including the homegrown one-shot coding agents "Minions" that merge over 1,000 PRs per week.
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