London‑based Meticulous, founded by brothers Gabriel Spencer‑Harper and Quentin Spencer‑Harper, raised $15m in Series A led by Ethan Kurzweil of Chemistry and backed by Menlo Ventures and a host of angels, including former Stripe operator Lachy Groom, Dropbox co‑founder Arash Ferdowsi, and others.

AI agents write code faster than reviews can catch, so developers are slowed by long cycles and bugs. Meticulous analyzes a codebase and its intended use to produce a checklist of edge cases. It simulates user flows before and after a change, giving developers a thumbnail report of impacted screens.

The tool currently tests frontend only but plans to move to full stack. It has already grown annual recurring revenue five times in a year, serving Notion, Eleven Labs, Dropbox, Wiz, and Launch Darkly.

With the round, the founders will spend on marketing, R&D for backend testing, and hiring. The 20‑strong team aims to reach 30–40 in 12 months, hiring forward‑deployed engineers to embed with customers and solve bespoke problems.