Building a Design System Linter for Figma: Architecture, Algorithms, and Lessons from Development
A technical walkthrough of UiUX Report: a pure-function rule engine, WCAG contrast resolution, perceptual colour clustering, a pluggable design-system abstraction, and an SSRF-hardened Playwright backend, built by a designer who wrote the specs while an AI coding agent wrote the code.
This is the technical companion to my first article, which covers the "why" and the product story. Here I go under the hood: the architecture, the algorithms, the decisions I got wrong first, and how the system was actually built.
1. The problem, restated as an engineering problem
Design system compliance review is a manual diff between two datasets: the set of values used in a screen (fills, type styles, spacing, radii, component instances) and the set of values permitted by the design system. Humans perform this diff by eye, layer by layer, and then communicate the result through comments and tickets.
Most of that diff is mechanical...
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