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Conan McNicholl

12+ years building scalable web apps, AI‑powered products, and developer tooling.

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Flagship Project

This site is built with Fragments
Fragments - AI-native design system and React component library

fragments

Founder / Solo Engineer

usefragments.com

A design system and React component library with 60+ accessible components built on Base UI headless primitives. Every component ships with a co-located .fragment.tsx metadata file that serves as the single source of truth for both humans and AI agents. 9 MCP tools let AI assistants query real component contracts instead of guessing from training data.

9 MCP Tools

AI agents query component contracts, discover patterns, enforce tokens, and run WCAG checks

Seed-Based Theming

4 config values generate ~200 CSS custom properties with automatic light & dark mode support

Zero-Config Discovery

Babel AST parsing finds and documents components automatically

60+ Components

React design system built on Base UI headless primitives with WCAG compliance

Experience

  • Architected a monorepo with Next.js 15 portal app and 63+ component Storybook-driven library, deployed via Cloudflare Workers
  • Led development end-to-end: analysis, feature definitions, task breakdowns, test plans, acceptance criteria, and estimations
  • Implemented OIDC-based authentication, contract testing against OpenAPI specs, and visual regression testing
  • Mentored junior developers, led interviews, and documented coding standards across the organisation

Technology

Curated from 60+ technologies used across 12 years

Frontend

Backend

AI & Tooling