The XYZ formula
Google's hiring guidance: write bullets as "Accomplished [X], as measured by [Y], by doing [Z]." Start with a strong verb, name a concrete result with a number, and say how you did it. Every example below follows it; swap in your own metrics.
Performance (Core Web Vitals)
- Improved LCP from 4.2s to 1.8s and INP from 350ms to 120ms via code-splitting and deferring third-party scripts.
- Raised Lighthouse performance score from 45 to 96 through image optimization, caching, and critical-CSS extraction.
- Reduced JS bundle size 45% with tree-shaking and a Webpack-to-Vite migration, cutting time-to-interactive ~2s.
Accessibility
- Remediated the UI to WCAG 2.1 AA, resolving 150+ axe/Lighthouse violations ahead of an ADA compliance audit.
- Introduced keyboard and screen-reader testing to the QA process, catching issues automated tools missed.
- Built accessible, ARIA-correct components adopted as the team's default, reducing a11y regressions 60%.
Design systems & scale
- Built a design system of 80+ reusable, accessible components adopted by 5 product teams, cutting UI dev time 35%.
- Shipped and maintained UI serving 500K+ monthly active users at 99.9% uptime.
- Led migration of a legacy Angular.js app to React + TypeScript across 30 views with zero regression incidents.
Product impact & quality
- Drove a 14% lift in conversion after a Core Web Vitals remediation project.
- Increased component test coverage from 40% to 90% (Vitest + React Testing Library), cutting post-release bugs 75%.
- Cut PR review turnaround ~50% by authoring component documentation in Storybook.