(233) 821-7453 ◇ Boston, MA
sofia@marchetti.dev ◇ linkedin.com/in/sofia-marchetti ◇ github.com/sofia-marchetti
Frontend Developer with 6+ years building accessible, high-performance web applications across e-commerce and SaaS. Cut Largest Contentful Paint by 62% through code splitting and image optimization, lifting conversion by 18%. Focuses on measurable outcomes — Core Web Vitals, accessibility scores, and user engagement — over framework name-dropping.
Coursework: Interaction Design, Accessibility.
Coursework: Web Systems, HCI, Algorithms.
- Rebuilt the checkout flow in Next.js with server components, cutting Largest Contentful Paint by 62% and lifting conversion by 18%.
- Established a shared design system in Storybook adopted by 5 product teams, reducing duplicate UI code by 40%.
- Led a team of 6 to migrate a legacy jQuery app to React, shipping incrementally with zero downtime over 9 months.
- Brought the platform to WCAG 2.2 AA compliance, raising the accessibility audit score from 61 to 98 and opening 3 enterprise contracts.
- Reduced JavaScript bundle size by 480KB through route-level code splitting and tree shaking, cutting time-to-interactive by 45%.
- Built a component library consumed by 12 internal apps, cutting new-feature build time from 3 weeks to 5 days.
- Shipped responsive marketing sites for 20+ clients, all scoring above 95 on Lighthouse performance.
- Introduced Playwright end-to-end tests, catching 90% of regressions before release and cutting hotfixes by half.
- Converted static mockups into reusable React components, reducing designer-to-developer handoff time by 60%.
Design System Toolkit. Open-source React component library with 40+ accessible primitives, full keyboard support, and dark mode. Used by 5 internal teams and 1.2K weekly downloads on npm.
Performance Audit Dashboard. Next.js dashboard tracking Core Web Vitals across 30 production sites with automated Lighthouse runs, surfacing regressions before they reached users.
Offline-First Notes App. Progressive web app using IndexedDB and service workers with conflict-free sync, working fully offline and syncing in under 200ms on reconnect.
- Write a frontend blog on rendering performance and accessibility, read by 12K+ developers per month.
- Contribute to an open-source component library and a CSS-in-JS tool.
- Volunteer as an accessibility reviewer for two nonprofit web projects.
- Mentor 4 junior developers through weekly code reviews; 2 promoted to mid-level.
- Author the internal frontend style guide, now standard onboarding material.
- Led the design-system guild of 10 engineers across 5 product teams.

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