Katherine Williams

Owned features end to end on a multi-tenant AI product, in React and TypeScript.

• Owned features end to end on a multi-tenant AI product: complex task schedulers, token usage visualizations, and the React/TypeScript surfaces customers used most, plus the UX and product decisions behind them.
• Built the output surface for an AI tool generating sales slidedecks through multiple models, so people could verify and rework whatever the model wrote, then present it live.
• Built and maintained the shared React component patterns the team relied on to ship consistent UI quickly.
• Worked directly with the founders to turn customer insight into product decisions and shipped features, closing the loop between feedback and release.
• Integrated frontend applications with CRM APIs (Salesforce, HubSpot).

Owned the front end of a consumer endurance-running tool in Vue and TypeScript.

• Owned the front end on a small team, building responsive consumer-facing interfaces for an endurance-running tool in Vue and TypeScript.
• Translated Figma layouts into pixel-accurate interfaces, and picked up Vue on the job while shipping from week one.
• Implemented shared Storybook components for buttons and typography to keep the UI consistent.

Full-stack work on a real-time audience platform used live at Fortune 100 events.

• Worked full stack on a real-time audience platform used live in front of Fortune 100 audiences: React and TypeScript in front, Laravel and Redis behind it, with WebSocket interaction that stayed fast under load.
• Validated API payloads at runtime with io-ts, so a bad response failed at the boundary instead of somewhere deep in the UI.
• Built an in-app configuration suite for customizing presentations, making complex authoring feel simple for non-technical users.
• Owned the unit testing for its color palette configuration, where the combinations multiply fast and a regression shows up on stage.
• Partnered with product and design to turn Figma into responsive, pixel-accurate, reusable Material UI components, keeping the interface consistent as the product grew.

Built web applications for research teams in an agency-style delivery model.

• Built web applications across many languages in an agency-style delivery model.

Race-planning app, live with real users: React, Express, MongoDB, Clerk auth, Stripe payments.

• Race-planning app for the ultrarunning community: React 18, TypeScript, Vite, with a custom design token system over Chakra UI, bespoke color scales, an RP-prefixed reusable component library, and self-hosted variable typography.
• Interactive UI craft: Mapbox GL race map with custom markers, drag-and-drop crew planner (dnd-kit), Framer Motion animation, and a cache-first TanStack Query data layer.
• Production-grade: Clerk auth, Stripe payments, Express and MongoDB backend, Sentry monitoring; tested with Vitest, Testing Library and Playwright; deployed on AWS Amplify and Railway.