---
title: "Kaylee Williams: Founding Engineer at Inth, c15t co-author"
description: "Founding engineer at Inth (YC P26) and co-author of c15t. Open-source compliance infrastructure: consent, data rights, and developer experience."
canonical_url: "https://www.kaylee.dev/"
last_updated: "2026-07-17T17:58:31.074Z"
---
# Kaylee Williams

## Profile

Co-author of [c15t](https://c15t.com). Founding engineer at [Inth](https://inth.com), part of YC P26. I think compliance belongs in your codebase, not bolted on top of it. I like building things that are fast, with great DX & UX.

## Current Work

- Founding Engineer at [Inth](https://inth.com)
- YC P26
- Co-author of [c15t](https://c15t.com)
- Shipping consent infrastructure for teams that care about performance and UX
- c15t snapshot (as of 2026-07-17): 1,817+ GitHub stars · 195.6k+ monthly npm downloads

## Experience

### Founding Engineer · Inth

- Feb 2025 - Present
- https://inth.com
- Consent, data rights, and policy evidence, in code.

### Full Stack Engineer · Everfund

- Jun 2023 - Nov 2024
- Donation platform helping nonprofits raise more money through better technology.

## Projects

### c15t

- Open-source consent and privacy infrastructure for developers. A consent layer you ship like the rest of your code: in your bundle, in your design system.
- https://c15t.com
- https://github.com/c15t/c15t
- Tags: TypeScript

### Leadtype

- A unified docs pipeline for humans and agents: llms.txt, markdown mirrors, and agent-readable documentation from a single source.
- https://leadtype.dev
- https://github.com/inthhq/leadtype
- Tags: TypeScript, AI Agents

### DSAR

- An open-source standard for handling DSAR (data subject access request) flows programmatically, so privacy teams can automate what is usually manual.
- https://dsar-sdk.com
- https://github.com/inthhq/dsar
- Tags: TypeScript, Privacy

### Cookiebench

- An open-source benchmark for the real performance cost of cookie banners and third-party scripts. Measure the bloat before you ship it.
- https://cookiebench.com
- https://github.com/inthhq/cookiebench
- Tags: TypeScript, Performance

### Joyful

- Generate delightful, random word combinations for project names, usernames, and unique identifiers. Customizable patterns, separators, and length, with both programmatic and CLI usage.
- https://npmx.dev/package/joyful
- https://github.com/KayleeWilliams/joyful
- Tags: TypeScript, CLI

## Appearances

### First-round judge

- Built in London with Vercel and OpenAI · Jun 12, 2026
- https://luma.com/1uv1oeuu

### Why Your Consent Banner Should Be in Your Bundle

- Next.js Conf London Watch Party 2025 · Oct 22, 2025
- https://x.com/kaylee_dev/status/1981012407771431174
- https://vercel.com/go/next-js-conference-25-london-watch-party

## Sitemap

See [the full sitemap](https://www.kaylee.dev/sitemap.md) for every page and agent resource.