# Cassidy Williams

> Cassidy Williams is a Chicago-based software engineer, Senior Director of Developer Advocacy at GitHub, and one of the most recognizable voices in the frontend developer community. Known online as @cassidoo, she runs the widely-read weekly newsletter 'rendezvous with cassidoo,' builds mechanical keyboards, mentors early-career engineers, and has spoken everywhere from TED stages to the United Nations. She's a Glamour '35 Women Under 35 Changing the Tech Industry' honoree, a LinkedIn Top Professional, and a firm believer that you get a lot by giving.

- **Role:** Senior Director of Developer Advocacy at GitHub
- **Organizations:** GitHub, Contenda (former CTO), React Training (former), Netlify (former), Remote (former), CodePen (former), Amazon (former), Clarifai (former), Venmo (former), L4 Digital (former), Theatre.js (advisor), cKeys (non-profit), Hacker Fund (former Director of Outreach)
- **From:** Downers Grove, Illinois, USA
- **Nationality:** American
- **Education:** B.S. Computer Science, Iowa State University
- **Known for:** Glamour '35 Women Under 35 Who Are Changing the Tech Industry', LinkedIn Top Professionals 35 & Under, HuffPost '5 Inspiring Young Women Leading The Way In STEM'

## Career timeline

- **2011** — Internship at Microsoft during university
- **2012** — Internship at Intuit during university
- **~2013** — President of the Computer Science/Software Engineering club at Iowa State - first woman to hold the role
- **2014** — Selected by NCWIT to represent students at the White House Tech Inclusion Summit
- **2015** — Presented to the United Nations on a project empowering women in STEM
- **2015** — Graduated Iowa State; joined New York startup as software engineer and developer evangelist
- **~2016** — Developer Evangelist at Venmo
- **~2017** — Lead Developer Evangelist at Clarifai
- **~2018** — Developer Voice Programs Lead at Amazon
- **~2019** — Senior Software Engineer at CodePen (8th employee)
- **~2020** — Director of Developer Experience at Netlify
- **~2021** — Head of Developer Experience at Remote
- **~2022** — CTO at Contenda (AI content platform startup)
- **~2023** — Joined GitHub as Senior Director of Developer Advocacy
- **2025** — Wrote about AI pushing developers toward typed languages; TypeScript surpasses all others on GitHub
- **2026** — Spoke at Codemotion Madrid, Deep Dish Swift Chicago, TechCamp Korea Seoul

## Achievements

- Glamour '35 Women Under 35 Who Are Changing the Tech Industry'
- LinkedIn Top Professionals 35 & Under
- HuffPost '5 Inspiring Young Women Leading The Way In STEM'
- Presented to the United Nations as an Iowa State University senior
- Selected by NCWIT for White House Tech Inclusion Summit
- Won a hackathon conducted mid-flight on a San Francisco-to-London plane
- Grew newsletter 'rendezvous with cassidoo' to 15,000+ subscribers
- Designed an officially licensed Scrabble mechanical keyboard set with Clackeys Inc.
- Created Twitch series 'C+C Hacking Factory' with sister Cami building Alexa skills
- Authored Udemy courses on JavaScript and React
- Speaker at Grace Hopper Celebration for Women in Computing, TEDx, United Nations, Figma Config, Codemotion Madrid
- First woman president of ISU Computer Science/Software Engineering club
- Co-runs Lady Storm Hackathons

## Latest updates

- **2026-04** — Spoke at Deep Dish Swift conference in Chicago and TechCamp Korea 2026 in Seoul
- **2026-03** — Published 'A history of styling choices leading to native CSS' on her blog
- **2026-01** — Published article on GitHub Blog: 'Why AI is pushing developers toward typed languages' - noting TypeScript is now #1 on GitHub
- **2026-01** — Spoke at Haverford College and Bryn Mawr College about tech careers and AI
- **2025-02** — Spoke with RedMonk about 'companionable coding' and GitHub Copilot

## Links

- Website: https://cassidoo.co
- LinkedIn: https://linkedin.com/in/cassidoo
- Twitter/X: https://twitter.com/cassidoo
- GitHub: https://github.com/cassidoo
- YouTube: https://www.youtube.com/@cassidoo

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Profile page: https://yespress.io/cassidy-williams
Published by YesPress — https://yespress.io
Last updated: 2026-04-22