Cassidy Williams
Cassidy Williams
Hi! I’m Cassidy, and I like to make memes and dreams and software. I’m the Senior Director of Developer Advocacy at GitHub! Outside of that fancy title, I’m a startup advisor and investor, open source-er, and meme-maker on the internet. I enjoy building mechanical keyboards, playing music, hanging out with my family and friends, and teaching in my free time.
August 2026
September 2026
October 2026
Top Words
- next
- react
- making
- astro
- build
- github
- recap
- building
- html
- netlify
- apps
- text
All posts (315)
When it comes to certain projects, I like “doing things that don’t scale.”, particularly with my newsletter. I noticed that my newsletter open rate was down over the past few months to about 40-45%. Not bad, but not as good as it once was. A friend of mine suggested I ask people to respond to the email on occasion...
I stumbled upon the CSS property corner-shape recently and it’s pretty cool. It allows you to specify the shape of an element’s corners and works with border-radius. I threw together this demo to show it in action: See the Pen corner-shape beveled and rounded navbar by Cassidy (@cassidoo) on CodePen. I remember in...
I switch back and forth between Windows and Mac pretty regularly depending on what I’m working on (and sometimes between WSL and PowerShell on the same machine, what a time to be alive), and one thing that I always mess up in PowerShell on Windows is making a new file. On Linux-based machines, you can run touch...
I have been getting a lot of newsletter responses, DMs, and emails in general saying that people have discovered my work not via traditional SEO, but via LLMs and AI tools like ChatGPT, Claude, Perplexity, and even GitHub Copilot. So, I did a little experiment to try and improve my discoverability in these tools,...
I made a game called Code Wave for the recently completed GitHub Game Off 2025! I really enjoy game development, but don’t get to do it often. When I saw that the theme this year for the Game Off was WAVES, I thought that it would be fun to do something creative with it! Before I continue, if you want to play other...
My mom taught art appreciation when I was growing up, and I love looking at different artists’ works over time and remembering what I was taught as a kid, and seeing things through a different lens as an adult. My latest rabbit hole has been re-looking through the art of Mary Cassatt! I’ve always loved her painting...
In case you missed it, I have a little AI Manifesto here on this blog. I do use AI for work, and often shill AI for work, and use it often on side projects. That being said, I really care about using AI as a tool, rather than a replacement for my own thoughts and ideas. I think it’s very important to not default to...
I gave a short talk today to some students at Haverford College and Bryn Mawr College about AI, a career in tech, networking, and getting jobs in general! My friends Lilly and Johnson from FSH Tech are teaching a J-Term course at these schools to help students learn about agentic AI, production deployment, and...
Wow. 2025 is done. It’s been… a lot? A lot. It’s been a lot. Similar to my 2024 recap, I’ve got a lot to write before midnight strikes, so let’s get into it. Work things! I’m still working at GitHub! This year my team was a content machine. We revived the biweekly YouTube show, The Download, and hit millions of...
It’s been a hectic, busy month, truly so so busy, but I blogged every day for Blogvent! In case you missed it, my goal was to blog daily in December. I missed it! No you didn’t! Check out alllll the posts here: Automatically mark pull requests and issues as stale with GitHub Actions Change commit timestamps in Git...
It’s Blogvent, day 23, where I blog daily in December! This month I went to the GitHub office in San Francisco and met up with some coworkers and put together some videos for work. While working on other content, we got a lot of b-roll of me around the office just like… walking, typing, and being dumb. So, when I...
It’s Blogvent, day 22 where I blog daily in December! I write my blog posts in markdown, and I write quotes like so: > I miscounted the men! > > - Gavin Volure This results in the following: I miscounted the men! Gavin Volure It always bugged me how the HTML generated a <ul> for the quote author, because the default...
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