Cassidy Williams

Cassidy Williams

Personal

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.

https://cassidoo.co/

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Latest posts

• Making art with CSS gradients and corner-shape and skew, oh my 2026-03-05 04:00pm
• How passkeys work 2026-02-20 04:00pm
• I am making videos again! 2026-02-18 04:00pm
• Improving my newsletter's open rate the hard(er) way 2026-01-31 04:00pm
• Making interesting borders with CSS corner-shape 2026-01-27 04:00pm
• Remaking the Linux "touch" command in PowerShell 2026-01-19 04:00pm
• A fun trick for getting discovered by LLMs and AI tools 2026-01-18 04:00pm
• Code Wave Build Log 2026-01-17 04:00pm
• Appreciating Mary Cassatt now that I am a mom 2026-01-16 04:00pm
• Do not give up your brain 2026-01-15 04:00pm
• A career chat with students in the age of AI 2026-01-09 04:00pm
• Toodles, 2025 2025-12-30 04:00pm
• Wrapping up Blogvent 2025 2025-12-23 04:00pm
• Making the "End of Year Developer" nature documentary 2025-12-22 04:00pm
• CSS for markdown blockquote attribution 2025-12-21 04:00pm
• I like when apps are "finished" 2025-12-20 04:00pm
• I have become more of a writing utensil snob 2025-12-19 04:00pm
• Configure your repositories with .github 2025-12-18 04:00pm
• My inbox is so full 2025-12-17 04:00pm
• Things I would study more if I had time 2025-12-16 04:00pm
• Coming up with blog topics 2025-12-15 04:00pm
• Influencing without authority 2025-12-14 04:00pm
• Trying out Ente for media backup 2025-12-13 04:00pm
• Vibe coding is boring 2025-12-12 04:00pm
• Podcasts I'm listening to in 2025 2025-12-11 04:00pm
• The Abilene Paradox 2025-12-10 04:00pm
• Food I recommend in Chicago in 2025 2025-12-09 04:00pm
• Pausing a CSS animation with getAnimations() 2025-12-08 04:00pm
• Sewing an e-reader case 2025-12-07 04:00pm
• The ABCD framework for feedback 2025-12-06 04:00pm
• Lasagna and a root beer float 2025-12-05 04:00pm
• Goodbye to an 11-year-old Issue 2025-12-04 04:00pm
• The what, how, and why of CSS clamp() 2025-12-03 04:00pm
• Fix your upgrades and migrations with Codemods 2025-12-02 04:00pm
• Automatically mark pull requests and issues as stale with GitHub Actions 2025-12-01 06:44pm
• Change commit timestamps in Git 2025-12-01 04:00pm
• A pretty good email scam 2025-11-29 04:00pm
• How reducers work 2025-11-22 04:00pm
• Non-determinism and ownership 2025-11-20 04:00pm
• A poem delivered by my 2.5 year old that encapsulates parenthood 2025-11-08 04:00pm
• I am back at work and it feels weird! 2025-11-05 01:25pm
• A moose playing Go in a park while drinking boba 2025-10-03 05:00pm
• Using Notebook Navigator and Cupertino in Obsidian 2025-09-26 05:00pm
• 2000 Poops 2025-09-20 05:00pm
• Questions to ask when you think you need to finish something 2025-09-17 05:00pm
• Playing with Fliiip Book 2025-09-15 05:00pm
• I made a tree visualizer 2025-09-13 05:00pm
• This is probably the most I will ever pretend 2025-08-29 05:00pm
• Ductts Build Log 2025-08-20 05:00pm
• Making a customizable wooden phone for my toddler 2025-08-03 05:00pm
• Making a faded text effect in (mostly) CSS 2025-07-28 05:00pm
• That Windy City Keeb Meet 2025 recap 2025-07-26 05:00pm
• Have GitHub Copilot see your diff (and other cool tricks) 2025-07-21 05:00pm
• Using personal instructions in GitHub Copilot Chat 2025-07-17 11:47am
• Tools using tools 2025-07-12 05:00pm
• I (don't?) want to say yes to everything 2025-06-24 05:00pm
• Generating open graph images in Astro 2025-06-11 05:00pm
• Making Puppeteer work at build time on Netlify 2025-06-10 05:00pm
• Building for a physical scavenger hunt with Astro, Tally, and Netlify 2025-06-08 05:00pm
• Baby sayings 2025-06-06 05:00pm
• PocketCal Build Log 2025-06-01 05:00pm
• What does it mean to flatten an array? 2025-05-31 05:00pm
• Styling the icon for HTML date and time types 2025-05-20 05:00pm
• My second c-section experience 2025-05-06 05:00pm
• End of an era with Stack Overflow 2025-04-13 05:00pm
• Keybindings I use in VS Code 2025-04-12 05:00pm
• Make your images in markdown on GitHub adjust for Dark Mode and Light Mode 2025-04-09 09:24pm
• Things I learned while upgrading my iPad 2025-04-06 05:00pm
• I don't know what MCP is and at this point I'm too afraid to ask 2025-04-04 09:37am
• Geek mama... saying no... part 2 2025-03-29 05:00pm
• Create an HTML dialog when you click an image 2025-03-21 01:13pm
• I am going to have a second baby and my brain is spinning 2025-03-15 05:00pm
• We should have more friction in our lives 2025-03-14 05:00pm
• Think less, ship more 2025-02-26 12:19pm
• Debugging my Micro Journal 2025-02-15 04:00pm
• Convert a video from dark mode to light mode with FFmpeg! 2025-02-12 04:00pm
• Re-ordering Git commits 2025-01-31 04:00pm
• A couple CSS tricks for HTML Dialog elements 2025-01-08 04:00pm
• Making my startup come back to life 2025-01-08 12:29pm
• How to use GitHub Copilot Edits 2025-01-05 04:00pm
• Adios, 2024 2024-12-30 04:00pm
• The beautiful sentence that is the web 2024-12-29 04:00pm
• Wrapping up Blogvent 2024 2024-12-23 04:00pm
• I really love entering raffles 2024-12-22 04:00pm
• How I use Obsidian Dataview 2024-12-21 04:00pm
• How I use Obsidian Templater 2024-12-20 04:00pm
• It would be cool for 2024 to just calm down 2024-12-19 04:00pm
• Browser extensions I shipped in 2024 2024-12-18 04:00pm
• How I approach humor 2024-12-17 04:00pm
• I have become a minor writing utensil snob 2024-12-16 04:00pm
• Introduce yourself to your remote team 2024-12-15 04:00pm
• How to make your RSS feed pretty 2024-12-14 04:00pm
• How to switch to Astro Content Collections 2024-12-13 04:00pm
• Updating my blog to use Astro Collections 2024-12-12 04:00pm
• Choose kindness over pile-ons 2024-12-11 04:00pm
• The developer relations pendulum swings again 2024-12-10 04:00pm
• Noticing the little things 2024-12-09 04:00pm
• Actively learning languages 2024-12-08 04:00pm
• Tracking side project income 2024-12-07 04:00pm
• Doing things that don't scale is about finding value 2024-12-06 04:00pm
• 33 of my own joke concepts that have never seen the light of day 2024-12-05 04:00pm
• Ship it anyway 2024-12-04 04:00pm
• Writing good words for tech folks 2024-12-03 04:00pm
• Combining tools for fun and profit 2024-12-02 04:00pm
• The what and the what now: note-taking 2024-12-01 04:00pm
• Fighting open source spam with interaction limits 2024-11-30 04:00pm
• Being forced to upgrade 2024-11-29 04:00pm
• Haunted by my own projects 2024-11-25 04:00pm
• Two months at GitHub 2024-11-09 04:00pm
• I fell asleep in a driverless car 2024-11-05 02:10pm
• A note on the future of Jumblie 2024-10-01 09:00am
• Sleep is the most magical thing in the world 2024-09-26 02:53pm
• A Quick Guide for Building your own GitHub Copilot Extension 2024-09-17 10:00pm
• Side quests 2024-09-06 05:00pm
• Time containers 2024-09-03 09:18am
• Voice lessons taught me that I should be... true to myself 2024-08-29 10:47am
• Making a simple React microphone component 2024-08-26 02:36pm
• Why JavaScript variables don't always update 2024-08-19 09:16am
• Layering CSS gradients 2024-08-13 05:00pm
• Traveling to technical events: A guide 2024-08-10 05:00pm
• Analog girly 2024-08-08 05:00pm
• Building the Micro Journal 2024-07-27 05:00pm
• Getting paid is weird and sometimes hard 2024-07-25 10:21am
• Actually try on your job applications 2024-07-06 05:00pm
• The Productivity apps I use in 2024 2024-06-30 05:00pm
• Figma Config recap 2024-06-28 05:00pm
• Being funemployed, and all that jazz 2024-06-21 05:00pm
• Greetings, future billionaires 2024-06-17 11:38am
• The Merge in Berlin recap 2024-06-15 05:00pm
• Nice keyboards make me want to write blogs 2024-05-31 09:55am
• I rewrote my blog! And website! They are one! 2024-05-18 05:00pm
• Front-end Design Conference recap 2024-04-29 05:00pm
• Seattle and the internet 2024-04-15 05:08pm
• Non-traditional push presents 2024-04-05 05:00pm
• I love reading fantasy again 2024-03-30 09:52pm
• Building W-9 Crafter 2024-03-21 02:25pm
• Styling a CSS pseudo-element with JavaScript 2024-03-04 04:00pm
• Jumblie has a database! 2024-02-24 04:00pm
• Tips for posting on LinkedIn 2024-02-23 04:00pm
• How to test a browser extension locally 2024-02-16 04:00pm
• Sorting Git branches 2024-02-15 07:46am
• Use CSS accent-color to style your inputs 2024-01-29 04:00pm
• HTML "self-awareness" with sibling indexing in JavaScript 2024-01-27 04:00pm
• Base CSS for your text-based pages 2024-01-18 11:56pm
• Kind of annoyed at React 2024-01-12 04:00pm
• I miss human curation 2024-01-11 04:00pm
• Jumblie 100 2024-01-10 10:52pm
• Experimenting with AI voice 2024-01-05 04:00pm
• Cassidy Williams... who is she 2023-12-31 04:00pm
• Buh bye, 2023 2023-12-30 04:00pm
• Stock options, vesting, and exercising, oh my 2023-12-29 04:00pm
• Publishing to my blog from Obsidian 2023-12-27 04:00pm
• Ideal fishing spots 2023-12-17 04:00pm
• Geek mama... saying no 2023-12-12 09:55pm
• Making a single line break in markdown 2023-12-09 10:00pm
• Cassidy's Gift Guide 2023 2023-12-08 10:00pm
• Jumblie Build Log 2023-11-28 10:50am
• A use-case for CSS :has() 2023-11-18 11:09pm
• My first go tournament 2023-11-04 05:07pm
• Adding co-authors to TinaCMS's Git commits 2023-11-02 07:39pm
• How and when to use keys in React 2023-10-27 05:34pm
• Thirteen Potions Build Log 2023-10-21 10:13pm
• Trying out TinaCMS 2023-10-20 10:29pm
• Calling an imported API at runtime in Astro 2023-09-21 10:00pm
• Co-authoring Git commits 2023-08-26 10:00pm
• Why I like Astro 2023-08-09 10:00pm
• Maternity TV 2023-07-13 05:00pm
• Dear Cassidy of 2 months ago 2023-07-11 05:00pm
• Open standards, trust, and Google 2023-06-20 05:00pm
• Removing trailing space underlines from groups of anchor tags 2023-06-13 05:00pm
• Turning todos into tadas 2023-05-19 05:00pm
• My c-section experience 2023-05-05 05:00pm
• Three ways to set headers with Netlify and Astro 2023-04-13 10:00pm
• The Productivity apps I use in 2023 2023-04-07 05:00pm
• Memorize quotes 2023-03-26 05:00pm
• I made a bookmark out of stickers 2023-03-10 04:00pm
• When useEffect runs 2023-02-09 10:00pm
• Quirky local delights 2023-02-07 04:00pm
• Setting up Netlify Redirects with Astro 2023-02-02 10:00pm
• Loving and hating the streak 2023-01-26 04:00pm
• The small, private wins 2023-01-25 04:00pm
• Importing SVG files as React components with Vite 2023-01-05 10:00pm
• See ya, 2022 2022-12-30 04:00pm
• My language brain is... broken? 2022-11-28 04:00pm
• Two(ish) months at Contenda 2022-11-15 04:00pm
• Passing Markdown components to React or Preact in Astro 2022-10-25 10:00pm
• Managing knowledge on a team 2022-08-14 05:00pm
• Hello, world 2022-08-07 05:00pm
• Saying goodbye to my crappy vision 2022-07-27 05:00pm
• Moose facts 2022-07-12 10:00pm
• How to break the cycle of tech debt 2022-06-05 05:00pm
• Customizing my Zsh Prompt 2022-05-30 10:00pm
• Renaming a folder on the GitHub website 2022-04-27 10:00pm
• Make line breaks work when you render text in a React or Vue component 2022-04-08 10:00pm
• Use Unicode characters for bullet points in CSS using ::marker 2022-04-06 10:00pm
• Being available: The secret to great leadership 2022-04-03 05:00pm
• The Productivity apps I use in 2022 2022-03-21 10:00pm
• Adding a lang attribute to your Next.js site 2022-02-07 10:00pm
• Do successful products prioritize familiarity over uniqueness? 2022-01-31 04:00pm
• Build wicked fast sites with Astro: An Introduction 2021-07-07 10:00pm
• React 18 Alpha is out! Now what? 2021-06-07 10:00pm
• Shallow Routing in Next.js 2021-06-01 10:00pm
• Pursuing Passive Learning 2021-03-27 10:00pm
• Making a virtual credits sequence for your video calls with OBS and CodePen 2021-02-22 10:00pm
• An Incredibly Serious Discussion about Next.js at Reactathon 2020-12-19 10:00pm
• Enabling AMP in your Next.js projects 2020-12-18 10:00pm
• Adding Babel presets and plugins in Next.js 2020-12-17 10:00pm
• React Children: The misunderstood prop 2020-12-16 10:00pm
• Query an API at both build time and runtime with Next.js 2020-12-15 10:00pm
• How to turn off telemetry in Next.js 2020-12-14 10:00pm
• Add Web Monetization to your sites with Snippet Injection 2020-12-13 10:00pm
• Logging in Next.js 2020-12-12 10:00pm
• Deploy from CodePen to Netlify in less than 30 seconds 2020-12-11 10:00pm
• React Strict Mode in Next.js 2020-12-10 10:00pm
• Environment variables in Next.js and Netlify 2020-12-09 10:00pm
• Global Styles in Next.js 2020-12-08 10:00pm
• Making a custom 404 page in Next.js 2020-12-07 10:00pm
• Absolute Imports in Next.js 2020-12-06 10:00pm
• Why you should code together: Mob Programming FAQs 2020-12-05 10:00pm
• Building a custom React media query hook for more responsive apps 2020-12-04 10:00pm
• "Escaping" Next.js to access the browser 2020-12-03 10:00pm
• What is React Fast Refresh? 2020-12-02 10:00pm
• Next.js: Should I use SSR or SSG? 2020-12-01 10:00pm
• Using React Context for state management in Next.js 2020-11-30 10:00pm
• Avoiding burnout as an ambitious developer 2020-01-12 04:00pm
• Apollo Mission - The Pros and Cons of Being an Early Adopter of New Technology 2019-08-27 05:00pm
• Giving people what they do not need: mild panic 2019-07-29 05:00pm
• I'm going to write for Stack Overflow! 2019-07-09 05:00pm
• How I built my CSS Rice Ball Dessert 2019-06-27 05:00pm
• I spoke at DinosaurJS and React Loop last week 2019-06-25 05:00pm
• How I built my (mostly) CSS Light Switch Toggle 2019-05-14 05:00pm
• Leaky Bucket 2019-05-12 05:00pm
• I made a game called Flapjack Fwop 2018-12-28 04:00pm
• Follow your dreams (literally): How I designed and launched the Official Scrabble Keyboard 2018-04-03 10:00pm
• Building todometer: a meter-based to-do list 2017-04-29 10:00pm
• Building My S60-X Keyboard 2016-12-31 04:00pm
• L4 Digital: First Impressions 2016-12-01 04:00pm
• Writing Practice: The Agua Caliente Airport 2016-11-01 05:00pm
• Subconscious Learning 2016-03-15 05:00pm
• Pure CSS3 Text Carousel 2016-03-03 04:00pm
• Closures in JavaScript 2016-02-24 04:00pm
• Messing with Sketch Club 2016-02-21 04:00pm
• 5 applications of linear regression that will drive him crazy 2015-11-15 04:00pm
• Adding Keyboard Shortcuts to your React Apps 2015-08-02 05:00pm
• Making the Whitney Houston API 2015-07-25 05:00pm
• Picking your brain: Cold call email etiquette 2015-07-19 05:00pm
• One year at Venmo 2015-07-12 05:00pm
• A Brief History of the PNG 2015-06-14 05:00pm
• The CSS Image Values Spec 2015-06-06 05:00pm
• Finding a Mentor 2015-06-05 05:00pm
• The positives coming from the negatives 2015-01-19 10:00pm
• A Weekend at BattleHack Boston 2014-08-09 05:00pm
• My last days at ISU 2014-04-29 05:00pm
• How to ask for help 2014-04-23 05:00pm
• 10 Tips for Successful Public Speaking 2014-04-15 05:00pm
• The laptop you need for college 2014-04-13 05:00pm
• HackISU Hackathon!! 2014-04-07 10:00pm
• How to Ace an Interview 2014-03-03 04:00pm
• Things you should have on your LinkedIn profile 2014-02-26 04:00pm
• What is Computer Science ACTUALLY like? 2014-02-24 10:00pm
• My Talk at TEDxDesMoines 2014-02-21 04:00pm
• Feedback is awesome 2014-02-21 04:00pm
• My "romantic" Valentine's Day plans! 2014-02-13 10:00pm
• HTML+CSS Tutorial, Part 2 2014-02-09 04:00pm
• HTML+CSS Tutorial, Part 1 2014-02-09 04:00pm
• Here come the 2013 Mashups! 2013-12-29 10:00pm
• Inspirational quotes to get you through the day 2013-12-11 10:00pm
• I am better than you at everything 2013-12-08 10:00pm
• Things you should have on your LinkedIn profile 2013-11-25 10:00pm
• Finding your dream major in college 2013-11-13 10:00pm
• Crushing Procrastination in 3 Steps 2013-11-03 10:00pm
• Design Your First iPhone App 2013-10-20 10:00pm
• Tips for remembering names 2013-10-06 10:00pm
• 5 Questions to Ask Your Boss 2013-09-29 10:00pm
• Networking as a college student 2013-09-15 10:00pm
• A Weekend at PennApps 2013-09-09 10:00pm
• Crushing the Impostor Syndrome 2013-07-22 10:00pm
• Startup Weekend Ames 2013-04-16 10:00pm
• Happy Pi Day! 2013-03-13 10:00pm
• I went to the White House! 2013-02-04 10:00pm
• What's a house that's white in Washington D.C.? 2013-01-27 10:00pm
• Grace Hopper in Baltimore! 2012-10-02 10:00pm
• Facebook's 2012 Summer of Hack 2012-08-09 10:00pm
• This is how a rock star feels 2012-07-19 10:00pm
• How my big bod broke a bus 2012-03-07 10:00pm
• I can't see! 2012-01-19 10:00pm
• System.out.print("My Major"); 2011-03-21 10:00pm
• Just Dancing. 2011-01-01 10:00pm
• Boo yah. 2010-12-18 10:00pm
• The T in Often 2010-04-20 10:00pm
• Amazing and Free Software 2010-03-21 10:00pm
• The Wrist Keyboard 2009-02-01 10:00pm
• Hum de dum 2009-01-07 10:00pm
• Hello. 2009-01-05 10:00pm