The Engineer Who Gives It All Away
There is a certain kind of person in tech who accumulates knowledge the way others accumulate frequent flyer miles - obsessively, competitively, and always with an eye on the next tier. Cassidy Williams is not that person. Cassidy Williams is the person who notices you looking at the lounge map and quietly hands you a guest pass.
Her entire career reads like a deliberate rejection of the idea that knowledge is a competitive advantage. From the moment she stepped onto Iowa State's campus, she was running study groups, organizing hackathons, and dragging reluctant classmates toward the keyboard. The CS club presidency wasn't a resume line. It was a worldview in action. When the National Center for Women and Information Technology sent her to represent students at the White House Tech Inclusion Summit in 2014, she went to listen and to report back - not to be seen.
The United Nations speech came her senior year, part of a project to empower women in STEM. She was 21 or 22. She was terrified. She went anyway. This will become a recurring theme.
After graduation came the New York startup years, then the coast hop west, then the tour of companies that spans half a decade: Venmo (developer evangelist), Clarifai (lead developer evangelist), Amazon (where she ran developer voice programs and applied the company's famous "one-breath test" to Alexa skill design - if you can't say it in one breath, your response is too long). Each role was bigger or more prestigious than the one before it. She left each one for something smaller and more interesting.
"I've really learned that I like small companies," she said, after leaving Amazon for a role at CodePen as employee number eight. CodePen, for those unfamiliar, is the beloved browser-based code playground used by frontend developers worldwide. Being employee number eight at CodePen is the kind of thing that sounds casual until you realize what it means: you are building the thing, not just representing it. Cassidy was building.
The newsletter started as a low-key project. "rendezvous with cassidoo" - the name alone tells you something about how she operates. No LinkedIn-speak. No personal brand optimization. Just a weekly appointment between Cassidy and whoever shows up: a coding challenge, a roundup of what's cool in web development, a joke (often a bad one), and photos of mechanical keyboards. It grew from under 100 subscribers to over 15,000. The growth happened not because she optimized for it but because the product was genuinely, stubbornly, consistently good.
The mechanical keyboard thing deserves its own paragraph, because it perfectly illustrates how Cassidy Williams works. She didn't just get into keyboards as a consumer. She designed keycap sets. She shipped an officially licensed Scrabble keyboard set with Clackeys Inc. - actual physical products that left her hands and ended up under the fingers of enthusiasts across the world. She ran a Twitch series called "C+C Hacking Factory" with her sister Cami. She built Alexa skills on camera. She made things, and she made them publicly.
After stints at Netlify (Director of Developer Experience), Remote, and a brief CTO role at Contenda - an AI content platform - she landed at GitHub in the role of Senior Director of Developer Advocacy. The fit is almost too obvious. GitHub is where developers live. Cassidy has spent her career making that life better.
In early 2026, she published a piece on the GitHub Blog about AI pushing developers toward typed languages - specifically noting that TypeScript had become the most-used language on GitHub, growing by over a million contributors in a single year. She's been thinking about these patterns, watching the developer landscape shift, and writing about it with the clarity of someone who has been a working engineer through multiple waves of hype and genuine change.
She speaks everywhere: the Grace Hopper Celebration for Women in Computing, TEDx, Figma Config, Codemotion Madrid, Deep Dish Swift in Chicago, TechCamp Korea in Seoul. She speaks at universities. She speaks at conferences where she's the most junior person in the room and at conferences where she's the keynote. She does it because she believes your voice could inspire someone to take the next step - and she holds herself accountable to that belief.
Cassidy describes herself as an introvert. People who have seen her on stage find this hard to believe. People who understand introversion understand it completely. The energy she brings to a room is real. It also costs something. She's deliberate about replenishing it: building keyboards alone, playing music, hanging out with her family, making memes, writing her newsletter from whatever quiet corner she can find.
Her dream workspace is, characteristically, both specific and slightly absurd: a makerspace and arcade hybrid, with better lighting, a pinball machine, an arcade cabinet, a laser cutter, a 3D printer, and an upgraded gaming PC. It's the workspace of someone who wants to make things - all kinds of things - and who has enough self-knowledge to know exactly what fuels her. This is what a decade of "lift as you climb" looks like up close. Not a philosophy on a poster. A person in a room, building something, leaving the door open behind her.