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Cassidy
@cassidoo.co
32K followers 920 following 2K posts
Making memes, dreams, & software!
Sr. Director of Dev Advocacy at GitHub. Married to a dweeb and mom to a nerdy toddler + baby combo. She/Her ✝️ CHI 🏠

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Cassidy @cassidoo.co · Nov 4
Hey new friends!

I'm Cassidy, based in Chicago.

I work at @github.com, and I love building projects, advising startups, helping people learn, and making memes.

Most of my work is open source, and I have a weekly newsletter and blog at cassidoo.co. Check it out, and see you around!
Cassidy Williams
I'm Cassidy Williams, a software engineer, mom, and overall nerd in Chicago. I write about tech, projects, and whatever else I'm thinking about!
cassidoo.co
Reposted by Cassidy
cassidoo.co
I opened up newsletter sponsorship slots for the next ~year! If you are interested in reaching a techy audience, check out the dates here and let me know if you have questions (you can DM me instead of filling out any forms).

FAQs/deets: cassidoo.co/newsletter/s...
Availability: cass.run/nss
December 26, 2025 at 7:35 AM
cassidoo.co
I opened up newsletter sponsorship slots for the next ~year! If you are interested in reaching a techy audience, check out the dates here and let me know if you have questions (you can DM me instead of filling out any forms).

FAQs/deets: cassidoo.co/newsletter/s...
Availability: cass.run/nss
December 26, 2025 at 7:35 AM
Reposted by Cassidy
cassidoo.co
PHEW I wrapped up #blogvent 2025!! Happy holidays y'all, I'm going to be an offline blob for Christmas with the fam. 🎁❤️

cassidoo.co/post/blogven...
Wrapping up Blogvent 2025
Don't be sad that Blogvent is over, be happy that Blogvent happened. Here's all the posts I wrote in December 2025!
cassidoo.co
December 25, 2025 at 5:33 AM
cassidoo.co
PHEW I wrapped up #blogvent 2025!! Happy holidays y'all, I'm going to be an offline blob for Christmas with the fam. 🎁❤️

cassidoo.co/post/blogven...
Wrapping up Blogvent 2025
Don't be sad that Blogvent is over, be happy that Blogvent happened. Here's all the posts I wrote in December 2025!
cassidoo.co
December 25, 2025 at 5:33 AM
Reposted by Cassidy
jonathanyeong.com
A wild @cassidoo.co in her natural habitat has been spotted
December 24, 2025 at 3:46 PM
Reposted by Cassidy
lupusmic.org
Current mood
cassidoo.co Cassidy @cassidoo.co · 3d
Behold, the end of year developer. An unflinching look at the survival period of "working" during the holidays.

www.youtube.com/watch?v=ps06...
The End of Year Developer: A Nature Documentary
YouTube video by Cassidy Williams
www.youtube.com
December 24, 2025 at 3:11 PM
Reposted by Cassidy
valscion.bsky.social
www.artmann.co/articles/30-... A trip down the memory lane! For me, it's been the last 20 years. Time flies!

Hat tip to @cassidoo.co's amazing newsletter for this link 🙇
30 Years of <br> Tags
Three decades of making things on the internet
www.artmann.co
December 24, 2025 at 7:58 PM
cassidoo.co
For #blogvent day 23, I wrote about the end of year developer nature documentary 🌳

cassidoo.co/post/nature-...
Making the "End of Year Developer" nature documentary
The creation of an unflinching look at the survival period of "working" during the holidays.
cassidoo.co
December 24, 2025 at 7:41 AM
Reposted by Cassidy
cassidoo.co
Behold, the end of year developer. An unflinching look at the survival period of "working" during the holidays.

www.youtube.com/watch?v=ps06...
The End of Year Developer: A Nature Documentary
YouTube video by Cassidy Williams
www.youtube.com
December 23, 2025 at 4:29 PM
Reposted by Cassidy
overcommitted.dev
Released today! We sat down with Cassidy Williams @cassidoo.co to talk about building a career in developer advocacy, the power of mentorship, and how DevRel has evolved.

Cassidy shares her philosophy of "lifting as you climb," what makes great DevRel hires, and even her dream keyboard setup 👀
Ep. 39 | Lifting as you Climb: Cassidy Williams on DevRel, Mentorship, and Building for Developers
Spotify video
open.spotify.com
December 23, 2025 at 8:59 PM
Reposted by Cassidy
helen.blog
It's been a whirlwind year, including that @github.com put me back on fixing papercuts/"tiny wins" for OSS maintainers! In 5 months a team of just 2 engs plus me and another proper PM shipped 15 things, so I made a little app to celebrate 12 of them 💖 helen.github.io/12-days-of-t...
12 Days of Tiny but Mighty Wins
helen.github.io
December 23, 2025 at 5:34 PM
cassidoo.co
Behold, the end of year developer. An unflinching look at the survival period of "working" during the holidays.

www.youtube.com/watch?v=ps06...
The End of Year Developer: A Nature Documentary
YouTube video by Cassidy Williams
www.youtube.com
December 23, 2025 at 4:29 PM
cassidoo.co
For #blogvent day 23, I wrote about styling attribution in blockquotes generated by markdown!

cassidoo.co/post/css-quo...
CSS for markdown blockquote attribution
When you generate an HTML blockquote from markdown, your resulting HTML needs some styling love.
cassidoo.co
December 23, 2025 at 6:11 AM
Reposted by Cassidy
cassidoo.co
It's a holly jolly newsletter 🎄
It's the best time of the week ❄️

cassidoo.co/newsletter
rendezvous with cassidoo
A weekly newsletter with web development content for everyone, from beginners to pros.
cassidoo.co
December 22, 2025 at 10:11 AM
cassidoo.co
It's a holly jolly newsletter 🎄
It's the best time of the week ❄️

cassidoo.co/newsletter
rendezvous with cassidoo
A weekly newsletter with web development content for everyone, from beginners to pros.
cassidoo.co
December 22, 2025 at 10:11 AM
cassidoo.co
I wrote about apps being "done" rather than being updated for eternity for day 21 of #blogvent:

cassidoo.co/post/finishe...
I like when apps are "finished"
Sometimes the software we see out there doesn't need to be further updated. Sometimes it's just good enough!
cassidoo.co
December 22, 2025 at 5:55 AM
Reposted by Cassidy
jonathanyeong.com
TIL creating a .github repository will share configurations across all your repos. Very neat! Thanks for sharing it @cassidoo.co

cassidoo.co/post/dot-git...
Configure your repositories with .github
The .github folder (and .github repository) is special for customizing your projects to your liking. Here's what you can do!
cassidoo.co
December 22, 2025 at 1:11 AM
cassidoo.co
For today's #blogvent post (day 20!) I wrote an update post to what I wrote about last year: writing utensils. I may be beyond help.

cassidoo.co/post/writing...
I have become more of a writing utensil snob
I really like nice pencils and pens and it's not a problem, I am totally in control? But I probably have too many now.
cassidoo.co
December 21, 2025 at 5:21 AM
Reposted by Cassidy
cassidoo.co
For #blogvent day 19, I wrote about all you can do with .github on... GitHub!

cassidoo.co/post/dot-git...
December 20, 2025 at 5:49 AM
Reposted by Cassidy
brittanyellich.com
Finally, I can be a real programmer with a real keyboard!
A mechanical keyboard with sweet astrology keys designed by Cassidy Williams because she's super neat and keyboard obsessed. I blame her for this wallet dent.
December 20, 2025 at 4:59 AM
cassidoo.co
For #blogvent day 19, I wrote about all you can do with .github on... GitHub!

cassidoo.co/post/dot-git...
December 20, 2025 at 5:49 AM
cassidoo.co
Annnd I'm streaming on my channel now! Come on by!

www.twitch.tv/cassidoo
cassidoo - Twitch
Open source, gabbing, and end of year shenanigans
www.twitch.tv
December 18, 2025 at 8:29 PM
cassidoo.co
Come join us for the last Rubber Duck Thursday of the year!

YouTube: www.youtube.com/watch?v=mGTW...

Twitch: www.twitch.tv/github
December 18, 2025 at 7:05 PM
cassidoo.co
I wrote about what I want to spend more time learning, someday, for #blogvent day 17!

cassidoo.co/post/what-i-...
Things I would study more if I had time
There's so much I want to learn and so little time in the day!
cassidoo.co
December 18, 2025 at 5:02 AM
cassidoo.co
I wrote about what I want to spend more time learning, someday, for #blogvent day 17!

cassidoo.co/post/what-i-...
Things I would study more if I had time
There's so much I want to learn and so little time in the day!
cassidoo.co
December 18, 2025 at 5:01 AM