Cassidy
@cassidoo.co
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 🏠
Subscribe to my newsletter!
cassidoo.co/newsletter
Sr. Director of Dev Advocacy at GitHub. Married to a dweeb and mom to a nerdy toddler + baby combo. She/Her ✝️ CHI 🏠
Subscribe to my newsletter!
cassidoo.co/newsletter
Pinned
Cassidy
@cassidoo.co
· Nov 4
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
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!
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!
My phone finally updated to Liquid Glass!
who allowed this to happen
who allowed this to happen
January 13, 2026 at 4:16 PM
My phone finally updated to Liquid Glass!
who allowed this to happen
who allowed this to happen
Reposted by Cassidy
Hippie dippie a newsletter is coming your way!
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
rendezvous with cassidoo
A weekly newsletter with web development content for everyone, from beginners to pros.
cassidoo.co
January 12, 2026 at 8:17 AM
Hippie dippie a newsletter is coming your way!
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
I noticed the issues listed here, too. Make sure you add a robots.txt file to your sites if you haven't already!
www.alanwsmith.com/en/37/wa/jz/...
www.alanwsmith.com/en/37/wa/jz/...
Fix Your robots.txt or Your Site Disappears from Google
a post from alan w. smith
www.alanwsmith.com
January 12, 2026 at 11:54 PM
I noticed the issues listed here, too. Make sure you add a robots.txt file to your sites if you haven't already!
www.alanwsmith.com/en/37/wa/jz/...
www.alanwsmith.com/en/37/wa/jz/...
Hippie dippie a newsletter is coming your way!
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
rendezvous with cassidoo
A weekly newsletter with web development content for everyone, from beginners to pros.
cassidoo.co
January 12, 2026 at 8:17 AM
Hippie dippie a newsletter is coming your way!
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
I've got some fresh, hand-crafted:
- Web links
- A joke
- A practice coding question
- Some bits and bobs and mooore!
Check out the archive and subscribe here:
cassidoo.co/newsletter/
Reposted by Cassidy
New year, new website.
Here's a little (big) write up about the evolution of my website, and some of the new fun things I built in the redesign.
p.s. please don't find any bugs, thank you
Here's a little (big) write up about the evolution of my website, and some of the new fun things I built in the redesign.
p.s. please don't find any bugs, thank you
I redesigned my website (again)
It's been almost 3 years since my last website redesign. Read about its evolution, new things in the redesign, and my quest to make my website more personal.
whitep4nth3r.com
January 9, 2026 at 7:17 PM
New year, new website.
Here's a little (big) write up about the evolution of my website, and some of the new fun things I built in the redesign.
p.s. please don't find any bugs, thank you
Here's a little (big) write up about the evolution of my website, and some of the new fun things I built in the redesign.
p.s. please don't find any bugs, thank you
I wrote up this post after going through the Octoverse report for this past year!
It's super interesting and kind of obvious that because humans aren't writing as much code across codebases, they're leaning into stricter tooling that offers better reliability.
github.blog/ai-and-ml/ll...
It's super interesting and kind of obvious that because humans aren't writing as much code across codebases, they're leaning into stricter tooling that offers better reliability.
github.blog/ai-and-ml/ll...
Why AI is pushing developers toward typed languages
AI is settling the “typed vs. untyped” debate by turning type systems into the safety net for code you didn’t write yourself.
github.blog
January 9, 2026 at 1:22 AM
I wrote up this post after going through the Octoverse report for this past year!
It's super interesting and kind of obvious that because humans aren't writing as much code across codebases, they're leaning into stricter tooling that offers better reliability.
github.blog/ai-and-ml/ll...
It's super interesting and kind of obvious that because humans aren't writing as much code across codebases, they're leaning into stricter tooling that offers better reliability.
github.blog/ai-and-ml/ll...
Reposted by Cassidy
Abolish and prosecute ICE. They did a murder in broad daylight today. Imagine what they're doing in the closed facilities we're somehow not even allowed to see.
January 7, 2026 at 6:20 PM
Abolish and prosecute ICE. They did a murder in broad daylight today. Imagine what they're doing in the closed facilities we're somehow not even allowed to see.
If you're wanting to pick up a new habit in the new year, consider checking out my newsletter's practice coding question each week!
The most recent issue:
buttondown.com/cassidoo/arc...
The most recent issue:
buttondown.com/cassidoo/arc...
January 7, 2026 at 9:26 PM
If you're wanting to pick up a new habit in the new year, consider checking out my newsletter's practice coding question each week!
The most recent issue:
buttondown.com/cassidoo/arc...
The most recent issue:
buttondown.com/cassidoo/arc...
my keynote will be me just saying, "I thought this was about how swiftly I could eat a deep dish"
📣 Keynote Speaker Announcement
We’re thrilled to have @cassidoo.co at Deep Dish 26 🎉
Chicago native & Senior Director of Developer Advocacy at GitHub, passionate about education and building the developer community.
She’s giving an opening keynote you won’t want to miss 😁
We’re thrilled to have @cassidoo.co at Deep Dish 26 🎉
Chicago native & Senior Director of Developer Advocacy at GitHub, passionate about education and building the developer community.
She’s giving an opening keynote you won’t want to miss 😁
January 7, 2026 at 9:24 PM
my keynote will be me just saying, "I thought this was about how swiftly I could eat a deep dish"
Reposted by Cassidy
📣 Keynote Speaker Announcement
We’re thrilled to have @cassidoo.co at Deep Dish 26 🎉
Chicago native & Senior Director of Developer Advocacy at GitHub, passionate about education and building the developer community.
She’s giving an opening keynote you won’t want to miss 😁
We’re thrilled to have @cassidoo.co at Deep Dish 26 🎉
Chicago native & Senior Director of Developer Advocacy at GitHub, passionate about education and building the developer community.
She’s giving an opening keynote you won’t want to miss 😁
January 7, 2026 at 5:47 PM
📣 Keynote Speaker Announcement
We’re thrilled to have @cassidoo.co at Deep Dish 26 🎉
Chicago native & Senior Director of Developer Advocacy at GitHub, passionate about education and building the developer community.
She’s giving an opening keynote you won’t want to miss 😁
We’re thrilled to have @cassidoo.co at Deep Dish 26 🎉
Chicago native & Senior Director of Developer Advocacy at GitHub, passionate about education and building the developer community.
She’s giving an opening keynote you won’t want to miss 😁
Reposted by Cassidy
I'm back on the writing train! Thanks @cassidoo.co for blogvent, because it got me sharing my writing consistently again and I needed that push. Yesterday I wrote some thoughts and observations about my garden in winter.
marisamorby.com/garden-thoug...
marisamorby.com/garden-thoug...
Garden Thoughts: January 5th
Thoughts today as I worked in the garden under the winter sun.
marisamorby.com
January 6, 2026 at 11:36 PM
I'm back on the writing train! Thanks @cassidoo.co for blogvent, because it got me sharing my writing consistently again and I needed that push. Yesterday I wrote some thoughts and observations about my garden in winter.
marisamorby.com/garden-thoug...
marisamorby.com/garden-thoug...
Did you know you can get your GitHub profile pic by adding .png to your profile page? It's super handy!
github.com/cassidoo.png
github.com/cassidoo.png
January 6, 2026 at 11:04 PM
Did you know you can get your GitHub profile pic by adding .png to your profile page? It's super handy!
github.com/cassidoo.png
github.com/cassidoo.png
This made me so mad
Wordle 1,662 5/6
⬜⬜⬜⬜⬜
⬜🟩⬜⬜⬜
🟨🟩🟨⬜⬜
⬜🟩🟩⬜🟨
🟩🟩🟩🟩🟩
Wordle 1,662 5/6
⬜⬜⬜⬜⬜
⬜🟩⬜⬜⬜
🟨🟩🟨⬜⬜
⬜🟩🟩⬜🟨
🟩🟩🟩🟩🟩
January 6, 2026 at 9:00 PM
This made me so mad
Wordle 1,662 5/6
⬜⬜⬜⬜⬜
⬜🟩⬜⬜⬜
🟨🟩🟨⬜⬜
⬜🟩🟩⬜🟨
🟩🟩🟩🟩🟩
Wordle 1,662 5/6
⬜⬜⬜⬜⬜
⬜🟩⬜⬜⬜
🟨🟩🟨⬜⬜
⬜🟩🟩⬜🟨
🟩🟩🟩🟩🟩
Reposted by Cassidy
Reposted by Cassidy
@cassidoo.co's newsletter has me opening links and watching videos I would have never dreamed of opening/watching in my life 😂 my YouTube algorithm must be so confused on Mondays.
January 4, 2026 at 11:21 AM
@cassidoo.co's newsletter has me opening links and watching videos I would have never dreamed of opening/watching in my life 😂 my YouTube algorithm must be so confused on Mondays.
Reposted by Cassidy
I haven't coded since last year hurr durr
January 1, 2026 at 6:00 AM
I haven't coded since last year hurr durr
Reposted by Cassidy
Reposted by Cassidy
It's the last newsletter issue of 2025, come one, come all!
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
rendezvous with cassidoo
A weekly newsletter with web development content for everyone, from beginners to pros.
cassidoo.co
December 29, 2025 at 8:00 AM
It's the last newsletter issue of 2025, come one, come all!
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
It's the last newsletter issue of 2025, come one, come all!
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
rendezvous with cassidoo
A weekly newsletter with web development content for everyone, from beginners to pros.
cassidoo.co
December 29, 2025 at 8:00 AM
It's the last newsletter issue of 2025, come one, come all!
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
Check out the archive and subscribe here to start your 2026 off right:
cassidoo.co/newsletter/
Reposted by Cassidy
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
FAQs/deets: cassidoo.co/newsletter/s...
Availability: cass.run/nss
December 26, 2025 at 7:35 AM
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
FAQs/deets: cassidoo.co/newsletter/s...
Availability: cass.run/nss
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
FAQs/deets: cassidoo.co/newsletter/s...
Availability: cass.run/nss
December 26, 2025 at 7:35 AM
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
FAQs/deets: cassidoo.co/newsletter/s...
Availability: cass.run/nss