Courtney Yatteau
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cyatteau.bsky.social
Courtney Yatteau
@cyatteau.bsky.social
Developer Advocate at Esri | International Conference Speaker | Former Math/CS Educator | opinions = my own | http://youtube.com/@c_yatteau
Joined the caricature trend ✅

Former teacher turned Dev Advocate, still educating… just with maps and code now 😄🗺️
February 14, 2026 at 5:22 PM
Love when the calendar does math. 🧮

#math #calendar
February 13, 2026 at 9:02 PM
Day.js is a great shortcut for timestamp UX.

calendar() gives human labels like "Today" and "Tomorrow", and tz() handles real time zones (built on the UTC plugin).

#JavaScript #OpenSource #WebDev
February 13, 2026 at 6:24 PM
Happy Internet Friends Day 🫶

Shoutout to everyone who makes tech education feel welcoming. You make the internet better.
February 13, 2026 at 4:18 PM
Developer Summit at Esri FedGIS wrapped yesterday. My colleagues and I shared demos highlighting the latest enhancements across ArcGIS developer technology.

Missed it? Feel free to message me, I'm happy to share some demos.

#FedGIS2026 #Esri #ArcGIS
February 12, 2026 at 10:10 PM
Day 1 of Esri FedGIS done ✅ I'd love to see you at the Developer Summit at FedGIS tomorrow at 1 PM.

#FedGIS2026 #Esri #ArcGIS
February 11, 2026 at 1:15 AM
I got to nerd out about math today on a podcast! 🤓

We chatted about math + web dev, learning through visuals, and why curiosity never stops. Episode comes out in a couple weeks.

Have you ever had a "wait… THAT'S what it means?!" math moment? If so, I'd love to hear it!

#WebDev #STEM #JS #Math
February 5, 2026 at 9:07 PM
Guided UI walkthroughs in a few lines of JS. Bonus guided map builder app 🗺️

#OpenSource #JavaScript #WebDev #UI
February 5, 2026 at 2:09 PM
One week until the Developer Summit General Session at Esri FedGIS 👩🏻‍💻🗺️

Join us in Ballroom A on Feb 11, then stay for technical sessions. My colleagues and I will be sharing live demos and would love to meet everyone!

See the event map: webapps-cdn.esri.com/CDN/fedgis-e...

#FedGIS2026 #Esri #GIS
February 4, 2026 at 6:13 PM
SortableJS drag and drop for FOSSFeb Day 2. Bonus GIS game!

#FOSSFeb #OpenSource #JavaScript #WebDev
February 4, 2026 at 12:00 PM
Code for the shadow app I posted yesterday is up 👩🏻‍💻 This demo version is rule-based, and I also built an AI-powered version with a quick video walkthrough.

🗺️ Code: codepen.io/cyatteau/pen...
🎥 Video: www.youtube.com/watch?v=ooj5...

#JavaScript #AI #GIS #ArcGIS
February 3, 2026 at 8:32 PM
Build your own Leaflet map for FOSSFeb Day 1. New open source tutorial every weekday in February.

Link to game: leaflet-game.netlify.app

#FOSSFeb #Leaflet #JavaScript #OpenSource
February 3, 2026 at 1:13 AM
Groundhog Day inspired a shadow experiment 🌥️🗺️

I built a 3D shadow analysis mini app. Adjust the time range, hover to sample shadow duration, click to pin and explain.

I’ll share the code soon 👩🏻‍💻

#ArcGIS #GIS #3D #maps
February 2, 2026 at 7:53 PM
It's FOSSFeb (Free and Open Source Software February) 💙 Let's celebrate open source web dev all month!

What project should I feature? Comment it below.

#JavaScript #OpenSource #WebDev
February 1, 2026 at 4:47 PM
It's Fun at Work Day and I'm like... wait, that’s just my job! 😄🗺️

I get to build demos that show developers fun ways to use Esri services.

If you missed it, yesterday I posted a map tile puzzle app I built.
arcgis-puzzle-game.netlify.app

See the code: codepen.io/cyatteau/pen...

#ArcGIS #maps
January 30, 2026 at 7:05 PM
If you like puzzles and maps, this is for you 🧩🗺️

For Puzzle Day, I built a map tile puzzle using the ArcGIS Geocoding Service and the ArcGIS Static Basemap Tiles service.

Play now: lnkd.in/eKbJgj7z

Code coming soon 👩🏻‍💻

#ArcGIS #maps #puzzle
January 29, 2026 at 8:12 PM
𝗜𝘁'𝘀 𝗧𝗵𝗮𝗻𝗸 𝗮 𝗣𝗹𝘂𝗴𝗶𝗻 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝗗𝗮𝘆!

MapLibre GL JS + ArcGIS basemap styles and layers, made easier with the MapLibre ArcGIS plugin. 🗺️

#ArcGIS #MapLibre #GIS
January 29, 2026 at 2:57 AM
Almost a year since FedGIS 2025, and FedGIS 2026 is just a couple weeks away. If you're going, say hi so I can watch for you!

www.esri.com/en-us/about/...

#FedGIS2026 #GIS #Esri #ArcGIS
January 23, 2026 at 7:02 PM
Make heatmaps spicy with AI-generated color palettes for Hot Sauce Day! 🌶️🎨

#ArcGIS #JavaScript #GIS
January 22, 2026 at 7:52 PM
Perfect centering with CSS Grid

#CSS #WebDev #Frontend
January 22, 2026 at 3:34 PM
𝗖𝗵𝗲𝗲𝘀𝘆 𝗦𝗼𝗰𝗸𝘀 𝗗𝗮𝘆 fuel for coding. 🧦💻

What are you coding today?

#code #developer #coding
January 21, 2026 at 9:25 PM
Happy Coffee Break Day! ☕

Quick reminder: take 5 minutes to reset. Your brain will thank you and your code will too.

#coding #webdev #work
January 20, 2026 at 9:03 PM
New to web dev? This is one thing you'll see everywhere: JSON.

#webdevelopment #coding
January 17, 2026 at 6:07 PM
2016 me was thriving in the classroom. What were you up to?

#TwentySixteen #TeacherLife #Throwback
January 16, 2026 at 4:33 PM
Fresh squeezed + map glass = my map building fuel. 🧃🗺️ Mappy Fresh Squeezed Juice Day!
January 15, 2026 at 10:03 PM