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Joe Z

@underflow.dev
166 followers 182 following 273 posts

5 decades of Colorado, writing software for astronomy, ecology, precision timing, medical devices, and hardware integration. Opinions are my own.

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Joe Z @underflow.dev · 27/09/2026
View from the CCC trail in the Colorado national monument.
A view of the scrub desert with cliffs in the foreground and Grand Junction in the background. Off in the distance is the grand Mesa. white fluffy clouds float overhead in a blue sky.
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Joe Z @underflow.dev · 13/09/2026
Hey, I built a thing! For fun! US housing prices vs per-capita income at the county level, from 2000 to 2026. Image is for June of 2026. The west is expensive relative to income. Explore and see animations, county, and state level data at underflow.dev/housing
A heat map of the US, showing counties.  Counties are colored by their housing price to income ratio: darker counties have a higher ratio. In general, the western US appears to have larger, darker counties than the middle of the US.  The eastern US has darker counties near population centers.
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Joe Z @underflow.dev · 28/08/2026
And now Codex, a dedicated coding tool, wants access to... my music applications and history? Seriously, what? Fuck. Off.
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Joe Z @underflow.dev · 28/08/2026
Day 2 of fasting, for the first time in a while. My liver: hey, where's the sugar, dammit‽
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Joe Z @underflow.dev · 27/08/2026
So spotify, a distributed mp3 player, now wants access to... my travel plans? And double pinky promises to never share my info? Fuck off.
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Joe Z @underflow.dev · 11/08/2026
The border Aussie dog demanded to go outside at 2am. She happily sprints out to find the imaginary raccoon. So I wait. And wait. Call her. Find my shoes, drag into the yard. She’s sitting on the sand pile, little nubbin of a tail going like mad, happy as can be to have trolled me. #dogs
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Joe Z @underflow.dev · 05/08/2026
Archer thinks walks are for hunting. Holly thinks they’re for finding a shady patch, and maybe some sheep will show up. 
Archer the border collie mix dog standing on a field, staring intenselyHolly, the border Aussie, laying on her belly and looking for sheep. 
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Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 19/06/2026
"Astrophysics research is in trouble". Yup, we've brought in the big guns to #SaveUKAstronomy, particle and nuclear physics! Thank you @drbecky.bsky.social 🙏 📽️: www.youtube.com/shorts/omICc...
youtube.com
Astrophysics research is in trouble... #shorts
YouTube video by Dr. Becky
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Joe Z @underflow.dev · 18/06/2026
Props to Joe Fassler, @wcraft.bsky.social, and Andrew Witherspoon writing for @theguardian.com in the US on oil well cleanup. www.theguardian.com/environment/.... Really great article.
theguardian.com
There are thousands of dirty old drill sites in Colorado. The state gave oil firms a $1bn pass
Investigation reveals regulator let firms off the hook on cleanup bonds despite backlog that will take decades to clear
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Joe Z @underflow.dev · 13/06/2026
Archer the border collie mix tried to flush this rabbit out from under the tree. Alas, it’s a rock. One very sore nose.
The bottom of a blue spruce tree with a barely visible rock that looks almost exactly like a bunny.
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Joe Z @underflow.dev · 02/06/2026
Tearing apart your house can lead to enlightenment. Like, why is that room always so cold in the winter? #diy
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Joe Z @underflow.dev · 14/05/2026
Archer burrows.
Archer the border collie mix, sitting in a dug out hole in a pile of dirt with a garden in the background
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Richard Morris @ahistoryinart.bsky.social · 08/05/2026
Gustav Klimt was 17 years old in 1879 when he drew (with charcoal and black chalk) this portrait of a young girl. His superb technical ability as a draughtsman is evident even as a teenager in the way he uses shadow to create a three-dimensional picture on paper.
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Joe Z @underflow.dev · 02/05/2026
Holly is the cuddliest home body.
Holly the border-Aussie, laying upside down on a couch and mugging for the camera.
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Joe Z @underflow.dev · 02/05/2026
Holly the border-Aussie wiggle butt.
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Joe Z @underflow.dev · 17/04/2026
Not sure the cherries are going to make it this year.
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John Bistline @bistline.bsky.social · 01/04/2026
This is my favorite climate change chart. Japanese monks, aristocrats, and emperors kept meticulous records of cherry blossom festivals for 1,200 years and accidentally built the world's longest climate dataset.
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Joe Z @underflow.dev · 30/03/2026
Did the Moab thing. Broken arch front and back, getting hot.
The front of the broken arch, a geological formation of red sandstone arching over blue sky.The back of broken arch, with desert sand and scrub in the foreground.
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Joe Z @underflow.dev · 29/03/2026
Hard to capture the scope of the cliffs in Moab, but there’s a person in this image. #climbing
Red sandstone cliffs above Take-Out Beach near Moab, UT. A small climber is at the base of a route on the cliff.
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A.J. Kazlouski @abandonedrocketship.com · 24/03/2026
I really liked the last chapter of the manga! The anime still has a lot of ground to cover to catch up, but the movie they put out most recently was a great time.
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Joe Z @underflow.dev · 13/03/2026
Marketing emails need something stronger than unsubscribe.
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Joe Z @underflow.dev · 11/03/2026
Playing around with University of Colorado salary data and Claude. underflow.dev/cu/, project at github.com/underflowdev.... Accuracy not guaranteed, but interesting.
A strip chart showing the distribution of all salaries across the CU system.
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Joe Z @underflow.dev · 27/02/2026
Goodby to the amazing Tacoma pickup that carried me around for 265k miles. I hope @coloradopublic.bsky.social can find you a good home.
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Joe Z @underflow.dev · 23/02/2026
Haven’t used terraform for three months. 🤪
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Joe Z @underflow.dev · 19/02/2026
Today in DIY: learning that fish tape isn’t.
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Joe Z @underflow.dev · 17/02/2026
Sometimes r/experienceddevs nails it. old.reddit.com/r/Experience...
old.reddit.com
An AI CEO finally said something honest
Dax Raad from anoma.ly might be the only CEO speaking honestly about AI right now. His most recent take: “everyone's talking about their teams...
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Joe Z @underflow.dev · 05/02/2026
Last weekend’s hike on the Wapiti trail at Heil Valley Ranch west of Longmont, CO
A trail head map on a sign. It’s titled Heil Valley Ranch, with a map showing the trail route and a You Are Here label.Several burned tree trunks in a dry valley with brown grass and rocks.A dry, brown grass meadow, with a singled dead pine tree in the right foreground, and a line of living pines in the distance.The trail leading back down the valley.
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Amanda Rae Taylor @mandy-moodles.bsky.social · 12/01/2026
#snow #quiet #trail #hike #sunday
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Joe Z @underflow.dev · 12/01/2026
If you see this, skeet an archer.
Archer the border collie mix dog, stretched out on the bed towards the camera, with a lamp in the background.
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Amanda Rae Taylor @mandy-moodles.bsky.social · 10/01/2026
#Eagle #trail loop is pretty #glorious today for #snow #bordercollies #blue #skies and #views
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Niki @nikitonsky.mastodon.online.ap.brid.gy · 05/01/2026
New blog post! A close look at Tahoe menu icons tonsky.me/blog/tahoe-icons
tonsky.me
It’s hard to justify Tahoe icons
Looking at the first principles of icon design—and how Apple failed to apply all of them in macOS Tahoe
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Joe Z @underflow.dev · 05/01/2026
Did the nighthawk/bitterbrush trail west of Lyons, CO. Warm, with lots of fallen trees up top from the last windstorm. #hiking #colorado
Sign for the nighthawk trail west of Lyons, COA small group of deer on the trail.The top of the trail, with the twin sisters and Indian peaks in the distance.A fallen tree, with the rootball sticking out of the soil.
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Joe Z @underflow.dev · 01/01/2026
Holly, my lovable jerk of a herding rescue.
A border Aussie dog eagerly facing the camera.
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Amanda Rae Taylor @mandy-moodles.bsky.social · 31/12/2025
Archer Huntington Squirrel esq. On #point #bordercollie #rescue #dog
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Joe Z @underflow.dev · 29/12/2025
Hey Goodreads, if you don't pay attention to your unsubscribes, you go in the spam bucket. So, goodbye forever, I guess?
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Joe Z @underflow.dev · 25/12/2025
Baking progress.
Dough made into rolls and rising, carrot cake cooling before being frosted.
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Joe Z @underflow.dev · 25/12/2025
Future carrot cake.
Ingredients for carrot cake, including shredded carrots, pineapple, cinnamon, vanilla, oil, flour, and sugar.
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Joe Z @underflow.dev · 25/12/2025
About to hand my work over to the bread robot.
Mixture of ingredients for bread, including flour, water, butter, brown sugar, and yeast.
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The Colorado Sun ☀️ @coloradosun.com · 24/12/2025
Time is up for operators of a beloved Grand Junction farm market
coloradosun.com
Time is up for operators of a beloved Grand Junction farm market
Okagawa Farms' owners say they’re ready to move on after 34 years and have put a “for sale” sign on their operation near the Colorado River
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John Spurlock @johnspurlock.com · 18/12/2025
‘In 2026, I’m hoping — begging, really — that we finally retire the idea that digital incompetence is an acceptable personality quirk in professional settings.’ www.niemanlab.org/2025/12/plea...
niemanlab.org
Please learn how to use your computer
"The number of professionals in journalism, media, communications, and academia who still don't understand how to use the very tools they depend on for their livelihood is, frankly, staggering."
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Amanda Rae Taylor @mandy-moodles.bsky.social · 09/12/2025
Two #bordercollie mixes just being the best #dogos #Archer and #Holly
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Amanda Rae Taylor @mandy-moodles.bsky.social · 03/12/2025
#wreath of #khan #startrek #trekkie #christmas
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Erik Angner @erikangner.com · 27/11/2025
"Runctitiononal features"? "Medical fymblal"? "1 Tol Line storee"? This gets worse the longer you look at it. But it's got to be good, because it was published in Nature Scientific Reports last week: www.nature.com/articles/s41... h/t @asa.tsbalans.se
Infographic with AI slop published in Nature Scientific Reports
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The Colorado Sun ☀️ @coloradosun.com · 26/11/2025
The move would save the state money in the short term to address Colorado’s budget crisis, but it could cost the pension as much as $180 million in the long run.
coloradosun.com
As budget crisis grows, Colorado governor looks to cut PERA payments
The move would save the state money in the short term to address Colorado’s budget crisis, but it could cost the pension as much as $180 million in the long run.
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Joe Z @underflow.dev · 11/11/2025
Here are Holly and Archer waiting for @mandy-moodles.bsky.social to get off work. Spot the herd dog #dog
Black and white border collie mixes, sitting on concrete stairs, with sidewalks and locked bikes in the background.Black and white border collie mixes, sitting on concrete stairs, with sidewalks and locked bikes in the background. Holly continues to stare into o the distance while Archer casually looks around.Black and white border collie mixes, sitting on concrete stairs, with sidewalks and locked bikes in the background. Holly’s gaze still attempting to burn through the brick.Black and white border collie mixes, sitting on concrete stairs, with sidewalks and locked bikes in the background. Archer back to looking in the same direction as Holly.  Holly maintains her vigil.
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Joe Z @underflow.dev · 03/11/2025
Snow in the high country once again. Archer approves. #dog
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Joe Z @underflow.dev · 03/11/2025
A robber jay dropped by on today’s hike. #bird
A gray female robber jay perched on a dry snag of wood, looking to see what food I might share.
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Joe Z @underflow.dev · 24/10/2025
A little hike past the sunflowers west of Longmont

An outdoor picture of a close gate decorated with flowers. On the right in the background is a silo painted with sunflowers.
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Joe Z @underflow.dev · 18/10/2025
The Cinnamon Roll Project, part 2. Milk rather than water, no powdered milk. Shorter cut rolls, so less pan overflow. Less overnight rise, good spring in the oven.
Unbaked cinnamon rolls in two round pans, and some untied shoes.Baked cinnamon rolls now filling two pans. Shoes still untied.
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Joe Z @underflow.dev · 14/10/2025
Oh, uh, hi Xcode, I see you bouncing up and down there. Yeah, sorry, I don't need you right now, it's just an .md file. If you could just go back into your box for another six or eight months, that would be great.
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