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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 · 18/09/2026
For sure, it’s a spicy one.
A map of Indiana in a lightning tracker showing many many strikes north of Indianapolis and west 
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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 · 17/08/2026
Had a long walk, finally in the rain, with the trouble twins.
Holly the border-Aussie walking on a dirt road north of Boulder, CO. Flatiron hills off in the distance.Holly the border-Aussie laying on the yellowing summer grass, alertly looking for sheep.Archer the border collie mix, with a wet head from jumping in a stream. He’s wondering why we’re not hunting more rabbits (which he is not allowed to eat).
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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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Joe Z @underflow.dev · 19/06/2026
Okay, it’s a She-Hulk villain, but I’ve always had a soft spot for DOCTOR BONG! Yes, it’s deeply unserious.
A two panel comic. Left panel: a man with a bell for a head saying “paralyzed is the operative word, she – Hulk – – if that is your name. The result of an exposure to the smallest part of the power of DOCTOR BONG!” Right panel: She-Hulk gesturing at Doctor Bong, and saying “Doctor Bong?!? is this some kind of joke?? The fantastic four and Spider-Man got Dr. doom in their fifth issues. I get this clown?”
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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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Joe Z @underflow.dev · 02/05/2026
Holly and Archer, the troublemakers.
Holly the border-Aussie upside down on the couch.Archer the cattlelab bordershepherd at attention.
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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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Joe Z @underflow.dev · 08/04/2026
Aussie fronts?
Holly the border Aussie taking her human for a walk, by naughtily grabbing the leash.
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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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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 · 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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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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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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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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Joe Z @underflow.dev · 24/12/2025
And do surveillance cameras reduce crime? Eh, not really: www.comparitech.com/vpn-privacy/...
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Joe Z @underflow.dev · 28/11/2025
It’s a talent.
Border Aussie named Holly stretched out on a couch.
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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 · 12/10/2025
The Cinnamon Roll Project.
Unbaked cinnamon rolls in a 9 inch round pan. Also a rolling pin and dough scraper.Baked cinnamon rolls in a 9 inch round pan.  Also a rolling pin and dough scraper.
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Joe Z @underflow.dev · 08/09/2025
This evening’s view of the Longmont Climbing Collective building. #rainbow #climbing
The Longmont Climbing Collective building, backed by a rainbow and high level clouds.
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Joe Z @underflow.dev · 08/09/2025
Not for everyone, but it holds up well 35 years later.
The cover art for Steve Vai’s 1990 album Passion and Warfare.
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Joe Z @underflow.dev · 29/08/2025
Waiting for the throw..
Archer the mixed border collie waiting for tennis ball to be thrown. The sunset in the background over the reservoir.
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Joe Z @underflow.dev · 09/08/2025
DDG has an interesting alternative suggestion.
A search result from DuckDuckGo. It shows a partial typing of “winter’s tale he”. The suggested results are “winter’s tale Hermione X Bucky fanfic”, and “Winters tale Helprin”.
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Joe Z @underflow.dev · 02/08/2025
Every baker should have a book like this floating around the kitchen. Full of recipes you would take to that high school potluck in 1995. My favorite carrot cake recipe. #baking
A yellow black plastic bound recipe book. The cover says choice hotels international with a drawing of a dinosaur combine with a suitcase. Underneath the dinosaur it says Choiceasaurus, Dino-mite recipes, followed by our commitment… Your choice 1993A carrot cake recipe from the book, with notes from the baker. The recipe is one and 1/2 cups of flour, one cup of sugar, half a teaspoon of salt, 2/3 cup of salad oil, 1 teaspoon of soda, two eggs, 1 teaspoon of baking powder, one cup of shredded carrots, 1 teaspoon of cinnamon, 1 teaspoon of vanilla, half a cup of crushed pineapple with syrup. Mix until moistened about two minutes and pour in a 9 x 9” pan. This can be doubled for a larger cake. Bake at 350 degrees for 35 minutes.
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Joe Z @underflow.dev · 01/08/2025
Union Reservoir
A white sign with green text. It says attention dog guardians. Please pick up after your dogs. Attention dogs, grrrr, bark woof, good dog. At the bottom and white text on a green background it says thank you
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Joe Z @underflow.dev · 20/07/2025
Well, that looks familiar.
@mandy-moodles and Archer the border collie cross goofing around on the couch.
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Joe Z @underflow.dev · 26/06/2025
Short post meeting break in the backyard. @mandy-moodles.bsky.social ‘s garden is amazing this year.
A red Flagstone pathway surrounded by stonecrop and lemon verbena
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Joe Z @underflow.dev · 25/06/2025
Archer, the mighty rabbit hunter #dogs
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Joe Z @underflow.dev · 17/06/2025
Went in to work today. Nice view.
The flatirons in Boulder, covered by clouds and with the biotech building in the foreground
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Joe Z @underflow.dev · 14/06/2025
Just west of Longmont, with the flat irons in the background
Field of grass backed by a farmhouse, with the flat iron mountains in the background
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Joe Z @underflow.dev · 05/06/2025
Allergy season approaches.
Grass flower pods not yet opened
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Joe Z @underflow.dev · 01/06/2025
Holly is my “carry-me-to-the-sheep” dog.
A mixed breed border Aussie laying in a pile of snow.  The snow is dusted with dirt, pine needles, and small pine cones.A border Aussie lying with her nose buried in a pile of snow.A border Aussie lying on top of a tall pile of snow, ready to take a nap in the sun, rather than walking back home.
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Joe Z @underflow.dev · 01/06/2025
Spring is almost to the mountains.
A US Forest Service brown wooden sign showing directions to Brainard Lake and the Snowshoe Trail.Two mixed breed border collies walking down a paved road.  The road is streaked with melted snow, and is bordered by large berms of snow and pine trees on both sides.An arch of dirty snow produced by melting.
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Joe Z @underflow.dev · 01/06/2025
The two types of snow dogs.
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Joe Z @underflow.dev · 07/05/2025
@catsofyore.bsky.social This image of a photo from 1970’s Durango, CO is Pumpkin. The tiny orange puffball turned neighborhood bully, and all-around tough guy. Later in life, he lost an eye and became the elder states-cat, sleeping on my bed every night. I was not consulted.
A blurry image of a long furred orange cat, sitting on a fence above a snow bank.
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Joe Z @underflow.dev · 17/04/2025
A few little mushrooms from yesterday’s dog walk.
Clusters of brown mushrooms, about the size if a hand, erupting from the soil amid wood chips.
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Joe Z @underflow.dev · 15/04/2025
One of my lovely daughters took me to Alton Brown’s live show last night (which was great for both the content and the company), and I came away with this fantastic Thermo Buck. I think my thermodynamics prof would approve.
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