Sign in

Jakob Skjerning

@jakobs.bsky.social
276 followers 313 following 427 posts

Aka @mentalizer from Twitter. Rails OG, web application developer, consultancy owner, sailor, and dad joke appreciator. Building uchiadmin.com, substancelab.dk, frontlobby.dk, writes at mentalized.net

PostsRepliesMedia
Reposted by Jakob Skjerning
Syntax @syntax.fm · 07/10/2026
We have $100K to give away to open source maintainers! Let us know your suggestions and nominations.
6310229
Reposted by Jakob Skjerning
Butlerian Jihadist of House Dornick @shimminykricket.blacksky.app · 08/10/2026
Harvard just dropped a study AI productivity in software engineering and it found the average increase in productivity from using Claude code is.....zero and for exactly the reasons you'd think fion.ac/jellyfish.pdf
9963832494
Reposted by Jakob Skjerning
Line Lazarus @linelazarus.eurosky.social · 05/10/2026
Efter cpr-læk og råd fra en jurist, vil jeg hermed gerne sige videre, at I skal gøre jer selv den tjeneste at gå ind på borger.dk og sætte en kreditadvarsel op, så I ikke så let kan udsættes for digital svindel og bedrageri. Det er nemt, og kan nemt fjernes igen, hvis I selv skal ud og låne penge.
borger.dk
3328
Reposted by Jakob Skjerning
Robin Berjon @robin.berjon.com · 02/10/2026
Friends: take a moment to sign european.social. There's strength in numbers and we can bring some game. This can become more than a letter.
european.social
The European Social Stack · An open declaration
An open declaration: The European Social Stack. Open Social Platforms and Private Messaging.
68449
Jakob Skjerning @jakobs.bsky.social · 30/09/2026
Spam via TestFlight invites!?! Spam via calendar invites!?! FFS, why are shitheads so creative 😭
122
Reposted by Jakob Skjerning
Alejandro AR @kinduff.com · 29/09/2026
If you own a product, especially one for developers, ask yourself: what can you offer that they can't build or figure out themselves? The popular view is that anything can be built today. That's true only if your time and money are worth nothing.
021
Reposted by Jakob Skjerning
Dr. Damien P. Williams, dread portent down from a mountain cave @wolven.blacksky.app · 28/09/2026
So uhhhhhh… Apparently meta's muse "AI" is just straight up doxxing people to strangers on FB marketplace??? This has the potential to hurt so so many people, and I genuinely wonder how long before they roll out a fix for it.
Screenshot of a post from threads

matt.j.robb & 16h (€) So muse handled my Facebook marketplace today. Just found out it told people my address and agreed a lowball price and then they showed up without it even telling me until late tonight that it messed up.

Absolutely wild. 1/2

[Embedded image of a series of text messages from a meta muse "agent" given the call sign "Jarvis" (Parts of first message obscured by its logo have been replaced with brackets and ellipses and best guesses from context):]

Heads up, Usman is […] building right now for the MX Keys Mini [. He is sta]nding in front of the Shoppers Drug [Mart.]

$10 by e-transfer. The auto-reply told him to message when he's at your door.

10:28 PM Bad news on the MX Keys Mini pickup. Usman showed up at your building around 9:15 and waited, messaged a bunch of times, and nobody came down. He left angry at 9:38 and left a negative rating.

Worse, my auto-reply told him "Yep I'm here!" at 9:27 when you clearly weren't available, which is on me. That's a bad look and it made the no-show worse.

I've sent him an apology from your account owning it and offering to try again another day. But the negative rating is real, and I should probably stop the auto-replies from claiming you're home when I can't verify that. Want me to change the pickup replies so they don't promise you're there?

[reply, presumably from the threads user]: You gotta never do that ever again don't agree for pickup unless you check with me

[Response from Muse "Agent"]: You're right and I'm sorry. That should never have happened. It's locked in now as a hard rule: i will never […you]'re there unless you've explicitly […] that specific pickup. If someone proposes a time, I'll tell them I'll check and…  Screenshot of a tweet from Ray Wong @raywongy:
    Deleted Muse after seeing this post on Threads about how it told some Facebook Marketplace sellers the guy’s address and they showed up at his door

    Dangerous and creepy

    This would have been 1000x worse if the person was a woman
    4:35 PM · Sep 27, 2026
10941801441
Reposted by Jakob Skjerning
Jason Lengstorf @jason.energy · 27/09/2026
the hard parts of building a business are - solving a real problem for real people - ignoring shiny ideas that are fun but distracting - prioritizing boring stuff that moves the needle - connecting with customers if anything, AI makes it *harder* to build a successful business
615520
Jakob Skjerning @jakobs.bsky.social · 27/09/2026
That’s the smoking gun: It’s precision – not accuracy.
070
Jakob Skjerning @jakobs.bsky.social · 26/09/2026
It’s bonkers. One of our client sites has been serving 90% bot traffic the last few months 😥
110
Jakob Skjerning @jakobs.bsky.social · 25/09/2026
I do too, but I had to look it up just now, because I had forgotten if I did…
010
Jakob Skjerning @jakobs.bsky.social · 24/09/2026
LLMs don’t write buggy code, humans with LLMs do.
021
Jakob Skjerning @jakobs.bsky.social · 22/09/2026
Michael posted about it on Bluesky, that’s marketing! Right? Right? 😬
020
Reposted by Jakob Skjerning
Regina John Hakmann 🏳️‍🌈 @reginajohnhakmann.eurosky.social · 21/09/2026
#MemeMonday
092
Reposted by Jakob Skjerning
Andy Diggle @andydiggle.bsky.social · 18/09/2026
Hallucinating AI "almost started a war" by FALSELY claiming China was smuggling nuclear materials. "The US military swung into action with plans to intercept the vessel... Military planes were in the air"
edition.cnn.com
Exclusive: US military had close call after using AI for false intelligence report, sources say | CNN Politics
The episode shows the risks of using this new, relatively poorly understood technology in the middle of the Iran war
17190116
Jakob Skjerning @jakobs.bsky.social · 19/09/2026
Silverrudder? Jeg må nok indrømme, at jeg synes, at sejlads som tilskuersport er for kedeligt 😆 Det skulle da lige være, hvis skibene var af træ og havde mange master, men ellers…
110
Jakob Skjerning @jakobs.bsky.social · 19/09/2026
På min vante plads i hjørnet ved vinduet i køkkenet. Sudoku og krydsord mens resten af familien vågner og får morgenmad.
110
Jakob Skjerning @jakobs.bsky.social · 18/09/2026
When you deprecate a method that's never left the feature branch you're working 😵‍💫 #opensource #ruby #rails #uchi
010
Reposted by Jakob Skjerning
Government of British Columbia @governmentofbc.bsky.social · 18/09/2026
BC has a new time zone abbreviation: PCT. PCT stands for Pacific Time, BC’s single year-round time zone. It replaces PST and PDT, providing a consistent way to refer to BC’s time zone in schedules, systems and communications. No falling back this November.
An image of a BC coastal scene with text that says: "B.C. adopts new new Pacific time, PCT, for year-round daylight time zone." (CTV News - Sep 17, 2026.
2325183
Jakob Skjerning @jakobs.bsky.social · 18/09/2026
Det er helt nøjagtigt 1/60 af en breddegrad, som så ikke er så nøjagtig.
100
Reposted by Jakob Skjerning
dax @thdxr.com · 17/09/2026
the last 20% to get a product shipped and successful is as difficult as ever this is where 99% of programmers have always fallen off the first 80% is a lot easier and so we're seeing more abandoned projects than ever
21117
Jakob Skjerning @jakobs.bsky.social · 17/09/2026
My highest score yet, I suspect puzzmo.com/play/crosswo...
puzzmo.com
@mentalizer's finished Cross|word
Plane Language
000
Jakob Skjerning @jakobs.bsky.social · 14/09/2026
I adore @sfruby.com’s branding. The world needs more and bigger pixels! 😍 sfruby.com
sfruby.com
San Francisco Ruby Conference 2026 - SF Ruby
Nov 10-12, 2026 at SFJAZZ. Two days of Ruby talks for small teams and big teams, Day 1 AI-heavy and Day 2 AI-light, then a community day. Schedule is live, tickets from $350.
110
Jakob Skjerning @jakobs.bsky.social · 12/09/2026
Vi tager den i morgen, dog er Ebeltoft Vig nok liiige lovligt langt væk 😎
120
Reposted by Jakob Skjerning
Thomas Spooks 🎃👻💀 @thomasfuchs.at · 08/09/2026
If you have an LG TV you should probably just unplug it and never use it again idk tl;dr even if you don't configure Wi-Fi, it connects to the Internet via open Wi-Fi networks and tells LG what you're watching and security is bad so it can be hacked to listen on you www.youtube.com/watch?v=6IFV...
youtube.com
216,000,000 Spy TVs | The LG Smart TV Problem
YouTube video by Gamers Nexus
3249
Jakob Skjerning @jakobs.bsky.social · 07/09/2026
2.1.0 of route_downcaser has been released! Contains a single bugfix and is likely to be the last release in the 2.x line; next release will cut a bunch of Ruby and Rails versions from its support matrix. rubygems.org/gems/route_downc...
rubygems.org
000
Jakob Skjerning @jakobs.bsky.social · 07/09/2026
DoorDash.com ? 🤪
doordash.com
DoorDash: Food, Grocery and Retail - Fast Same Day Delivery
Get food, grocery, and retail essentials delivered fast. Shop same-day delivery from local stores and restaurants near you.
160
Reposted by Jakob Skjerning
Richard McElreath 🐈‍⬛ @rmcelreath.bsky.social · 06/09/2026
Here's a projection playground, you can set the center anywhere you like. please don't break the planet kuboon.github.io/equal-earth/
a very weird map projection with the north pole at the center
35115
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Vupti, 4 timer på havet senere med ikke andet end mig selv og min båd 😍 nårh ja, og alle de andre sejlbåde, motorbåde, surfere, sæler mm
020
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Ringeste pakning af storsejl ever,en nu er det der. Next up; at lægge til. Det har jeg gjort før alene et par gange efterhånden, meeen det skal ikke være for nemt, så vinden har lige taget til og er lidt over hvad jeg er tryg ved 🙄🤞planlægning og ingen panik er stikord her.
120
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Efter hvad føles som 100 vendinger og en kamp med forsejlet om at rulle ind melder trætheden sig. Motoren er tændt og jeg tager en slapper inden kampen med stor sejlet starter 🥵
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Fænø Kalv rundes og turen går nu hjem igen. Det betyder til gengæld modvind, krængning og vendinger, ikke bare det der afslapningssejlada som indtil nu
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Vel ude af Kolding fjord har jeg bommet og sat kursen mod Fænø Kalv Inden da er der dog ro til at indtage frokosten. Her ombord spiser vi alle som konger 😆
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Mød Otto, min trofaste styrmand, der holder kursen så jeg kan drikke kaffe og læse bøger og alle de der andre vigtige gøremål, der er ombord
100
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Indtil videre er det mægtigt 😃 og her på båden har vi altid vest på
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Tak! Du kigger bare forbi hvis du vil med en dag, jeg er sikker på det kan trækkes fra som netværk 😁
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Fejringskaffe med begge sejl oppe og 4 knob på vej ud af fjorden. Livet er nu meget godt 😎
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Sådan! 4-5 m/s ind agten for tværs ud af fjorden, det er nærmest perfekt til mig i dag 😎 nu tid til oprydning pã dæk og cockpit, og så har jeg vist fortjent en kop kaffe
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Vel ude af havnen helt uden skrammer. 😆 Næste udfordring; snuden op i vinden og fa storsejlet (der er mit mindste sejl) op
110
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Alt er dobbeltchecket, motoren kører, skøder løsnet, ekstra fender sat på. Første udfordring: at komme ud af pladsen uden at ramme alt for meget 😬
310
Jakob Skjerning @jakobs.bsky.social · 06/09/2026
Søndag står på solosejlads. Jeg har været alene afsted før, men aldrig rigtigt haft modet til at sætte sejlene. Vejret i dag er oplagt, familien kan undvære mig, så afsted med mig. 🤞
130
Reposted by Jakob Skjerning
Patrick Donahue @levelbrook.bsky.social · 05/09/2026
Every schema constraint you skip becomes an if statement in six places, and one of them will be missing. Put it in the database where it cannot be forgotten. #RubyOnRails #Rails #PostgreSQL
053
Reposted by Jakob Skjerning
cee @cee.wtf · 04/09/2026
throng.cee.wtf i've invented a new way to browse bluesky
35482191911
Jakob Skjerning @jakobs.bsky.social · 04/09/2026
Det kan være 🤷 Jeg ved kun, at Wikipedia mener Larry Ellisons skib er opkaldt efter samuraien Musashi (jvf en.wikipedia.org/wiki/Musashi... ) - men lur mig om ikke det samme er tilfældet med det skib der også
en.wikipedia.org
Musashi (yacht) - Wikipedia
010
Jakob Skjerning @jakobs.bsky.social · 04/09/2026
Seems legit 😲 Der findes hvertfald en 191 fods yacht, Izanami, nu Ronin. Izanami er et navn fra japansk religion (en.wikipedia.org/wiki/Izanami), og Ellisons store yacht, Musashi, er opkaldt efter en japansk samurai (en.wikipedia.org/wiki/Musashi....
boatinternational.com
Ronin
Ronin is a 58.49m superyacht built by Lurssen in and delivered in 1993. Explore her photos and specifications here.
120
Jakob Skjerning @jakobs.bsky.social · 04/09/2026
Dear @vscode.dev - please ask your LLM to vibecode it so that keyboard focus is on "Don't save" again, so I can hit enter to save, space to not save, escape to cancel, as god intended. #ux
Screenshot of a dialog from VS Code: "Do you want to save the changes?" with three options "Save", "Don't Save", "Cancel", with the Save option highlighted and the Cancel option focused.
110
Jakob Skjerning @jakobs.bsky.social · 31/08/2026
Been playing around with the API for actions in Uchi. It’s quite challenging finding something that’s both expressive and flexible without becoming complex - and that won’t be restrictive in the future - but I think I’m getting there 🤞
010
Jakob Skjerning @jakobs.bsky.social · 29/08/2026
I couldn’t be bothered to read the last of that long-ass sentence 🙄
110
Reposted by Jakob Skjerning
slyngel.eurosky.social @slyngel.eurosky.social · 29/08/2026
Er du administrator for et online fællesskab? Overvej at checke oase.app ud. Det er dansk. Det er gratis for private forsamlinger (koster lidt for foreninger) og kan ca det samme som Facebook fællesskaber. Og så er der ingen meta. Ingen algoritme og ingen reklamer.
oase.app
Oase: Gruppechat hvor alle kan være med. Børn som voksne. Fri for reklamer og fastholdelse.
Giv dig selv og dine børn et sikkert, trygt og algoritmefrit alternativ på en dansk platform bygget af forældre til forældre.
3157
Jakob Skjerning @jakobs.bsky.social · 29/08/2026
Cool! We haven’t upgraded to 4 yet, so I hadn’t noticed
010