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Sean Killeen

@seankilleen.com
1.5K followers 857 following 1.3K posts

A mind at work. 💼 VP, Innovation and Products at SCT Software 🥇 Microsoft #MVP 📣 Organizer of #dotnetdc ✔️ Docs lead / Core Team member of the #NUnit project ♾️ Agility, DevOps, smaller loops 🌎 Kindness, empathy, humanity

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Sean Killeen @seankilleen.com · 26/09/2026
Friday night is typically when administrations do the things they're proudest of, right?
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Sean Killeen @seankilleen.com · 24/09/2026
Psst if you're returning an HTTP 5xx error but the error message is about validation findings on the input, you probably want that to be a 4xx error. #HowIsThisStillAThing
static.klipy.com
The More You Know
Alt: "The More You Know", text speeding through space on a star with a rainbow as a sort of trailing comet-style tail. A clip from 90s-era public service announcements / programming.
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Sean Killeen @seankilleen.com · 21/09/2026
If you are developing and running a cloud-based product in production, in 2026, and you are unable to detect a major loss of functionality and communicate it clearly to consumers, you are unprofessional. Full stop.
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Sean Killeen @seankilleen.com · 20/09/2026
An easy decision this week: our team handily voted to keep and pay the OSMF for @simoncropp.bsky.social's Verify .NET. Verify is a snapshot testing tool/ecosystem and it's great. Here's how it went down: #dotnet #oss #osmf
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Mar Hicks @histoftech.bsky.social · 19/09/2026
Precisely this—the power attributed to technology makes it incredibly useful for laundering responsibility
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Sean Killeen @seankilleen.com · 19/09/2026
The best recovery from an insane work week: neighborhood Celtic fest! I am eating Shepherd's pie and drinking a Smithwicks in the middle of a beautiful day. Perfect.
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Sean Killeen @seankilleen.com · 18/09/2026
Revisited my blog post series from 7 (?!) years ago today, I'm really happy with how well it's held up. Do you run interviews? You might find it useful. seankilleen.com/2019/09/bett...
seankilleen.com
Better Technical Interviews: Part 1 – What’s the point?
This post is part of a series I’m writing on better technical interviews. I’d love your feedback in the comments! Part 1 - What’s the Point? Part 2 - Preparation Part 3 - The Actual Interview ...
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Sean Killeen @seankilleen.com · 18/09/2026
Just dusted off a process I created and automated 2+ years ago, in about 10 minutes. Will save dozens of hours for the teammate using it. A nice win for a Friday. 🎉
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Sean Killeen @seankilleen.com · 17/09/2026
They're not outsourcing the decisions so much as attempting to outsource the accountability. Innocent people will die because of this, and blame will be avoided, unless we ensure it's not.
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Sean Killeen @seankilleen.com · 09/09/2026
CW: Alcohol I treated myself to a birthday present tonight: a scotch I'd been staring at for a long time but just couldn't justify. :) Balvenie Portwood 21. Absolutely *delightful*. Everything I personally could want in a scotch. An experience. 40, we'll get along just fine I think.
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Keith Law @keithlaw.bsky.social · 08/09/2026
once again, this should be front-page news all over the world, the President of the USA just fabricated an entire story about himself
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Sean Killeen @seankilleen.com · 08/09/2026
Ringing in a new decade today. A good reminder that we never get it back. Onward!
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Sean Killeen @seankilleen.com · 06/09/2026
Thread numbering is a lovely, well-done feature. Thanks @bsky.app!
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Sean Killeen @seankilleen.com · 06/09/2026
Almost done ripping out our @bitnami.bsky.social usage after they burned all their OSS goodwill and tried to charge us $60k/year to use 3 helm charts. Will feel good to be rid of them. Another great project torched by enterprise capture.
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Steve Brazill @stevebrazill.com · 05/09/2026
Another important post you should read from @masnick.com. TLDR: Age verification is bad. Longer TLDR: Avoid having your ID scanned for any reason. www.techdirt.com/2026/09/03/h...
techdirt.com
Hackers Had A Live Feed Of Every ID This Verification Company Scanned. For Over A Year.
From the very beginning of this recent obsession with identifying everyone online (yes, they like to call it "age" verification, but it always ends up as identity verification), we've been pointing out that it was a huge privacy nightmare waiting to happen. Or maybe it wasn't waiting. Maybe it was already happening. This week a...
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Sean Killeen @seankilleen.com · 03/09/2026
Will be interesting to see who recovers 1Password's fumble. Looking like BitWarden will do well. Their devops tooling and kubernetes operator seem poised to make transition easier for businesses as well.
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Sisyphus, but for reducing tail latency @bluespacecanary.bsky.social · 03/09/2026
incredible work by 1PW leadership fucking up bad enough that a fight over Arch Linux for Racists escaped containment so completely that now Jamelle Bouie's telling 750k very online millennials, almost certainly the demographic most likely to pay for 1PW, to go cancel their 1PW subscription tonight
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Marisa Kabas @marisakabas.bsky.social · 01/09/2026
I was nominated for an award and today is the last day to vote! Help me win and go vote for The Handbasket!
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Sean Killeen @seankilleen.com · 30/08/2026
Weirdly, in its price hike announcement FAQ to customers, @atlassian.bsky.social doesn't answer "hey, didn't you fire 10% of your staff for AI? Why didn't that prevent a price increase?"
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Sean Killeen @seankilleen.com · 30/08/2026
Random thought: JDD - Joneses Driven Development. Where AI leaders make you think everyone is doing it, so you also try to do it, and the AI leaders get your money (a lot of it) Evolve things from your own context. Seek to improve from where you are. Gall's Law is still a thing.
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Sean Killeen @seankilleen.com · 30/08/2026
Having laryngitis is not very compatible with being Dad to a 6yo. But I do have one more reason to be glad that he's a great reader!
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Sean Killeen @seankilleen.com · 29/08/2026
This latest illness has been bonkers. 2 days of 102 degree fever / chills etc. and now... laryngitis? Weird.
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Merill Fernando 💚 @merill.net · 28/08/2026
👋 Folks after year long hiatus the community powered database of aka•ms is back!! Bookmark it 👇 akams.fyi PS. I made some updates to the site, including a much simpler experience to contribute aka•ms links to the database.
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Sean Killeen @seankilleen.com · 22/08/2026
Grateful for my family, and grateful to be grateful for my family.
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Sean Killeen @seankilleen.com · 20/08/2026
Phenomenal article from @samwho.dev at @ngrok.com on #kubernetes probes ngrok.com/blog/probes With interactive visualizations! Really nicely done. I learned a ton.
ngrok.com
How Kubernetes probes work | ngrok blog
Learn how probes work interactively on simulated Kubernetes clusters running in your browser.
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Sean Killeen @seankilleen.com · 20/08/2026
@samwho.dev your article on kubernetes probes was phenomenal 🏆 thanks!
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Sean Killeen @seankilleen.com · 20/08/2026
@jeremydmiller.bsky.social I was at the zoo yesterday for a bit and naturally ended up explaining event sourcing to someone I was with. Thanks! 😆
A description sign at a zoo exhibit for the American Marten. The sign has descriptive text about the Marten and a picture of the animal. One of Jeremy's big projects is called Marten.
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Sean Killeen @seankilleen.com · 08/08/2026
Our yearly vacation has been a massive success for me personally. Going into it, I was hitting physical burnout and was sick for like a week straight. I've been sleeping better, reset my caffeine intake, and have only spent ~5 min on work stuff; apps have been archived almost the whole time.
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Sean Killeen @seankilleen.com · 30/07/2026
Nothing like a bot tagging in @vcsjones.dev on a runtime issue I filed to really bring it home that I am absolutely out of my depth 😅
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the Mountain Goats @themountaingoats.bsky.social · 25/07/2026
“food for thought” buddy my thoughts don’t need any food at all. been trying to starve them fuckers for years and they still keep doing the thing
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Sean Killeen @seankilleen.com · 23/07/2026
Just deleted the DoorDash account I've had since 2018. Messing with DC state rule over a 20 cent tax. The NERVE. #DeleteDoorDash
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Musicology Duck @musicologyduck.bsky.social · 23/07/2026
done and if you think a corporation shouldn't be able to goad congressional republicans into overruling laws a community makes for itself-- you can also #DeleteDoorDash and call your congresspeople about both this bill and the need for statehood
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Sean Killeen @seankilleen.com · 21/07/2026
Today was a really, really hard day. I am choosing to believe tomorrow will be better. If you had a really, really hard day, I hope tomorrow is better for you, too.
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Sean Killeen @seankilleen.com · 16/07/2026
Imagining Canada as a beekeeper Just pumping smoke down toward us, hoping it will calm us down and make us less aggressive
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Sean Killeen @seankilleen.com · 15/07/2026
I am in a support e-mail thread with UPS that I swear one day I will read, verbatim, as a standup act.
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Sean Killeen @seankilleen.com · 15/07/2026
Grateful and humbled to be renewed as an MS MVP. Will do my best to live up to the obligation this year! #mvpbuzz
A screenshot of an acceptance email with my renewal as a Microsoft MVP.
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Mayor Zohran Kwame Mamdani @mayor.nyc.gov · 14/07/2026
This morning in Biddeford, Maine, a 26-year-old man said goodbye to his wife and daughter and left for work. Moments later he was dead, shot in the head by ICE agents, the second man ICE has killed in six days. ICE is killing our neighbors. ICE cannot be reformed. Abolish ICE.
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Sean Killeen @seankilleen.com · 06/07/2026
1 year ago I ordered 32GB RAM. But because I missed that I had an old BIOS, I thought my motherboard couldn't support it. So I returned the RAM to get my $185 back. That same RAM is going for $1,090 today. Wow. (Talk about a lesson learned on my end! Costly oversight.)
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C. Robert Cargill @crobertcargill.bsky.social · 04/07/2026
A reminder that as you see photos of those Patriot Front douchebags today, they are marching on a holiday because none of them have anywhere else to be. None of them have friends or family who want them around on a holiday. No one is missing them today. They're already with their only friends.
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Sean Killeen @seankilleen.com · 03/07/2026
The planes flying low are disconcerting. Hard not to enjoy the spectacle of it, but also hard not to think of how our military is being used and not used these days.
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Sean Killeen @seankilleen.com · 02/07/2026
Had to write up a doc on our development approach / process and seeing it all in one place makes me so immensely proud. 5 products and all the associated infrastructure (cloud and non). 850 PRs so far this year. 1,100 tickets completed, 3 minute zero-downtime deployments all day long, (1/2)
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Sean Killeen @seankilleen.com · 18/06/2026
Anyone have a favorite #RDP client on #Android? I've got a phone and a tablet that sometimes need to get to a desktop. Tried the #Windows app but it doesn't scale the display, so the windows are all smushed to the point of being unusable. Willing to pay for a solid experience.
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Sean Killeen @seankilleen.com · 17/06/2026
I've been getting more marketing e-mails in my inbox with the subject "Reply Yes". It just dawned on me that I think this is a sort of "marketing supply chain attack" for tools using agentic AI to read/reply to e-mails. I hate it.
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Sean Killeen @seankilleen.com · 15/06/2026
Been a while since I was this happy to watch a storm roll in.
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Sean Killeen @seankilleen.com · 12/06/2026
Love when I'm trying to leave for the day and windows won't let me shut down until it processes windows updates 🙃
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Sean Killeen @seankilleen.com · 09/06/2026
My caffeine consumption has hit the level of the Barista saying "...this doesn't affect you?" ...might be time to cut back.
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Sean Killeen @seankilleen.com · 09/06/2026
Google has missed the mark so badly with its Google Health AI. I had a better experience literally copying and pasting raw data into Claude. How can your AI not beat that, *with* all my Fitbit data input? Shockingly terrible.
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Sean Killeen @seankilleen.com · 08/06/2026
Every day I've had to commute to this co-working space during our renovation, I've been grateful for work from home. My defensive driving is getting a *workout*.
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Veni Kunche @veni.dev · 03/06/2026
YNAB, TechCongress, American Journalism Project and the Contingent are hiring! Find more details in Diversify Tech's newsletter: newsletter.diversifytech.com/p/diversify-...
newsletter.diversifytech.com
Diversify Tech #390
Connecting underrepresented people in tech to career opportunities
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Sean Killeen @seankilleen.com · 03/06/2026
Just declined to engage with a large testing vendor in the SAP space based on how they treated a #dotnet #oss project in the past. We could have possibly spent a good deal of money with them, but orgs need to know that how they treat OSS directly impacts brand trust.
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