Jay Tennier (@jaytennier) header
Jay Tennier (@jaytennier) profile picture

Jay Tennier

@jaytennier

It's pronounced `ten-yay. @jaytennier@jawns.club @jaytennier.bsky.social

 Niagara-on-the-Lake ON Canada
supergenius.ca
Joined June 2008
  • Tweets22.3K
  • Following298
  • Followers433
1KMedia
Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)Photo by Jay Tennier (@jaytennier)
Jay Tennier retweeted
Tom Cardy (@Tomycardy) profile picture
Tom Cardy@TomycardyFeb 25
I love #therapy
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Jay Tennier retweeted
Jan Grodowski (@mrgrodo) profile picture
Jan Grodowski@mrgrodoFeb 4
"Absolutely essential for ensuring our AI agent-written PRs have the coverage we require." This is why I build tools, thanks for the shoutout @jaytennier bsky.app/profile/jaytennier.…
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One of the strangest marketing videos I’ve ever seen. Everything about the staging makes it seem like it’s supposed to be positive and inspiring but it’s a guy saying the company has a serious problem which he does not believe can be solved
OpenAI (@OpenAI) profile pictureOpenAI
@OpenAI17 Dec 2025
Compute enabled our first image generation launch (and a +32% jump in WAU over the following weeks) as well as our latest image generation launch yesterday. We have a lot more coming… and need a lot more compute.
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You can tell it’s a real landmark commitment by how it’s just a screenshot of a website with no actual details.
Mark Carney (@MarkJCarney) profile pictureMark Carney
@MarkJCarney9 Dec 2025
We welcome Microsoft's landmark $19 billion investment in Al Infrastructure in Canada.   Microsoft's commitment will create high-paying careers, build Canada's innovation ecosystem, and empower our researchers and businesses to compete globally. Canada's new government is securing massive opportunities for Canada's workers and business — partnerships that are building a stronger, more independent, and prosperous Canada.
A screenshot from the Microsoft website with text that reads: Microsoft Deepens Its Commitment to Canada with Landmark $19B AI Investment.

ALT A screenshot from the Microsoft website with text that reads: Microsoft Deepens Its Commitment to Canada with Landmark $19B AI Investment.

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This was such a great conversation with Robby and I can’t believe we managed to cover so much (he was even kind enough to let me get up on my soapbox for a bit and complain about DRY tests and why you should always write adapter classes 😄) Really hope I get to do it again!
Robby Russell (@robbyrussell) profile pictureRobby Russell
@robbyrussell9 Dec 2025
Had a chance to dig in with @rainforestqa's @jaytennier about what it really takes to keep a long-lived Rails monolith thriving with a small team.
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Jay Tennier retweeted
Ruby on Rails (@rails) profile picture
Ruby on Rails
@rails9 Dec 2025
In the newest episode of On Rails, @robbyrussell speaks with @jaytennier, Engineering Manager at @rainforestqa, about maintaining a long-lived Rails monolith with a small team, why Rainforest pulled microservices back in, how they use adapters for third-party services, and why BigQuery handles their analytics load. Jay also shares their testing philosophy (“wet tests” > DRY), using dry-monads for complex flows, and how celebrating code deletion became part of their culture. Listen to the full episode here, or wherever you get your podcasts: buzzsprout.com/2462975/episo…
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When @OpenAI said they wanted to send me a token of their appreciation I thought it was going to be a t-shirt 😄 This is way cooler (and heavier)
An award from OpenAI to Rainforest QA for using over 10 billion tokens. Includes a description of the award: We launched this project to recognize the real-world change our users on the OpenAl Platform are making, and the milestones you've reached along the way. You've used a lot of API tokens so far, so we looked at different ways to represent the idea of a token in the physical world. You are holding the result: anodized aluminum mounted in a frosted transparent resin designed to catch and diffuse the light, illuminating this major moment and reflecting our bright future together. A piece to display with pride, bound to generate conversation.

ALT An award from OpenAI to Rainforest QA for using over 10 billion tokens. Includes a description of the award: We launched this project to recognize the real-world change our users on the OpenAl Platform are making, and the milestones you've reached along the way. You've used a lot of API tokens so far, so we looked at different ways to represent the idea of a token in the physical world. You are holding the result: anodized aluminum mounted in a frosted transparent resin designed to catch and diffuse the light, illuminating this major moment and reflecting our bright future together. A piece to display with pride, bound to generate conversation.

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Jay Tennier retweeted
Jan Grodowski (@mrgrodo) profile picture
Jan Grodowski@mrgrodo23 Sep 2025
And lastly, massive performance improvements for analysing large pull requests. And a Pro plan (279/mo) suitable for large teams with thousands of PRs per month. No changes to open source - Undercover CI remains free to use for public repositories. LFG! 🚀
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Jay Tennier retweeted
Jan Grodowski (@mrgrodo) profile picture
Jan Grodowski@mrgrodo23 Sep 2025
2025 has brought significant development to both Undercover CI and the undercover gem currently at 0.8.0. Thanks for the feedback and please keep it coming. Here are a few noteworthy changes 🧵
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It’d be a real shame if Shai’s private admission that he lost his Columbia job over a harassment investigation got more views than his dossier of smears against the women who accused him. Doesn’t exactly pair well with his Tablet story about his triumphant exit.
Image from jasper nathaniel (@infinite_jaz)
Image from jasper nathaniel (@infinite_jaz)
Shai Davidai (@ShaiDavidai) profile pictureShai Davidai
@ShaiDavidai17 Aug 2025
Replying to @infinite_jaz @rosen77
I actually applaud Jasper. He helped my post about Mahmoud Khalil get to more than 1,000,000 people!
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“You may get a Starbucks cup of coffee from a drone” *loads net gun* You’re goddamn right I will
More Perfect Union (@MorePerfectUS) profile pictureMore Perfect Union
@MorePerfectUS6 Aug 2025
The FAA will now let commercial drones fly beyond the operator’s line of sight. The move will "unleash American drone dominance," Transportation Secretary Sean Duffy said. As a result, Duffy said, " You may get a Starbucks cup of coffee from a drone."
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GQ has been publishing really good writing lately. Would totally write for them given the chance gq-magazine.co.uk/article/hu…
AI is destroying hustle culture

AI is destroying hustle culture

Grindset podcasts, 4am wakeups, dubious supplements – after taking over the world, the grift finally seems to be slowing down. Why hustle when ChatGPT can hustle for you?

gq-magazine.co.uk
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Better stand right in front of the boarding line in case they start with zone 11 this time.
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Image from Van Jackson (@RealVanJackson)
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I would strongly encourage the media reporters I know to investigate the decision-making that went into the publication of this story.
Sam Adler-Bell (@SamAdlerBell) profile pictureSam Adler-Bell
@SamAdlerBell4 Jul 2025
"all the news that's fit to print" aka story about how a guy from Africa who is Asian said so on his college app to a college where his dad worked, and to which he did not get in — sourced to an anonymous right-wing race realist. This is fucked nytimes.com/2025/07/03/nyreg…
Mamdani Identified as Asian and African American on College Application (Published 2025)

Mamdani Identified as Asian and African American on College Application (Published 2025)

Zohran Mamdani, the Democrat running for mayor of New York City, was born in Uganda. He doesn’t consider himself Black but said the application didn’t allow for the complexity of his background.

nytimes.com
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Infant Annihilator Change Name to Avoid Association with Israel thehardtimes.net/music/infan…
Infant Annihilator Change Name to Avoid Association with Israel

Infant Annihilator Change Name to Avoid Association with Israel

HULL, U.K. — Extreme metal provocateurs Infant Annihilator are changing their name in an effort to minimize any association with the State... Continue reading this gem

thehardtimes.net
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Jay Tennier retweeted
Kim Kelly (@GrimKim) profile picture
Kim Kelly@GrimKim4 Jul 2025
LABOR LOVES COOL JAMES! inquirer.com/news/ll-cool-j-…
Headline: LL Cool J pulls out of Wawa Welcome America “I’m not gonna cross a picket line and perform for money when people are hurting,” the rapper said on Instagram and X.” Underneath, there is a photo of LL Cool J performing in a black muscle tee and black cap

ALT Headline: LL Cool J pulls out of Wawa Welcome America “I’m not gonna cross a picket line and perform for money when people are hurting,” the rapper said on Instagram and X.” Underneath, there is a photo of LL Cool J performing in a black muscle tee and black cap

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Jay Tennier retweeted
Greg Molnar (@GregMolnar) profile picture
Greg Molnar
@GregMolnar24 Jun 2025
The "s" in LLM stands for security.
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The "aid distribution centers" are traps. Attract starving Palestinians to them and then murder them. Can there be anything more evil than this American-Israeli scheme, backed by @EUinIsrael complicity and Arab regime vassalage and treachery?
Gaza Notifications (@gazanotice) profile pictureGaza Notifications
@gazanotice1 Jun 2025
🚨BREAKING: Israeli forces opened fire on thousands of starving Palestinians on their way to receive aid from the U.S. distribution center in the Netzarim Corridor, central Gaza. In western Rafah, southern Gaza, over 40 people were killed and at least 150 injured in the other deadly attack.
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BIDEN: (barely above a whisper) All he wants to talk about is Fat of the Land. Well there are other Prodigy albums. That one from 2004. I don’t remember the name. What’s that song. Spitfire, that’s a good— my time is up. TRUMP: I’m a firestarter. Twisted firestarter
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