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jt2190

4,734 karma · joined October 1, 2009

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jt2190··on AI didn't erase the junior engineer's value, it increased it it
> This summer, we assigned the problem to an intern (that’s less tenure than a junior engineer). The intern led the development of this feature. They talked to the product manager to understand the problem and requirements. They wrote the design document on how to approach it, aligned with the team, and built it. Of course they did that with the help of AI, and the team they were working with.

So, interns can still produce some value. How much value?

> In our product, there was a feature which had been requested for years, but had not been built yet. It wasn’t overly complex, but it was not critical.

Said another way: The feature was of so little value that it was not even worth assigning to a non-AI-assisted intern! This is what most of us mean when we say “AI lowers the value of…”

jt2190··on Jane Street suffers $15B hit after meltdown at Situational Awareness
> Jane Street has generated more than USD 40 000 000 000 in net trading revenues in the year to Friday, even accounting for the July loss, which exceeds its entire haul for 2025, according to one of the people familiar with the matter.
jt2190··on License plate reader searches should require a warrant
I believe you’re trying to articulate the act of witnessing from the act of investigating, and where the boundary between the two is. To me it seems like the boundary should be “does the general public have access to this information?”. If so, it’s allowable. If not, then a justification should be required for starting an investigation.
jt2190··on To recruit teachers, school districts are building homes
Yeah sorry I was in a hurry. I’d originally vouched for your comment (it was dead/flagkilled), then threw up that link as a quick support for your numbers.
jt2190··on To recruit teachers, school districts are building homes
> the average is around $96,000

https://www.cps.edu/media/community-updates/2025/january/neg...

jt2190··on Romania Extends Nuclear Reactor Output by Nine Days After Danube Blasts
https://apnews.com/article/romania-europe-nuclear-danube-dro...
jt2190··on A year of fighting scrapers on my 1.5 million-page website
Yeah it's sort of weird that people are so used to using their computer to interact with other computers across the internet that the whole thing has become invisible to them: They completely forget that they're using a computer at all. Along come "bots" and suddenly everyone remembers that the whole thing involves computers. Driving the computer by hand for hours was never efficient, but is marginally entertaining I guess.
jt2190··on Where .env Went Wrong
> Why would it want to?

Because well behaved applications play nice with their host system.

I have a strong suspicion that you’re thinking about application configuration, not environment configuration.

jt2190··on Where .env Went Wrong
> Yes, the problem .env files try to solve is having "environment variables" be injectable from a file so that different applications can have different environment variables by default.

This seems like a misunderstanding: The `.env` file should be `source`d into the current shell (environment). The application reads values using whatever mechanism it uses to read these values from the environment. Nothing should be “injected” into the application, i.e. the application should not read `.env` directly.

(Not sure if you were just being loose with your terminology, trying to clarify.)

jt2190··on The Abandoned Fish Sauce Terrorizing a Small Canadian Town
https://www.cbc.ca/news/canada/newfoundland-labrador/st-mary...

tl;dr

After 20 years of legal battles abandoned factory containing tanks of rotting fish in St Mary’s NL is getting cleaned up, paid for by provincial taxpayers.

jt2190··on Big Food vs. the People
You repeating vague claims over and over is not clarifying your point at all.
jt2190··on Big Food vs. the People
It sounds like you’re proposing that individuals should have to pay court costs, in full so that the “taxpayer” doesn’t have to pay the bill
jt2190··on Big Food vs. the People
- “Purchasing”: The attorneys that are taking these cases for $0 in the hopes that they’ll get n% of $SETTLEMENT

- “paid for by tax payers who fund the court systems”. The alternative would mean taking away the right of private citizens to sue.

jt2190··on The Art of Decision-Making (2019)
This is an essay that discusses the following works:

- “Farsighted: How We Make the Decisions That Matter the Most” by Steven Johnson

- “Big Decisions: Opting, Converting, Drifting” by Edna Ullmann-Margalit (2006) https://www.cambridge.org/core/journals/royal-institute-of-p...

- “What You Can’t Expect When You’re Expecting” by L. A. Paul (2013)

- “Aspiration: The Agency of Becoming” by Agnes Callard

jt2190··on Shay Locomotives
I strongly suspect that they used oil, not grease, so they could flush the dirt out of the gears, and that this would have been done very frequently.
jt2190··on Brazilian farmers tokenized dairy cows to get loans, bypassing bank limits
There’s a credit agreement that will spell out those details:

> To turn cattle into trusted financial guarantees or collateral without requiring inspectors to visit the property, Cowmed equips cows with an AI-powered Smarty Collar. These collars constantly monitor health, behavior, and location. The raw data is then converted into an encrypted digital identity tied directly to the B3 credit agreement. [Emphasis mine]

jt2190··on Show HN: Read the Tape – Wordle for daytrading, five blind S&P 500 charts a day
It would find it clearer if:

- “up” and “down” was explained. If I bet “down” I’m betting my stock will underperform the monkey index? And if I am correct, I will make money (short the asset) or simply loose less than if I’d invested in monkey?

- loosing less money was green (win) when monkey is down even more.

jt2190··on That post never existed. Stop listening to that thing
That’s “Sysadmin work teaches you the value of stacks” from May 20, 2013. AI hallucinated a post named “The Stack” from August 19, 2013.
jt2190··on Heresy (2022]
Why did you leave out the “strong opinion” part?
jt2190··on Heresy (2022]
No because “strong opinions” mark you as “aggressively conventional”: Nobody can tell if your opinions are “weakly held”, and most people won’t try and find out.

Instead you need to find like-minded people who are willing to challenge their thinking.

jt2190··on Photos of items from families in different countries with different incomes
The housing market is highly dependent on the job market so no, it’s not “being fussy”, it’s “I need to live here so I can have a job and income”. Unless you’re suggesting that people should quit their jobs and go get that cheap house in the middle of nowhere?
jt2190··on SpaceX bond worth 10% less than issue price – heading for junk bond status
No, but I will bet you that QQQ will not loose 1.2% of its value due only to SpaceX going to $0.
jt2190··on SpaceX bond worth 10% less than issue price – heading for junk bond status
> There is a massive downside to premature inclusion of a stock that is initially overvalued

Define “massive”. SpaceX is only 1.2% of QQQ.

jt2190··on Agnes Callard’s theory of the uni-context
> … internet fame / personal branding.

Also known as “social proof”/“social credibility”, and it’s a common mistake to assume it has no value whatsoever.

jt2190··on Ask HN: What Are You Working On? (July 2026)
These don’t already exist?

https://cricketmedia.com/childrens-magazines

https://rangerrick.org/

jt2190··on Good Tools Are Invisible
> If people find vim, emacs, or whatever genuinely good and productive, I’m not going to criticize them for using it. People are most comfortable with what they know. But for the people I am discussing, that same familiarity blinds them to their tools’ flaws, and leads them to celebrate those flaws, flaunting them as games.
jt2190··on Good Tools Are Invisible
The article discuses that specific subset of users who are into puzzle solving, so we should ground this discussion around that point and not fall into the “tool x is good/bad” pointless debate.
jt2190··on Good Tools Are Invisible
> … discretionary friction; designers or product folks adding features or complexity.

This is far more precise. The article talks about this from the users side, how there is a class of user who enjoys learning all of these “extra” features, even though they ultimately provide less value than the core features.

>> If people find vim, emacs, or whatever genuinely good and productive, I’m not going to criticize them for using it. People are most comfortable with what they know. But for the people I am discussing, that same familiarity blinds them to their tools’ flaws, and leads them to celebrate those flaws, flaunting them as games.

jt2190··on Good Tools Are Invisible
> What baffles me is that so many people treat that friction—the effort of working around a tool’s limitations—as the “fun” part, and then advertise it as evidence that the tool is great.

I think it’s fine if that’s your hobby, but I agree that in a professional context one should be much more critical of their tools. Even asking “why do I need a tool for this at all?” will reveal shortcomings in processes, data structures or other tools that will reap much greater rewards if effort is put into fixing those instead of optimizing use of a quirky tool.

jt2190··on TypeScript 7
I would have called this “strictly typed” I think, not “strongly”. Maybe my terminology is off.
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