Joaquim Rendeiro

I like creating stuff. Mostly software, but other stuff too.

[Joaquim Rendeiro @jqrd]

Are mentions like @[email protected] still blocked over here?
Are you moving over?
I still use both, but what I get out of each one is quite different!

[Joaquim Rendeiro @jqrd]

@SemiAnalysis_ Would be great to also do the comparison using a 3rd party harness, to have an idea of how much the harness itself contributes to the “exchange rate” / efficiency. Stick those API keys in OpenCode and run it, pretty please :)

[Jason Walls @walls_jason1]

Yesterday Mark Cuban reposted my work, DM'd me, and told me to keep telling my story.

So here it is.

I'm a Master Electrician. IBEW Local 369. 15 years pulling wire in Kentucky. Zero coding background. I didn't go to Stanford. I went to trade school.

Every week I'd show up to a home where someone just bought a Tesla or a Rivian. And every time, someone had already told them they needed a $3,000-$5,000 panel upgrade to install a charger.

70% of the time? They didn't need it.

The math is in the NEC — Section 220.82. Load calculations. But nobody was doing them for homeowners. Electricians upsell. Dealers don't know. And the homeowner just pays.

I got angry enough to build something about it.

I found @claudeai. No coding experience. I just started talking to it like I'd explain a job to an apprentice. "Here's how load calcs work. Here's the NEC code. Now help me build a tool that does this."

6 months later — @ChargeRight is live. Real software. Stripe payments. PDF reports. NEC 220.82 calculations automated. $12.99 instead of a $500 truck roll.

I'm still pulling wire. I still take service calls. I wake up at 5:05 AM for work.

But something shifted.

Yesterday @vivilinsv published my story as Claude Builder Spotlight #1. Mark Cuban saw it. The Claude community showed up. And for the first time, I felt like this thing I built in my kitchen might actually matter.

I'm not a tech founder. I'm a dad who wants to coach little league and be home for dinner. I just happened to build something that helps people.

If you're in the trades and thinking about using AI — do it. The barrier isn't technical skill. It's believing you're allowed to try.

https://t.co/cDVdY5mcLv

[Joaquim Rendeiro @jqrd]

@SydneyLWatson Academic performance also correlates with how much older a kid is than their year group.... go figure

[Joaquim Rendeiro @jqrd]

@strzibnyj @trendradar_app You might enjoy Microsoft's Sculpt keyboard. Or go wild and go for a ZSA Moonlander for the full split :)

[Joaquim Rendeiro @jqrd]

@GergelyOrosz I started at Microsoft as an SDET, moved to SDE and a year later or so the merge of roles happened.
In my teams there was never any doubt about who owned writing UTs -- SDEs.
Before SDETs there were STEs.
Shipping cadence didn't change immediately as part of the role merge.

[Joaquim Rendeiro @jqrd]

@nayibbukele Misleading question. Ask about the head of state term limits.
In most European countries the head of state is not the head of government, thus they are not susceptible to falling into dictatorship.

[Joaquim Rendeiro @jqrd]

@sallepierrelamy @Acyn @AOC You mean other than "how did I do that?" He's clueless.

[Joaquim Rendeiro @jqrd]

Did i just enjoy that 20 min Apple ad with Stormzy? Yes I did.

[Joaquim Rendeiro @jqrd]

@raoulsnotes The revert mentioned might explain why our previous deploy from over 24h earlier got somehow replayed and dynos started "gracefully shutting down" one by one without coming back up, which caused us 1h of downtime, towards the end of their outage.

[Joaquim Rendeiro @jqrd]

@SergioRocks Overly commented code.

[Joaquim Rendeiro @jqrd]

@thdxr Misdirection. The real reason people (middle class and working class) are getting poorer? Look up Gary Stevenson on YouTube.

[tsilva @tiagosilva]

We're in 2025 and I accidentally made `claude-3.5-sonnet` dump his system prompt. -- https://t.co/4EQ5HdBEWi

[Joaquim Rendeiro @jqrd]

@awilkinson The only thing that comes to mind is the Mochary Method. Hire one (or more) "chiefs of staff" (not EAs!) that you'll eventually trust to almost autonomously run subsets of your portfolio. Add checks & balances.
PS: I haven't had this problem myself! https://t.co/TJVUQwXFTx

[Joaquim Rendeiro @jqrd]

I have been passionate about dotnet since 1.1. But these days, I'd advise people to invest in learning Go and Javascript/Typescript instead. That's where I see the most option value is. 3/3

[Joaquim Rendeiro @jqrd]

And here is one of the main hurdles of dotnet. It's been cross platform for ages, both development and runtime. You can get extremely far without needing to open Visual Studio. You can deploy on Linux. Managed SQL server is more expensive but you can use any DB. 1/

[Gergely Orosz @GergelyOrosz]

My sense is that as a startup:

1. You either push your devs to use Windows; pay upfront for licenses (or apply for an MS grant); hire for "MS devs" (often working in the enterprise)

2. OR say "we're a startup, we use cutting-edge open source stuff. You get the latest Macbook"

[Joaquim Rendeiro @jqrd]

But because of the self reinforcing negative loop, it's hard to attract the same talent to the dotnet world. I've seen from the inside how amazingly talented people at Microsoft are with dotnet. Even more impressed with the boundaries Unity continues to push. 2/

[Compounding Quality @QCompounding]

Daniel Kahneman passed away today

He changed the world of behavioral finance

Here are 10 things I learned from his book Thinking Fast and Slow as a way to say thank you:

[Sergio Pereira @SergioRocks]

What now folks?

[Joaquim Rendeiro @jqrd]

Amazing project and definitely the best demo ever!
https://t.co/RmuiInxKIz