Christian Aranda

past: Staff PM @stripe (Platform Infra/DDoS/DevEx/Risk) current: AI driven friction discovery @flocksynthetics

[Christian Aranda @ChristianInProd]

Not sure why because it’s pretty simple, but I’m proud of the skill I built that lets Codex consult with ChatGPT 5.5 Pro while building. The results have been great. I hope someone finds this useful. I plan on sharing more in the future. https://t.co/Ecua8hZHOV

[Christian Aranda @ChristianInProd]

@GergelyOrosz Wow, I forgot about Parse! 🫗

[dominik kundel @dkundel]

@MatthewBerman Likewise! 🙌 here are my slides while you wait for the talk 😄 https://t.co/Xsw16J7RwT

[Christian Aranda @ChristianInProd]

@dkundel @MatthewBerman Hey Dominik, I’ve had the slides open in a tab since you posted this 😅

Did the video get posted? I can’t find it on YouTube. Thanks!

[Christian Aranda @ChristianInProd]

@petergostev @steipete Buddy I’ve got 6 resets across 2 accounts ready to go tomorrow. I’m all set.

[Christian Aranda @ChristianInProd]

@kseniam0s We built synthetic UX testing. Agents test your app like a human would. Sign up for the waitlist and respond here and I’ll get you in. https://t.co/iNrpWx62fR

[Christian Aranda @ChristianInProd]

@samlambert @VicVijayakumar At least you found a new question for the recruiter screen.

[Christian Aranda @ChristianInProd]

@ryanbrewer I used to do this but got scared away because I keep seeing research showing this has negative returns over time.

Maybe it’s time to try it again.

[Christian Aranda @ChristianInProd]

@l3d1c @imkikosuarez This is a great video but not for the reason he thinks. Look at the graph response from the touches in the video compared to the published “touch” from the Croatia game. Completely manipulated.

[Christian Aranda @ChristianInProd]

@Jason The answers to this are fascinating and skew towards people who live in metropolitan and suburban areas.

Drone deliveries to my rural area in 5 years, replacing Amazon? Unrealistic.

You’re missing a negative option. AI will increase consumption and the need for human drivers.

[Christian Aranda @ChristianInProd]

@jonahcelona @LachDarko It’s not a pressure sensor, it’s an accelerometer.

[Christian Aranda @ChristianInProd]

I’ve been driving my kid to U12/15 soccer for two years, and have watched about 10 games during WC so I know quite a bit about this.

What I’m most interested in though are all the “but there’s a chip!” responses. The chip is an accelerometer plus other tech. Was it right? 👇

[Josip @l3d1c]

🇭🇷 Croatia got eliminated from the World Cup by a closed-source sensor.

FIFA says the Kinexon chip in the Trionda "proved" Matanović touched the ball. Absolute disgrace. What actually happened: they ran signal processing over 500Hz IMU data from a 14-gram sensor and isolated a supposed contact spike from thousands of noisy samples dominated by bladder harmonics, panel flex, spin wobble and stadium micro-tremors, then nullified one of the most dramatic World Cup equalizers in history via spectral analysis of what is essentially glorified noise.

Oh, and it gets better. They moved the chip this year. Back in 2022, it used to hang suspended in the center of the ball. Now it's glued into the sidewall of ONE panel, with counterweights stuffed into the other three so the ball doesn't fly like a shopping cart. So sensitivity now depends on which side of the ball the "contact" happens relative to the sensor. Totally fine basis for ending a nation's tournament.

An IMU measures acceleration. Somewhere in a proprietary pipeline, a threshold decides which acceleration counts as "touch." That threshold is unpublished. The false positive rate is unpublished. The calibration data is unpublished. The patents are literally still in their secrecy window. And FIFA owns the raw data, so nobody can independently audit the trace that ended Modrić's last World Cup.

And we're all supposed to accept a "heartbeat graphic" on the broadcast as if that settles anything.

Since we sadly all know you won't ever admit your crimes or remove this technology for good, at least open source the detection pipeline, @FIFAcom!

Publish the thresholds, the error rates, the raw IMU trace from last night. If the tech is right, transparency costs nothing, right?

[Christian Aranda @ChristianInProd]

@l3d1c Nice work! I started down this path a bit and was hoping someone would go deep. We came to the same conclusion.

[Christian Aranda @ChristianInProd]

I’ve been driving my kid to U12/15 soccer for two years, and have watched about 10 games during WC so I know quite a bit about this.

What I’m most interested in though are all the “but there’s a chip!” responses. The chip is an accelerometer plus other tech. Was it right? 👇

[Christian Aranda @ChristianInProd]

@ivanfatovic @GoingParabolic That’s the point I want to get across. The accelerometers sense change in direction, not pressure. At least visually it appears there’s no change in direction. What exactly registered? More importantly, when?

[Christian Aranda @ChristianInProd]

@N9830G Thank you for the correction. I am sometimes redundant redundant 🙃

[Christian Aranda @ChristianInProd]

I’ve been driving my kid to U12/15 soccer for two years, and have watched about 10 games during WC so I know quite a bit about this.

What I’m most interested in though are all the “but there’s a chip!” responses. The chip is an accelerometer plus other tech. Was it right? 👇

[TimForAlI 🇬🇧🇺🇦🇮🇱🇬🇪 @timmyvoe]

I think Croatia has been robbed, I don't see where it touches him

[Christian Aranda @ChristianInProd]

@MAENoles @shhhbreslin I break down the stats I could find about the accelerometers here

[Christian Aranda @ChristianInProd]

I’ve been driving my kid to U12/15 soccer for two years, and have watched about 10 games during WC so I know quite a bit about this.

What I’m most interested in though are all the “but there’s a chip!” responses. The chip is an accelerometer plus other tech. Was it right? 👇

[Christian Aranda @ChristianInProd]

@ERPJon Quite possible! It underscores the need for data transparency. Open it all up so we can see what other points of contact measure and when.

[Christian Aranda @ChristianInProd]

@YanPeronn Worse than that. From what I can find, it’s accelerometers.

[Christian Aranda @ChristianInProd]

I’ve been driving my kid to U12/15 soccer for two years, and have watched about 10 games during WC so I know quite a bit about this.

What I’m most interested in though are all the “but there’s a chip!” responses. The chip is an accelerometer plus other tech. Was it right? 👇

[Christian Aranda @ChristianInProd]

@randomoneh Agreed. It’s a variant of appeal to authority.

[Christian Aranda @ChristianInProd]

@0xaiwa @OpulentVocation This is the question. I’m not so sure.

[Christian Aranda @ChristianInProd]

I’ve been driving my kid to U12/15 soccer for two years, and have watched about 10 games during WC so I know quite a bit about this.

What I’m most interested in though are all the “but there’s a chip!” responses. The chip is an accelerometer plus other tech. Was it right? 👇