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David Cox Profile
David Cox

@davidcox

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469
Following
3K
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69
Statuses
374

Founder & CEO @IntegrateReason (YC S22, TechCrunch Biggest Moonshots) | Cited by Google DeepMind, Meta AI | ex Apple, my code runs 250B times / day

San Diego, CA
Joined December 2022
Don't wanna be here? Send us removal request.
@davidcox
David Cox
6 months
spent 3 hours on the application + 10 min interview. yc is life changing and doesn't end after the batch
@nizzyabi
nizzy
6 months
it took 1 application for us to get into yc
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@davidcox
David Cox
4 days
biggest nix news of 2025 LFG!
@grhmc
Graham Christensen
4 days
lol: Determinate Nix's is cutting Nixpkgs tarball cache import time from 40s to 4s in the next release.
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@davidcox
David Cox
6 days
if you’re using nix but not flakes please explain. genuinely curious why.
@grhmc
Graham Christensen
6 days
@oeiuwq @DeterminateSys My data shows that basically *all* new user growth with Nix is with users choosing flakes. That flakes alone are responsible for making Nix much more approachable and understandable. [...]
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@davidcox
David Cox
15 days
nix obviously
@LukasHozda
Lukáš Hozda
15 days
Programmers of which language exhibit the most signs of being in a cult?
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@davidcox
David Cox
16 days
gm bro want to borrow my telescope?
@hiddnest
Chanhee
16 days
gm
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@davidcox
David Cox
16 days
well this is awkward
@_Rixchy
Richmond
16 days
Had @theo as my top Channel.
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@davidcox
David Cox
17 days
we’re building the world’s fastest linear programming solver using this beautiful behemoth. shipping this month!
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@davidcox
David Cox
17 days
I’ve generated 50k+ lines of Cubical Agda with Claude Code and am skeptical of products like this as a result. LLMs cheat when they get stuck and even if you ban unsafe features like postulates they still find ways, some of which are not machine checkable. Proofs that are
@CarinaLHong
Carina Hong
17 days
Axiom sets out to build an AI mathematician. We are the underdog. 4 months old, 2 years late to the game, under 10 FTEs (recently grew to 17), and had 1:5 in funding and in valuation to our competitor. Today, AxiomProver solved Erdos Problems #124 and #481 in Lean, a 100%
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@davidcox
David Cox
18 days
nix fixes this
@mholt6
🧗‍♂️ Matt Holt
18 days
I'm reinstalling Arch, so I clicked on a mirror to download it, and... well I'll be.
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@davidcox
David Cox
18 days
no “black friday deal”here: short ~$150k (12.5k shares) max gain $150k loss unlimited +20% rally = $30k loss buyout at $30 = $225k loss huge path risk! bro is cooked. should have bought: jun ‘26 12.50 puts ~$1.98 $150k = ~750 contracts max gain ~$790k (PD→0) max loss $150k
@jjrichardtang
JJ Tang (Rootly)
19 days
This morning I put $150,000 of our personal savings into a short position on PagerDuty. Since their latest earnings, the stock has been in free fall — down more than 25% this month and over 75% from 2021 highs. It’s the most obvious “Black Friday deal” in the market right now.
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@davidcox
David Cox
18 days
DataFjord DataEstuary DataAlluvialFan DataLoogie DataIcedLatte
@georgecurtiss
George
18 days
DataOcean DataLake DataRiver DataPond DataPuddle
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@davidcox
David Cox
18 days
who else is weaponized about nix and attending re:invent? @RossComputerGuy @grhmc
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@davidcox
David Cox
2 months
so amped about these!
@stopachka
Stopa
2 months
Got the test prints!
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@davidcox
David Cox
2 months
true. we got married during YC and are crushing it
@nizzyabi
nizzy
2 months
married founders do better
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@davidcox
David Cox
3 months
rip @theo’s mac
@grhmc
Graham Christensen
3 months
byeeeeeee
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@davidcox
David Cox
3 months
get more sleep @aidenybai
@davidcox
David Cox
11 months
@aidenybai You’re probably missing out on deep sleep. According to my @eightsleep (YC deal) if I go to bed any later than about 12:30 it cuts into my deep sleep almost 1:1. Going to bed “on time” is more important than hours asleep IMO. Try 11pm sharp - 7am for a week
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@davidcox
David Cox
3 months
i think about this all the time
@MemesOfNixOS
NixOS Meme Lord
8 months
If only there was a package manager which worked on linux and darwin, and didn't affect the host system. Not to mention it's the largest repository in the world
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@davidcox
David Cox
3 months
Nix is about to get so much better. Tristan is truly gifted and is going to absolutely cook at Det Sys. If you’re not using Nix, you will be soon.
@RossComputerGuy
Tristan Ross 😺❄️
3 months
I recently joined @DeterminateSys, glad to be back in a tech job after almost 3 years.
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@NathanFlurry
Nathan Flurry 🔩
3 months
We never intentionally degrade meme quality as a result of demand or other factors.
@davidcox
David Cox
3 months
@NathanFlurry @coleywoleyyy nathan is quantized to 1.58 bits 9-5 m-f
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@davidcox
David Cox
3 months
“how does a company worth TENS OF BILLIONS of dollars not notice a bug for 3 weeks? explain that. it doesn't add up.” happens all the time. if I had a dollar for every bug report I’ve seen incorrectly closed as “not enough evidence, cannot reproduce” i’d have like $500.
@CtrlAltDwayne
Dwayne
3 months
@claudeai not good enough. for 3 weeks customers have been complaining about performance issues with claude code and you only just noticed? it's funny how these bugs seem to coincide with the august 28 usage limits, huh? and when you did finally acknowledge there was a "bug" you don't
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@davidcox
David Cox
3 months
I’m seeing tons of posts about it and have also experienced the “quality issues”. Their use of the phrase “found and fixed” implies that the quantization isn’t (wasn’t?) deliberate. Should we believe them? 🤔
@theo
Theo - t3.gg
3 months
Kind of crazy that Claude models have had crazy quality issues nonstop for like 3 weeks now and...nobody's talking about it?
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