
Qubicle | Based Dept. Treasury 🏦
10.2K posts

Qubicle | Based Dept. Treasury 🏦
@cubeqube
29👨💻principal cloud/software/devsecops architect in cybersec ind.🛡️🇺🇸 🏦 100% LONG $OPEN 🏡


Tesla



Jane Street made ~$40B in 2025 with 3,500 employees, a ~2x from the year before. At ~65-70% profit margin, that's $8M profit / employee, the highest for a 1000+ ppl company. High-frequency trading continues to be the most efficient money making engine. I want to share an old story about my Jane Street interview in 2014. Jane Street was known for hiring a lot of math, physics and CS olympiad winners from top universities and putting them through many rounds - including, for trading roles, a gauntlet of mental math. It was my 6th interview and my final round and I recall being asked "What is the next day after today in DD/MM/YYYY where all the digits are unique?" They'd toy with you and say "You can use a pencil and paper, if you want" but you knew that was an instant no. Painstakingly and as quickly as I could, I came to an answer. "How confident are you that this is correct on a 0-1 probability scale?" the interviewer said. "0.95", I blurted out, not fully knowing how to answer that. "Are you sure?" After thinking harder for a few more seconds, I realized I could've flipped the digits around to get a closer date. I gave the interviewer my answer. It was correct. "0.95 huh?" he chuckled. That's when I knew I failed. Note: fwiw, other companies that come close in efficiency are - Tether ($90M+ profit/emp) - Hyperliquid ($80M+ profit/emp) and on revenue: - Valve ($50M/emp) - OnlyFans ($37M/emp) - Craigslist ($14M/emp) - Anthropic ($12M/emp, run rate) - OpenAI ($8M/emp, run rate) For comparison, Nvidia is very efficient at scale and is $4.4M/emp.



Hey @Hacker0x01 super disappointed. Reported a critical bug on a private program: full access to 73 storage containers, (RCE) entire company's candidate PII downloadable. Triaged valid. Fixed by the team (confirmed). Then 2 months later closed as N/A "third-party SDK issue." If the key is served from your domain, leaking your users' PII, and your team fixes it how is that N/A? Filed mediation but 6–7 months is a long wait. Can someone from the team take a look? Bug is genuinely worth your time.

if you've ever used Reframe to get sober, your private journals, your craving logs, what triggered you, how bad it got, your name, your email, all of it is sitting in a database that anyone can read without logging in i unzipped the app and found a database key in a config file. thats it. thats all it took 357,939 users exposed. disclosed april 7, no response










Come join our mission to tilt the world in favor of homeowners. We are growing our operations team in Toronto. opendoor.com/careers/open-p…

















