Jonah Back @jonahback
engineer and explorer - starting something new Los Gatos, CA Joined September 2009-
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@endingepidemic @GMN_watch Let’s just say $OPEN continues to be my largest non-SPY position ;)
@RealOpenArmy @GMN_watch Nope. Bringing AI to the community in the US that is the most underserved by it - real small businesses.
One of the biggest unfair advantages for startups right now imo - they get an absurd amount of subsidy on Claude Code (probably Codex too). Big companies are paying per token because managing 100s of Claude Max subs isn’t a thing.
When you’ve been holding the laptop open too much to let Claude do its thing
Crazy to hear so many public companies claim they're ahead on AI. Paraphrasing earnings from earlier today - "we're the defacto choice for legal services w/ ChatGPT" reality....
Lots of engineers think AI codegen is only good enough to do little bug fixes here and there If you tell them you can ship 15k LOC of ai gen code to prod they think you have lost your mind. It’s so so early. And also those engineers are living in 2025.
I’m not exaggerating, I hear from so many big software cos which don’t use Claude Code/Codex. CTOs are asleep at the wheel. Engineers are typing code by hand. Fixing a bug a day. Like it’s 2024. If youre at these cos, demand change or leave. Now. You’re in for a rude awakening.
It’s time to build in San Francisco again
WSJ today on the San Francisco real estate market Pretty good summary what’s going on, and it’s not overly complicated: “An uptick in demand coupled with the city’s notorious lack of housing supply means that fierce bidding wars are breaking out again for single-family homes
Excited to be a part of this journey with the Deeptrace team - killer team and killer product
Excited to share that @deeptraceai has raised $5M to identify and fix every alert in production. This round is co-led by @felicis and @matrix, with participation from @ycombinator. As AI generates more of the world’s code, the real leverage shifts to systems that help engineers
The cruelest thing you can do to an engineer is require them to use AI to code and at the same time restrict them to using crappy models and tools. I understand why it happens but would be so frustrating.
Amazon had four Sev-1 outages (their highest severity level) in a single week. Internal memos say AI-assisted code changes were a contributing factor. The timeline here is wild. In October 2025, Amazon laid off 14,000 corporate employees. In January 2026, another 16,000. That’s
Sort of telling with buyback authorizations re: how companies think of their future. In a world where every pure SaaS company is at an all time high disruption risk, you’d think that money might be better spent on creating AI native experiences #AtomsNotBits
Most data teams are still building dashboards nobody looks at. We killed 1,400 of ours. Replaced them with a semantic layer you can talk to. Built custom AI tooling that replaced SaaS we were paying six figures a year for. Every person on this @Opendoor data team has unlimited tokens and AI agents running alongside them daily. Real estate is the largest asset class on earth and the transaction still feels like 1997. That's the data problem we wake up to. Pricing millions of homes. Optimizing tens of millions in ad spend. Building models that move real dollars, not slide decks. Our CEO's (@nejatian) mandate is "default to AI." Not a slogan. How we actually operate. Opendoor might be the most AI-native public company you haven't been paying attention to. Small team. Absurd talent density. Embedded across the entire C-suite. You touch pricing, marketing, product, sales, operations — all of it! We're hiring across Agentic Analytics Engineering and Data Science. Seattle or Toronto. If this is the kind of data team you've been looking for, stop scrolling and apply: Agentic Analytics Engineering: grnh.se/mqzo4ab46us Data Science: grnh.se/awisi8t36us
rly excited 4 this one!
We just went live in production on a new feature. It was a busy day but nothing feels as good as shipping products.
Last shirt said "Faster." Sneak peek at what this one says. Limited drop at openarmy.com now powered by @shop. Don't miss Q4 Financial Open House tomorrow 2/19 at 2pm PT on X, Robinhood, and YouTube. investor.opendoor.com
@maelan_sdmr Beyond time savings (which is definitely a secondary benefit), the main thing is iteration and learning speed. When things are fast and inexpensive you can change them often. When they are slow and expensive you don’t want to touch them.
One of the most underrated things about AI driven automation. Mistakes are easy to fix. We had a bug in our assessment process yesterday. 3 months ago, that would’ve meant 2am pages, lot of overtime and delayed offers. Today we basically just hit ‘retry’ after a fix.
For anyone in a software engineering leadership/management position, this is the time to see if you can figure out how to shelve that responsibility for a while and return to being a full time IC. Software engineering has changed more in the last few months than it has in the previous decade. The skills, experience, and perspective that you built to get you to the leadership/management position you're in now are becoming irrelevant extremely rapidly. If you are not able to adapt right now, you are going to start becoming bad at your job very soon, if you have not already. You're trusted to lead because you built the skills and judgement over time direct the boat confidently. But the boat that you were driving has suddenly been replaced by a completely different boat which you have never worked on before, so it's time to shift down and re-build your expertise before taking the helm again. 🫡
@Ryan_G_Lambert @Opendoor Definitely not pioneers here - I’ve long been inspired by Stripe’s try at BYOT stripe.com/blog/bring-you…
We’re doing a fun thing @Opendoor a lot more recently. Instead of beleaguering folks - esp founders - with typical tech interview loops, we’re just building in person together. 2 weeks of side by side crafting, focusing on delivering customer value.
Cassie Divine @divinecassie
2K Followers 995 Following Biz leader @Intuit, self-employed & small biz champion, @etsy entrepreneur, poser Martha Stewart, tooth fairy. Listen for loud laugh! she/her
Akuity @akuityio
1K Followers 95 Following Deploy with Argo CD, promote seamlessly with Kargo, and gain real-time visibility into your infrastructure with AI insights and dashboards
Charles Yoo-Naut (�... @cnaut
5K Followers 2K Following co-founder @raincards - building the blockchain-based card issuing and stablecoin interoperability platform
Hong Wang @wanghong230
180 Followers 79 Following Founder at https://t.co/UCBKv3oF83 - Supercharge your Kubernetes cluster with Argo || Former Argo Team Manager || Former Kubernetes Guy at Intuit
Michelle kirby @Michelleki7abq2
4 Followers 252 Following Protect ur XRP, move assets off exchanges like Binance, Coinbase, Kraken, Robinhood etc... Self custody matters. Message me "XRP GUIDE" for private guidance.
Nancy W @Bekir69146141
11 Followers 716 Following soft thoughts, strong mutual game 💕 follow back always
Nick @Nick75006977
314 Followers 2K Following
Ieldur @ieldur
465 Followers 292 Following La Hipocresia el gran problema de hui en dia. Matalafer🔴⚪.
pupska @pupska
102 Followers 281 Following
Ben Hong @BenHong79447396
15 Followers 112 Following
Dominic @Dominic1926
290 Followers 2K Following
Mike Moves @MikeMoves_CCP
853 Followers 5K Following ▫️Founder | SilverSpoon Ai ▫️ Investor | Carr Capital Partners ▫️ΑΦΑ ΔN ▫️Former Mainframe Systems Engineer at @Broadcom, @Fidelity, @McMasterCarr, and more
Scott Schmugar @SchmugarScott
74 Followers 2K Following
Ricardo Sáez @rsaezn
284 Followers 1K Following Periodista, cuarto de cinco hermanos, papá de la niña más linda del universo. Trabajando por la Educación TP. Piscola + 🍷 + Asado. Cuenta personal.
Cynthiagdennis @cynthiagde42101
31 Followers 619 Following
Dan Schenk @schenk_dan21342
1 Followers 26 Following
Bai, Xiaojun @oriental_ghhost
208 Followers 1K Following 白银和黄金投资、金融、摄影、艺术、健身、旅游 Silver/Gold, CEO of investment, DVE for Movie production.
John From Toronto @johnsplaining
87 Followers 734 Following Twitter is for fun. I don't take this too seriously. You shouldn't either
Nicole Matyszczyk @Annie520love
201 Followers 508 Following I don't follow the crowd, nor do I deliberately try to be different I think independently, make my own choices, and dare to take responsibility for my own lif
돈농사벼농사 @lawy_earn
486 Followers 605 Following 돈농사 짓는 변호사입니다. 낮에는 변호사, 밤에는 서학개미 $PLTR $OPEN $HIMS $ZETA 투자중 남편 셔터맨 만들기 프로젝트 중
ImprestAI @ImprestAi
0 Followers 3 Following
Shi Min @ReneeWebbc
169 Followers 401 Following Her confidence is a crown, worn not to demand attention, but to express her own truth
Dmitry Turmyshev @turmyshevd
215 Followers 599 Following Building https://t.co/HBJWTdrlUP Runtime verification for AI-assisted code changes | Trace-based JUnit regression Java/SpringBoot/Kotlin
Peet van der Slot @PeetvdSlot
67 Followers 175 Following
Steph MKT @SKimmsm98
746 Followers 3K Following Member of Mining Mafia, meme stock investor, small cap trader
Donny $OPEN @DonnyOpen
79 Followers 1K Following
Chad @sben_sbeve
110 Followers 426 Following
Men @Men57432939
11 Followers 305 Following
Chintan Parikh @chintanparikh94
1K Followers 2K Following building something new (yc f25). prev @secureframe @opendoor, @georgiatech, @teamcappio. @seedfeedteam, @startupXchange
StockOptionsMaster @shafeia
2K Followers 4K Following Former CFO. 30 Years Experience trading stocks & Options. Daily recommendations. NFA
Jicxer @Jicxer
4 Followers 57 Following
shortcake @shortcakes1188
16 Followers 204 Following
Katniss Everdeen @Katniss_2012
567 Followers 1K Following
Return Raptor @returnraptor
43 Followers 134 Following 🦖 Hunting AI, quantum & defense stocks before the crowd. NFA.
Siva @siva8159
9 Followers 92 Following
Alan Duvall @FamousAlan
17K Followers 8K Following Co-Founder https://t.co/83se4Ha3SR - We scale YouTube ,Facebook, and Google Ads. Angel investor and public markets investor
Kaan Durmus @kaandurmus564
21 Followers 137 Following
Tuffy @Mongndduri
179 Followers 913 Following Skin in the game. Soul in the game. All for the win 🏆 Company, Employees, Customers & Shareholder DMs open. No whiners Not financial advice
Stonkspekulant1 @stonkspekulant1
429 Followers 91 Following Calling in useful information. Tracking $OPEN through data. Proud shareholder & member of OpenArmy.
Vance Spencer @pythianism
162K Followers 9K Following Co-founder @hiframework. Tweets not financial advice. Views my own. May have assets in positions discussed.
W @idkagoodxname
23 Followers 156 Following
argoproj @argoproj
22K Followers 27 Following Argo is the premier open source GitOps and MLOps CNCF project
Cassie Divine @divinecassie
2K Followers 995 Following Biz leader @Intuit, self-employed & small biz champion, @etsy entrepreneur, poser Martha Stewart, tooth fairy. Listen for loud laugh! she/her
Akuity @akuityio
1K Followers 95 Following Deploy with Argo CD, promote seamlessly with Kargo, and gain real-time visibility into your infrastructure with AI insights and dashboards
Charles Yoo-Naut (�... @cnaut
5K Followers 2K Following co-founder @raincards - building the blockchain-based card issuing and stablecoin interoperability platform
Hong Wang @wanghong230
180 Followers 79 Following Founder at https://t.co/UCBKv3oF83 - Supercharge your Kubernetes cluster with Argo || Former Argo Team Manager || Former Kubernetes Guy at Intuit
University of Cincinn... @uofcincy
95K Followers 1K Following Bearcats don’t wait for what’s next — we create it. With top-ranked co-op, R1 research, and real-world impact, #NextLivesHere.
Cincinnati Bearcats @GoBEARCATS
192K Followers 693 Following University of Cincinnati Athletics. #Bearcats
Sri Batchu🇺🇸 @sri_batchu
5K Followers 1K Following Operator & Angel. CV: CMO @therealreal. Head of growth @tryramp, @Instacart and ops at @opendoor. Alum of @baincapital @mckinsey @Dartmouth @HBS.
Paul Graham @paulg
3.4M Followers 794 Following
Parker Conrad @parkerconrad
222K Followers 501 Following Rippling payroll & HRIS admin, CEO. Nothing here should be construed as investment advice nor used in any investment decisions related to Rippling.
Garry Tan @garrytan
896K Followers 6K Following President & CEO @ycombinator —Founder @garryslist—Creator of GStack & GBrain—designer/engineer who helps founders—SF Dem accelerating the boom loop
BacchusBulls @yk222610
190 Followers 257 Following My portfolio: $AMD, $LMND, $IREN, $ASST, $RXRX, $OPEN. Not financial advice. This is my only account.
Ethan Choi @EthanChoi7
8K Followers 5K Following prev @Khoslaventures, @Accel /views r my own. wrk w/ @OpenAI, @ClickHouseDB, @glean, @vercel, @tryRamp, @AbridgeHQ, @R1RCM, @Anrok, @dualentry, outsmart
Eyal Klein @EyalKlein1
9 Followers 72 Following
Chintan Parikh @chintanparikh94
1K Followers 2K Following building something new (yc f25). prev @secureframe @opendoor, @georgiatech, @teamcappio. @seedfeedteam, @startupXchange
Molly O’Shea @MollySOShea
61K Followers 875 Following Investing & Tech →Newsletter/Podcast @Sourceryy | HUGE Fan @brexhq @Turingcom @public @deel
Andy Berman @berman66
7K Followers 779 Following CEO of @runlayer. Prev: Director of AI @zapier, Founder @getnanit
Ramez Naam @ramez
58K Followers 9K Following Climate and clean energy investor. Author of 5 books. Energy & Environment co-chair @SingularityU. Trying to build a better world.
Opendoor @Opendoor
39K Followers 280 Following Tilting the world toward homeowners and people working to become homeowners.
Yan @yanismydj
722 Followers 684 Following swe @opendoor @xferrecords previously Eng @ProtonRadio, Lead Eng @Checkr, CTO Zen99 (@ycombinator S14)
Morgan Brown @morganb
66K Followers 1K Following Chief Growth Officer at @opendoor. Married to @erikab. Proud Dad.
Deedy @deedydas
245K Followers 6K Following Partner at Menlo Ventures. ex-founding Glean, Google Search. Cornell CS. Investor: Anthropic, OpenRouter, Modal, Wispr Flow, Inception, Prime Intellect
Jeff Dean @JeffDean
444K Followers 6K Following Chief Scientist, Google DeepMind & Google Research. Gemini Lead. Opinions stated here are my own, not those of Google. TensorFlow, MapReduce, Bigtable, ...
Danny Su @cwdannysu
244 Followers 25 Following
Kaz Nejatian @nejatian
78K Followers 2K Following Karma + Free Market. @Opendoor CEO. Mr. @CandiceMalcolm.
Aman Dhar @adhar0
22 Followers 85 Following
Paras Doshi @paras_doshi
2K Followers 2K Following head of data at Opendoor | ex-Amazon — I help businesses thrive using Analytics & data science! 📈 Blog: https://t.co/9VaPcRdqbh
Yink Teo @yinquanteo
640 Followers 622 Following Director of Eng @opendoor. Previously @sourcegraph, @twitter, @tellapart, @referralcandy. Amateur Singaporean 🇸🇬 Powered by 🧋
Yang Guo @yang_guo
2K Followers 246 Following CIO @opendoor | Ex-HFT | 50% Investor 50% Punter Smark | player/coach Opinions are my own.
adam bain @adambain
119K Followers 10K Following Investor at 01A. We spent a fortune on our website, so check it out: https://t.co/So3Ge6bpkR. Was Twitter COO.
Joe Callinan @joecallinanjr
795 Followers 93 Following Head of Product @Opendoor // Entrepreneur // Sports Coach // Learner of things
Colm MacCárthaigh @colmmacc
37K Followers 2K Following VP / Distinguished Engineer at Amazon Web Services. Also: Open Source and Apache, Cryptography, Irish Music, mediocre Photography.
Christian Selig @ChristianSelig
73K Followers 2K Following iOS developer, creator of @ApolloReddit, @PixelPalsApp. Previously at . he/him. Pronounced See-lig. i love aminals. 🌱
Rishi Kulkarni @rishikulkarni
1K Followers 3K Following Co-founder https://t.co/Zagg7qHRNk, Co-founder @revv_so (acquired LegalZoom). Founder @1clickio (acquired Freshworks)
Araa Doraisamy @araa3185
751 Followers 671 Following Design @Opendoor! Always curious to explore something new! Founding member @Revv_so (acquired) @iFrilp (acquired).
Revvsales Inc. (Acqui... @Revv_so
783 Followers 121 Following Revv is a leading document automation and eSignature platform that revitalizes your day-to-day business operations.
Sameer Goel @TweetSamG
415 Followers 435 Following Co-Founder - @GoPitCrew | @LegalZoom, @Revv_so, @FreshworksInc, @Yahoo, @nokia, @greytip
Gergely Orosz @GergelyOrosz
339K Followers 3K Following Writing @Pragmatic_Eng, the #1 software engineering newsletter on Substack. Author of @EngGuidebook. Formerly Uber & Skype.
Magnus Carlsen @MagnusCarlsen
1.1M Followers 138 Following World Chess Champion. Playing for @TeamLiquid.
Papers We Love NYC @paperswelovenyc
924 Followers 165 Following News and updates from the NYC chapter of @papers_we_love!
SPARKsocialSF @SPARKsocialSF
3K Followers 113 Following 📍 Mission Bay SF 🌮 Food Truck Park 🍻 Beer Garden 🎉 Event Space 🥗 Catering
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