Charlie Warren @charliewarren
YC Visiting Partner, former CEO/Cofounder of Convex (acq by $TTAN), physical and vertical AI, services, & industrials investor. Dad. charliewarren.com San Francisco, CA Joined February 2026-
Tweets311
-
Followers922
-
Following88
-
Likes852
Lots of people are comparing EveryApp to REA. Yes, there probably will be open source clones of most software. But... what's more exciting is that everything needs to rebuilt with agents in mind. You can't clone this because they don't exist.
I've seen the rise of voice agents up close in vertical AI companies. And then the latency issues + skyrocketing costs of using exclusively closed models. @hopper_research solves both of those. Excited for the launch today --
There’s a huge blindspot in the inference market today: it’s built almost entirely for coding agents. Voice is how billions of people will interface with AGI. That’s what we’re building at @hopper_research : the inference cloud for voice Excited to launch today at
SaaS is evolving by natural selection. EveryApp is what's next. Most horizontal software should be rebuilt for agents and open source. @bensenescu already did it with OpenSEO: 25K+ GitHub stars, with all organic, crazy fast growth. CRM + Analytics are now live. Launching today 👇
Introducing EveryApp (YC F26). Our mission: make every app open source. We started with OpenSEO (24k GitHub stars). Now we're doing it for every app your business runs on. Star the project, try an app, or build your own 🧵
You've been grinding on S-1 teardowns for years. Dozens of boring SaaS companies. The time is now. This is your moment.
The AI infrastructure build-out is short on workers. I've seen it firsthand with former customers building data centers. @shepherd_si is taking it on. Wiring takes dexterity at the frontier of robotics, and few teams can pull it off. Thrilled to back them at @ycombinator.
Introducing Shepherd Robotics (YC F26). We’re building robots for data centers and advanced manufacturing—starting with equipment testing, inspection, and electrical wiring & assembly. Bring capacity online faster. Increase production. youtube.com/watch?v=UAw41Q…
I got to see @FarzaTV up close in P26. Refreshing to see a real builder do his thing. More behind the scenes of how he ships and launches 👇
There’s a misconception that a successful launch video needs to cost tens of thousands of dollars and feel like a high production commercial. But @FarzaTV has a different approach. Farza is the founder of @heyclicky and previously built Buildspace, one of the largest online
Attended @ycombinator early access event yesterday evening! AI is making software faster to build. A new generation of startups is building the tools to run, test, and improve it. Five companies worth a closer look: Boxes — Cloud computers for coding agents, letting teams run Claude Code and Codex in parallel. Founders: Nick Bushak (@nbushak) and Drew Regitsky (@drewregitsky), both previously at Gem. Caveman — Helps AI agents use fewer tokens and run more efficiently, reducing the cost of getting work done. Founder: Julius Brussee (@julius_brussee). Rystic — Builds simulated APIs so developers can test software and agents without depending on live services. Founders: Zachary Kiihne and Evan Whitehouse. Simulithic — Sends AI users through your app across devices and browsers to find broken flows, without manually writing every test. Founders: Ryan Ning (@itsnotryan) and Satyam Singh (@KlausCodes). ObsessionDB — A real-time data warehouse built for agents to ingest and query large amounts of data efficiently. Founders: Rafael Aviles (@avilesrafa), Marc Höffl (@marchoeffl), and Marc Leuthardt (@marcmacmac). Also great to reconnect with my friend from Harvard, Charlie Warren (@charliewarren), now a Visiting Partner at YC and previously cofounder and CEO of Convex. My takeaway: faster development creates demand for better testing, infrastructure, and reliability. There’s room for significant companies across that stack. Which other early-stage companies should I be following? Company links in the reply below.
@shcallaway @AniC_dev i think of you as the black cargo pant guy tho
The internet may be melting. But I'm still getting unsolicited texts to sign up for new payroll software before the end of the year. We're gonna be alright.
The top end of growth rates for companies riding an AI tailwind just keeps accelerating.
@sequoia is leading our Series C at a $1B valuation. We started Blacksmith in 2024 to make CI faster and less painful. In January we ran 5 million CI jobs a week. Today it's over 90 million and growing, and we’re still early.
@hthieblot 💯. The Paper Plate award of startup sales
Biggest change since I started my company in 2017: the "design partnership." It's the Coach's Award of startup sales. Just ask for a paid contract and get used to 'no'
All businesses will need new websites for agents. @MilesPines has (already) built the best product on the market. Incredible traction and incredibly happy customers across 10K+ sites.
Small businesses don't need a website builder. They need someone to do their marketing. They need Theo. @theo_site (YC F26) is the AI agent that builds - or rebuilds - your site, then works 24/7 to get you found on Google and in AI search. You run the business. Theo does the
Apply to YC and it will change your life We grew from $0 to $1M annualized revenue during the batch What you get from YC: → $500K investment → A cohort of ambitious founders who push you beyond your limits → Partners like @garrytan & @gustaf who have your back for life → $11.5M in perks and credits → Bookface + alumni founder community (also for life) → Demo Day in front of thousands of investors
Applications for the YC Winter 2027 batch are now open! Apply by November 2: ycombinator.com/apply
Sabashan Ragavan @sabashanR
2K Followers 8K Following Founder & CEO @HeyMiloAI ex-engineer/product @Instagram reels, @Microsoft teams
Hussein A. @Hussi3
246 Followers 1K Following Building BlinkerOS - BlinkerOS runs security and facilities companies. Blinker, the AI inside it, reads every field inspection, NFC scan and guard note as it la
Tom Lynch @_ontologies
18 Followers 218 Following
Rocco Mag @MagRocco
0 Followers 53 Following
Pouri Erfanzadeh @erfnzdeh
121 Followers 857 Following Member of Technical Staff at https://t.co/KICdWQ5N5s | Sharif University Grad
zjb @zjb56056924
18 Followers 219 Following
sk builds @skpnky
4K Followers 3K Following a curious human who loves tech and talks around it 👩🏻💻 • product / marketing • building; https://t.co/YnZ1HoXNkC • spreading : https://t.co/ZQ8eBmINKj
T @theopspro
9 Followers 326 Following
Prince @pprince0997
255 Followers 2K Following 🇩🇪🇮🇳founder emboscale/ prev. cofounder formula student team/ prev. multi-physics simulations at porsche
João Fernando @joao_fernandok9
0 Followers 12 Following
Amanda Groves @AmandaGrovyclr
3 Followers 47 Following
LY Traders AI Lab @lytraders
242 Followers 4K Following Research. Build. Deploy. Building automation tools for MetaTrader5 Auckland, New Zealand. https://t.co/qFa94NaJQq Email: [email protected]
Steven | koru.do @liechti_dev
1K Followers 1K Following Building https://t.co/vJzSme0EU3 - an open source, local-first multiplayer AI workspace.
Kai (Shepherd Robotic... @kai_r_pap
3 Followers 8 Following Shepherd Robotics (YC F26), previously self driving cars at Cruise & Rivian
Stella Sida Zheng | �... @zheng_sida
1K Followers 3K Following Founder @go_rosen /@PayPal Dev Champion /@paypal x @google hackathon winner /@Circle grantee / Alum @skydeck_Cal @draper_u
Michael @0xprovel @pingujuice
636 Followers 3K Following I audit the design and code of products built with AI. Founder @proveldesign. 15 years designing. Web3 and AI products. Launched 0x on https://t.co/A62QhO8Ten
Brian DeLucia @briandelucia
2K Followers 3K Following Arrivato LLC - Private Office - Strategic Finance - Aligned Partners
brian 🇺🇸 @_brianpitts
6K Followers 656 Following Founder @revenantfactory. Building America's next generation of CNC machines that operate autonomously. Reindustrializing America 🇺🇸
Hồ Đại Dương @nash_duong
0 Followers 37 Following
GVSS Viswa Teja @GVSSVT
2 Followers 6 Following
Dennis Knodt @dennisknodt
442 Followers 2K Following Co-Founder @ Valuent the Salesforce boutique consultancy - techno-optimist - sharing serendipity
David J Phillips @davj
21K Followers 6K Following Founder & CEO @fondocom – accounting & tax on autopilot for 2,000+ startups. Angel: Flexport, LiquidDeath, Rippling, 100+. Host: @thestartpod
Anuj Pal @AnujPal24012007
52 Followers 1K Following
KuphDev @KuphDev
5K Followers 2K Following Founder @Rowve_Inc: physical intelligence for field labor 🧑🌾🤖 Janitor @Mimix_xyz: instant creator campaigns to amplify the reach of any post
Abdou.eth @abdoualami19
562 Followers 331 Following #Crypto 💵 | Product Developer | Watch Enthusiast ⌚️ | Technical ＆Volume Spread Analysis 📈📊 | Swing Trader | tweets are not financial Advice DYOR
Guy Kerr @hereiam_42
26 Followers 272 Following
Gaurab Chakrabarti @Gaurab
42K Followers 1K Following CEO @Solugen | MD/PhD building the modern chemical industry | Making molecules that power humanity | Takes on manufacturing, energy, molecules, and biology
Yoshi | WorldFlux @yoshi_flux
366 Followers 693 Following Founder @ WorldFlux. Building tools to reproduce Open-RMF failures & verify fixes in simulation. Seeking design partners. @fdotinc Canopy alum.
Ryan DeMuro @TheRyanDeMuro
0 Followers 351 Following
Elliot Drel @elliotdrel
39 Followers 121 Following Co-Founder @buildpurdue (Founder/Builder Community) + Founder Polyidus + Student @LifeAtPurdue
Endowment Eddie @endowment_eddie
8K Followers 1K Following Investment generalist seeking elite asset managers. Unlimited time horizon. Views are my own, some parody. Definitely not investment advice.
🤓 Andy Keil @alwaysunday
3K Followers 2K Following Co-founder of @DreambaseAI, the portable Data Layer for Agents. @supabase fan. Lots of Pickleball 🏓
Shardul @ShardulAggarwal
175 Followers 662 Following organic super dumb intelligence continually learning occasionally working @ConvoSearch
Julian Weaver @juliver
41 Followers 40 Following professional telepathy guy ceo & cofounder @dydema (YC F26)
El_Carim @MrPerbi
53 Followers 87 Following Documenting my journey and sharing my opinions. Mors Transmutatio Renascor 🗼
Tanay Agrawal @tanayagrawal19
430 Followers 395 Following Building @quivlyai Backed by @ycombinator ex - @WePay @jpmorgan @atlanhq alma mater @CarnegieMellon
Sam @Samdifer1
2 Followers 32 Following
☀️ Garrett @garrettjsawyer
2K Followers 4K Following founder, hardware ∴ embedded systems robotics ∴ physical intelligence prev @Amazon / @Ring 🌎🕊️🌱
Gokul Rajaram @gokulr
127K Followers 737 Following investor (https://t.co/WA10gfNx1G) and builder (https://t.co/LCuVTn3s4w, https://t.co/sfUX2diZKs, https://t.co/ecI8a0tSMi)
Hubert Thieblot @hthieblot
61K Followers 3K Following Investing @fdotinc, Founder @curseforge acq by @Twitch, love @oheather1337, 3x dad, 🇫🇷🇨🇭🇺🇸
Philip Johnston @PhilipJohnston
31K Followers 1K Following Co-Founder & CEO of @Starcloud_ | Co-Founder & CEO of @FermiExplorer
David J Phillips @davj
21K Followers 6K Following Founder & CEO @fondocom – accounting & tax on autopilot for 2,000+ startups. Angel: Flexport, LiquidDeath, Rippling, 100+. Host: @thestartpod
Gaurab Chakrabarti @Gaurab
42K Followers 1K Following CEO @Solugen | MD/PhD building the modern chemical industry | Making molecules that power humanity | Takes on manufacturing, energy, molecules, and biology
Sherwood @shcallaway
8K Followers 5K Following Founder @sazabi ◆ DevOps/Infra/o11y ◆ Early Eng @brexHQ ◆ 2x @ycombinator
Endowment Eddie @endowment_eddie
8K Followers 1K Following Investment generalist seeking elite asset managers. Unlimited time horizon. Views are my own, some parody. Definitely not investment advice.
Jeetu Patel @jpatel41
27K Followers 2K Following Technology Executive & Board Member. President & CPO, Cisco. Proud dad. Love design. Views are mostly my own, but sometimes not entirely my own ;-)
Daniel Gross @danielgross
408K Followers 0 Following
Jawwwn @jawwwn_
32K Followers 1K Following posting into the void 📺🫡••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Pete Koomen @koomen
16K Followers 2K Following GP @ycombinator, cofounded @optimizely https://t.co/5hkCw4y95d
Alexandr Wang @alexandr_wang
836K Followers 945 Following chief ai officer @meta, founder meta superintelligence labs, founder @scale_ai. give everyone the adulthood they dreamed of in childhood
Mathilde Collin @collinmathilde
24K Followers 1K Following Co-founder & Exec Chair at @FrontHQ. Angel investing. KORA.
Eli Wachs 👣 @EliWachs
2K Followers 893 Following Founder of @UseFootprint Building AI to topple cartels and corrupt regimes | Part-time comic
QM @qm__dev
1K Followers 1 Following Building "QM", an open-source multiplayer agent harness. Made by Y Combinator.
Alfred Lin @Alfred_Lin
151K Followers 366 Following Partner @sequoia. Working w/ founders from idea to IPO & beyond: @airbnb @doordash @citsecurities @kalshi @clay @foundforbiz @Nominal_io @zipline
Jen Abel @jjen_abel
27K Followers 993 Following GM of Enterprise @stateaffairsUS … Co-Founder @jjellyfish_co … diary-ing my sales expereince
trailcam @Trail_Cams
1.4M Followers 185 Following
Tyler Bosmeny @bosmeny
9K Followers 683 Following Tyler: ('old engl'); One who tiles roofs. Co-Founder of @Clever. Now Partner at @YCombinator
Keunhong Park @KeunhongP
4K Followers 780 Following Pre-training lead at World Labs. Atlas project lead (https://t.co/a81eDVLlXF). Opinions are my own.
Katja Schwarz @K_S_Schwarz
2K Followers 516 Following Building world models. Ex-Meta AI Researcher. Previously PhD at Autonomous Vision Group in Tübingen.
World Labs @theworldlabs
116K Followers 54 Following World Labs is a leading spatial intelligence company building frontier models that can perceive, generate, reason, and interact with virtual and physical worlds
Blake Scholl 🛫 @bscholl
203K Followers 2K Following Founder/CEO @boomsupersonic. Life is short so if you want to do a lot, it helps to move fast.
Anjney Midha @AnjneyMidha
53K Followers 3K Following founder, scientist, teacher @amppublic @stanford @frontiersystems • scaling alignment.
Sawyer Merritt @SawyerMerritt
1.2M Followers 501 Following EVs/space/tech. Bringing you the latest news in a single, easy-to-read feed. $TSLA & $SPCX investor, Model Y owner.
Jason Freedman @jasonfreedman
12K Followers 4K Following GP Orange Collective - The YC Unc Fund | YC alum: S09 and W12 | Investor in Starcloud, Corgi, Mastra, Ironclad, Steadily, Browser-use and 100+ more
Nemil Dalal @nemild
11K Followers 1K Following @ycombinator Visiting Partner | x402 ambassador | Ex-@coinbasedev lead | Ex-$USDC lead @coinbase | Crypto class of 2014 | YC S12, Stanford
James Evans @dazzeloid
2K Followers 869 Following visiting partner @ycombinator, co-founder @commanddotai
max @maxkolysh
5K Followers 514 Following visiting partner @ycombinator || founder at @doverhq @zincdotcom
Eric Vishria @ericvishria
25K Followers 873 Following GP @Benchmark Director @confluentinc @Cerebras @Contentful @Benchling @CommerceLayer @acuitymd @FireworksAI_HQ @quilterai @pomerium_io @greptile @sundayrobotics
Jake Mintz @jakemintz
3K Followers 543 Following CPO @ Valon. Angel for 150 startups. Ex-Stripe. Ex-Google. Ex-Bump co-founder. In Seattle, from Alaska.
Norgard @BrianNorgard
187K Followers 3K Following Ex-CPO Tinder, Norgard Capital, SpaceX/Andruil/Lyft/Notion/AngelList/Airtable/eToro/StockTwits/Deel/Hadrian/ValarAtomics/DiDi/River/Alpaca/LiquidDeath/Sword
Chris Power @2112Power
96K Followers 6K Following Techno-industrialist, believer in hard power and Pax Americana. Automated Factories and the New American Workforce are how we win.
Troy Kirwin @tkexpress11
15K Followers 3K Following Investor @a16z @speedrun | ex-@Unity | chase what matters
spor @sporadica
223K Followers 1K Following CTO (Chief Taste Officer) @ your great-grandmother's palantir-inspired drone swarm startup ,, husband @_nontechnical
Jeff Henriod @JLHenriod
1K Followers 2K Following My wife tells me to tweet more. Investing in YC founders. Before that: AWS, Lambda School, Amazon, TFA
Finbarr Taylor @finbarr
7K Followers 936 Following Founder & former CTO & CEO @Shogun, Visiting Partner @ycombinator. Angel investor in 80+ companies. Startups, the universe and everything. 🏴
Luther Lowe @lutherlowe
17K Followers 7K Following Fighting for little tech. Head of Public Policy, @YCombinator. @Weijia wife guy.Trends for United States
You might like
