Excited to introduce @Cosign: the curated professional network for the startup community: cosign.co Our goal is to create the following: - A comprehensive startup directory of investors, companies, and operators, including what they worked on and who they worked on it with. - Cosign graph: Who shaped your career? Who were you actually in the trenches with? Who would work with you again? Who thinks you’re someone to watch? - Durable reputation: Great endorsements happen every day on X and disappear into the feed. Cosign attaches those signals permanently to people and companies. - Discovery: Who are the best fintech angels? Which AI companies should I watch? Who are the best designers? - Intent network: Privately signal “I’d invest in them,” “I’d hire them,” “I’d work with them,” or eventually even “I’d acquire this company.” Match people when interest exists on both sides. Imagine if Wikipedia, LinkedIn, and OG AngelList had a baby. Though Cosign is a community, not a business. In order to join, you need to be cosigned. Or you can apply directly. David Booth and I started this idea 7 years ago but didn’t have the firepower to make it work. Now we do. No one has really touched LinkedIn in 20 years. Excited to take a swing. cosign.co

Packy McCormick's picks for the most compelling companies to join: "ambitious missions, exceptional talent density, steep learning curves, and the potential to create enormous value." Software / AI - Ramp - Thatch - Replit - General Intuition - Arena Physica - Blackbird - [untitled] - Poetic Hardware / infrastructure - Base Power - Anduril - Hadrian - Astro Mechanica - Somos Internet - Meter - Earth AI - Radiant - Varda Space - Fuse - Westmag - Antares - Terraform Industries - Standard Nuclear - Standard Bots - Valar Atomics - Ulysses - Aalo Atomics - Senra Systems - Impulse Labs - Vight - General Matter - Monumental Labs - Daylight Computer - Airbound - Autoridad Panandina Services - Primer - Wander cosign.co/lists/packym/top-c…

the list of cracked devrels on X. they make cool demos, explain technical stuff simply! topdevrels.vercel.app

More thoughts There is an endless number of lists of people who are good at devrel devx growth engineering etc but what they are all missing is WHY. so I will give you a few of my personal opinions 1. @charles_irl at modal the perfect example of someone who is an engineer first but deeply cares about education. Before modal, Charles was an educator and it’s extremely apparent in how he approaches his content. 2. @trq212 at Anthropic is actually really humble about his growth with the fact he works on Claude Code and that people are naturally excited about Claude code. But one analogy that Thariq shared that I think rings very true for why he does good work is this idea of reaping and sowing. You must reap (do a lot of research, experimentation, talk with customers, hands on engineering) before you can sow (create good content). There are too many people who skip the reaping and go straight to sowing slop. 3. @philipkiely from Baseten is phenomenal because it’s one thing to create content but it’s another to build the systems that turn that content into high value pipeline generation. Two many people miss this second step of thing your work to baseline revenue and overly rely on “vibes” of doing good work. Anyone would be lucky to have this TOFU machine. 4. @mattyp at spaceX is extremely consistent but has also mastered the home setup/ camera investment that he’s able to produce good quality content very efficiently and fast in order to stay with the times. 5. @ad0rnai at prime intellect is very good at making videos! But her special power that more people need is an attention to detail. To many it will feel like overthinking when she hosts and event or films a video but she will play at your hidden heart strings in ways you don’t even know to make you fall in love with her work.

Which companies have the most motion? Voting is open: cosign.co/questions/companie…

Who are the ppl in your career who took a chance on you? Who either put their time, reputation, or even money on the line to open doors for you?

Who are the most tasteful companies in tech? Vote now: cosign.co/questions/highest-…

literal hardest role to hire for rn and every ai startup wants someone > chronically online (knows trends) > has taste & can create (new media) > understands ai & technical > can execute with quality (operator) such a small niche of folks who can do this

Life update: I defended my PhD at @StanfordAILab and recently joined @OpenAI! Extremely thankful to my advisors (@chelseabfinn & @percyliang), collaborators, friends, and everyone else who supported me along the way. ❤️ Very excited for this next chapter!