The AI Health Assistant He Wished Existed | Juno (YC P26)

The AI Health Assistant He Wished Existed | Juno (YC P26)

Juno reached 20,000 daily active users with AI health tracking, took $2M from OpenAI, and cracked consumer growth. Here’s how. In this episode, I sit down with Marshall Gold, founder of Juno (YC Spring 26), to unpack how an Oxford genetics researcher turned personal health struggles into one of the standout consumer apps of the batch.  They break down the mechanics of consumer AI virality, why user-generated content ads are hitting a ceiling, and how $2M in OpenAI compute subsidizes their free tier. What you will learn: * Why the average chronic illness diagnosis takes 7.6 years and how AI changes the math * How Juno scaled past 100K signups and 20K DAUs with zero headcount expansion * The exact playbook for transitioning from paid user acquisition to organic loops * Why UGC marketing fatigue will hit consumer apps over the next 12 months * How to structure $2M in compute credits to drive free-tier user referral engines * The strategic rationale behind local edge models for patient privacy 📌 Watch now and subscribe for more smart, fast, founder-first interviews. TIMESTAMPS: 00:00 Seven Year Diagnosis Problem 00:07 Meet Juno Founder 01:01 Podcast Intro and Stakes 01:55 Marshall Health Journey 02:54 Chronic Illness Social Media 04:06 From Community to Product 05:43 Patient Interviews and YC 06:51 What Juno Actually Does 09:37 Why It Spreads Fast 10:27 Organic Growth Playbook 13:03 UGC Growth Is Fading 15:15 Engineering Virality Features 18:41 OpenAI Token Deal Explained 19:31 Scaling Costs and Free Tier 21:23 When Tokens Run Out 21:58 Edge Models and Privacy 22:50 When Phones Run LLMs 24:18 Scaling Growth Loops 27:54 B2C Versus B2B Virality 33:06 Consumer Growth Plateau 34:34 AI Personalization for Chronic Illness 35:41 OpenAI Health Competition 38:57 Apps Versus Superapps 40:22 Anthropic Case Study 42:31 Where to Find Juno 🎧 Listen on the go: Spotify: https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP [https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP]  Apple: https://apple.co/4cZ8RMm [https://apple.co/4cZ8RMm]  My other YouTube Channel: https://www.youtube.com/@lobstercap [https://www.youtube.com/@lobstercap] This Lobster Talks episode is brought to you by YC Roaster, a free tool helping founders improve their YC applications.  🔗 https://ycroaster.com [https://ycroaster.com]

This YC Founder Gives Away What Others Sell for Millions

Most founders think identity verification is just a boring compliance box. Alberto Rosas, CEO of Didit, flipped the script by offering a developer-first freemium model that took the US market by storm. In this episode, we unpack how Didit is using product-led growth to scale an infrastructure play that could outgrow the online payments market. What you will learn: - How Didit cloned the exact developer-first playbook Stripe used to hit a $100B scale - The exact mechanics of cracking PLG in a highly regulated, historically opaque industry - Why the explosion of AI bots will force humans to verify their identity multiple times a day - The structural reason why blockchain is completely inefficient for digital identity protocols - The 20x fundraising arbitrage: A raw look at raising capital in Europe versus Y Combinator Demo Day 📌 Watch now and subscribe for more smart, fast, founder-first interviews. Chapters 00:00 Playing the Big Leagues 00:22 Meet Didit and the Big Bet 01:22 Stripe for Identity 03:17 New Use Cases Beyond Compliance 09:16 AI Fraud and Daily Verification 12:44 Trust Scores and Identity Wallets 16:10 Does Identity Need Blockchain 19:11 Why Join Y Combinator 20:31 Moving to the US for Scale 24:38 YC Roaster Sponsor Break 25:44 YC Network Shortcut 26:19 Credibility And Access 27:40 Inside The YC Batch 29:15 Fundraising 20x Easier 29:41 Why YC Is Unique 31:21 Product Led Growth Basics 33:07 GTM Intuition Over Tests 36:51 Frictionless Transparent Product 39:10 Iterate Fast To Win 43:53 Big Vision And Predictions 45:17 Where To Find Didit 46:11 Final Thanks And Subscribe 🎧 Listen on the go: Spotify: https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP Apple: https://apple.co/4cZ8RMm My other YouTube Channel: https://www.youtube.com/@lobstercap This Lobster Talks episode is brought to you by YC Roaster, a free tool helping founders improve their YC applications. 🔗 https://ycroaster.com

Insurance Puts Hospitals On Hold On Purpose. His AI Waits Them Out

The standard view in enterprise tech is that hospitals are an impossible sell. The sales cycles take years, legacy systems are hopelessly entrenched, and bureaucracy kills early-stage companies. But there is a massive structural loophole. Insurance giants are intentionally creating artificial friction, using mandatory 40 minute phone holds to run out the clock on hospital billing cycles. In this episode, Suhail from LunaBill breaks down how they built a pipeline of enterprise contracts by automating the revenue cycle. We discuss his contrarian approach to pre-seed customer discovery, the real reason why healthcare software giants have an Achilles heel, and how AI is fundamentally unwrapping a multi-trillion-dollar global services economy. What you will learn: - How insurance companies weaponize long wait times to relegate hospital claims into zero percent recovery brackets. - The pre-seed strategy of taking an industry job to map your ICP without burning venture runway. - Why the service industry is ten times larger than software and how AI-native tools scale into it. - How to successfully navigate enterprise vendor consolidation by transforming a point product into a platform. - The 2031 macro prediction for human telephone infrastructure in the medical sector. 📌 Watch now and subscribe for more smart, fast, founder-first interviews. Chapters: 00:00 Dead Revenue Problem 00:05 Meet LunaBill Founder 00:46 Voice AI For Claims 02:09 Insurers Slow Walk 04:18 Outsourcing And AI 04:52 Aging Claims Math 06:46 Origin Story Pivot 09:09 Hospital Buying Psychology 13:28 Jobs Before Startups 17:40 Internship Versus Pivot 19:31 YC Roaster Pitch 20:11 Why Expand Beyond Billing 20:51 Customer Requests Drive Scope 22:02 Hospital Onboarding Reality 23:59 Repositioning as Voice Platform 24:47 Playing to Team Strengths 26:51 AGI Replacement Concerns 28:10 Healthcare Moats Relationships 30:38 Bigco Speed vs Startups 32:20 2031 Prediction AI Calls 33:46 AI Native Revenue Cycle Future 36:06 AI Rewrites Legacy Systems 37:21 Luna Bill Growth Goals 37:53 Where to Find Luna Bill 38:06 Wrap Up and Subscribe 🎧 Listen on the go: Spotify: https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP Apple: https://apple.co/4cZ8RMm My other YouTube Channel: https://www.youtube.com/@lobstercap This Lobster Talks episode is brought to you by YC Roaster, a free tool helping founders improve their YC applications. 🔗 https://ycroaster.com

They Said Electric Cargo Ships Were Impossible. Now They're Funding Him..

Silicon Valley loves software, but the massive gains of the next decade belong to atoms. Fleetzero founder Steven Henderson joined YC to solve a multi-billion dollar problem: decarbonizing ocean freight without crushing the global economy. By redesigning cargo ships from scratch, eliminating onboard crew infrastructure, and deploying massive battery hybrids, Fleetzero is undercutting diesel on pure unit economics. What you will learn: - The exact math behind a 5,200 nautical mile voyage on a single battery charge. - Why alternative green fuels like ammonia and methanol will cause global shipping costs to skyrocket. - How removing human crew quarters slashes ship construction CapEx by 60% to 80%. - The contrarian wedge strategy of using hybrid ports to fund infrastructure build-outs. - How to raise capital from top-tier VCs as a total Silicon Valley outsider. 📌 Watch now and subscribe for more smart, fast, founder-first interviews. Chapters: 00:00 Maersk Comes Around 00:26 Meet Fleetzero 01:11 Ships as Robots Vision 02:06 Why Electric Enables Remote 02:36 Maintenance Is the Real Job 04:30 Autopilot Today Edge Cases 05:24 Cheaper Safer Cleaner Future 08:56 Humans Still in Loop 09:55 Crew Numbers and Lookout Rule 11:07 Octopod Teleoperation Demo 12:39 Batteries and Port Charging 15:20 Hybrid Wedge for Infrastructure 17:33 Beyond Batteries Nuclear Fusion 21:11 Piracy and Security Angle 23:04 Sea Power and Shipbuilding Decline 24:28 Sea Power Revival 25:31 Crew Costs Shock 27:57 Zero Crew Ships 29:18 Product First Strategy 31:08 Partner Not Shipyard 32:08 Maersk Turns Ally 34:16 Contrarian Investing Talk 37:13 YC Network Playbook 41:57 Hiring In Houston 44:14 Roadmap And Wrap 🎧 Listen on the go: Spotify: https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP Apple: https://apple.co/4cZ8RMm My other YouTube Channel: https://www.youtube.com/@lobstercap This Lobster Talks episode is brought to you by YC Roaster, a free tool helping founders improve their YC applications. 🔗 https://ycroaster.com

YC Valuations Are Getting Insane (P26 Demo Day Debrief)

The boots on the ground download from YC P26 Demo Day in San Francisco shows the macro venture market is shifting fast. We sit down right after talking to founders on the floor to analyze the wild valuation spikes, the hardware renaissance, and the new breed of post revenue companies utilizing the accelerator. Learn why the traditional boundaries of seed and Series A are completely dissolving. What you will learn: * The math behind the latest 500 million dollar YC valuations * Why companies with 1 million plus ARR are giving away 7 percent equity * How in silico simulations are dropping biotech R&D costs from millions to hundreds of dollars * The operational mechanics of an AI running a company with a human legal proxy * Why Standard Capital and others are building the next framework for Series A cohorts 📌 Watch now and subscribe for more smart, fast, founder-first interviews. Chapters:  00:00 Valuations Feel Crazy 00:20 Demo Day Debrief Setup 01:14 YC Rhythm And Energy 02:38 Bubble Talk And Big Rounds 04:32 Hardware Is Back 08:25 YC As A Growth Hack 11:16 Post PMF YC Debate 15:12 How Investors Price Risk 18:28 AI Meets Bio Breakthroughs 27:22 Fund Timelines And Patience 30:50 The World Accelerates Fast 34:04 AI Run Companies At YC 38:52 Wrap Up And Sign Off 🎧 Listen on the go:  Spotify: https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP [https://open.spotify.com/show/1u1JyRKH8JYFjhBkvTUOAP]  Apple: https://apple.co/4cZ8RMm [https://apple.co/4cZ8RMm]  My other YouTube Channel: https://www.youtube.com/@lobstercap [https://www.youtube.com/@lobstercap] This Lobster Talks episode is brought to you by YC Roaster, a free tool helping founders improve their YC applications.  🔗 https://ycroaster.com [https://ycroaster.com]