Lloyd Armbrust

The Demo Day countdown.

The wins, mistakes, and chaos of building RonanRx on the road to Demo Day 2026.

27days until
demo day
Day 27Aug 14Back in YC, sixteen years laterSixteen years after his first Y Combinator batch, he is back in the current one. Sets the target the rest of the run is measured against: ten percent growth a week.1:48
26days until
demo day
Day 26Aug 15The agent broke overnightAn automated agent was set loose on stalled patient conversations and did not survive the night.1:53
25days until
demo day
Day 25Aug 16Racing for a flight to buy a pharmacyTo do what the company needs to do, it has to own a pharmacy. First he has to make the flight to San Diego.1:46
24days until
demo day
Day 24Aug 17Buying the pharmacyThe purchase goes through. Software stops being the whole company on this day.1:48
23days until
demo day
Day 23Aug 18The prescription with no syringeEvery legal step to manufacture and ship a prescription drug was solved, except the one thing a patient needs when the box arrives.1:44
22days until
demo day
Day 22Aug 19A copywriter roasts the websiteNeville Medhora goes through the AI-written site line by line, on camera, and it does not go well.2:06
21days until
demo day
Day 21Aug 20Free haircuts outside YCA stunt on the sidewalk outside Y Combinator: free haircuts, and a conversation about GLP-1s while you sit. Thirty two cuts, three customers.1:34
20days until
demo day
Day 20Aug 21Paul Graham names the companyPaul Graham names the company at his house. Never cut locally, so this is the copy that went out on X. At 4:31 it is the longest of the run.4:32
17days until
demo day
Day 17Aug 24YC doesn't want old foundersAn airport monologue about age and kids and who Y Combinator is supposed to be for. Six kids, two batches, sixteen years apart.1:47
16days until
demo day
Day 16Aug 25The whole company in one carEveryone piles into one car and drives to Oakland with two hours to shoot a clean room commercial. Contains the payoff to day 20.2:28
15days until
demo day
Day 15Aug 26Missed the dayForty four seconds, filmed at midnight, about having missed day 15 entirely while building the investor deck. Fire alarm going off.0:44
14days until
demo day
Day 14Aug 28Fundraising opensThe business update people had been asking for, and the day fundraising opened.4:16
10days until
demo day
LaunchAug 31We built a pharmaceutical factory to sell drugs on the internetNot a countdown episode. This is the RonanRx launch, and it did roughly twenty five times what the whole series did combined.1,694,028 views1:30
5days until
demo day
Day 5Sep 5The final stretchSeventy five meetings deep, in the last week before Demo Day.2:11

Follow along to see what happens next.