Inside The Hard Tech Startups Turning Sci-Fi Into Reality

TL;DR

YC partners describe how hard tech startups can succeed by thinking like software companies: breaking massive ambitions into small, cheap, fast milestones achievable in a 3-month batch with ~$500k. The key is to de-risk both technology (build a tiny working prototype) and commercial interest (secure large LOIs from credible buyers).

Key insights

• Hard tech founders must reframe from "I need $50M" to "how can I prove something with $500k in 3 months?" — this mental switch is critical and often happens in the second half of the batch.
• Commercial traction for hard tech means LOIs (letters of intent) for large contracts (e.g., $100M) not small MRR — these are credible when signed by real, diligent buyers.
• The "why you" question is central: founders must show they can execute faster and cheaper than incumbents (e.g., build a prototype in 3 months vs. 12 months, for $500k vs. $50M).