YC Co-Founder Matching — 150,000+ profiles, and how to actually find one who ships.

What the platform is

YC Co-Founder Matching lives at startupschool.org/cofounder-matching. You build a profile — skills, industries you want to work in, working style, location, whether you're technical or business — and swipe through other profiles. When two people mutually match, a chat opens.

The platform has 150,000+ active profiles as of 2025. It's the same infrastructure YC uses for Startup School, so your profile is portable across both.

The 3-stage vetting process founders actually use

1. Weekly video calls (weeks 1–3). Not "coffee chats". Discuss a specific problem you're both interested in. Test whether your reasoning styles fit under mild disagreement.
2. Two-week trial project (weeks 4–5). Ship something small together. A landing page, a prototype, ten user interviews. YC partners are unanimous on this: skip it and you're gambling.
3. Formal co-founder agreement (week 6). Equity split (see our equity split guide), vesting, IP assignment, exit clauses. Draft it before you incorporate.

Profile mistakes that kill your match rate

• Vague skills. "Full-stack engineer" is invisible. "Shipped Postgres migrations at $50M ARR SaaS" gets matches.
• Idea-locked. If your profile says "must work on my crypto agent idea", 95% of quality profiles won't swipe. Signal interests, not a locked-in thesis.
• Weak time commitment. Marking "part-time / hobby" filters out anyone serious. If you're not ready to commit, the platform isn't the bottleneck — you are.
• No portfolio link. Add GitHub, published writing, or a Loom demo. Text profiles get 5x fewer matches than profiles with links.

If you can't find a co-founder

Solo is a real option in 2026. YC has funded 40+ solo founders since W24. See our YC Solo Founder Database for the pattern of who gets in without a co-founder. The short version: strong technical + strong operator, existing product with users, and a coherent answer to "why solo?"