Y Combinator co-founder matching, niche Discord servers, r/cofounder, university alumni, and #buildinpublic Twitter. Past coworkers have the highest hit rate. Always run a 4-week trial project before formalizing.
Sources: (1) Y Combinator co-founder matching — free, vetted. (2) Niche Discord servers in your industry. (3) r/cofounder subreddit. (4) University alumni networks. (5) #buildinpublic Twitter community. (6) Past coworkers — highest hit rate. Always: run a 4-week paid or unpaid trial project. Watch for ego, blame-shifting, over-promising under stress. Default to 50/50 equity with 4-year vesting and 1-year cliff.
Stripe (Patrick + John Collison): brothers, years of building together
Airbnb: roommates with months of side-project history before formalizing
Default yes unless one contributes asymmetric capital or time. Equal equity reduces resentment.
Not always. Solo is fine with discipline + distribution.
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