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Younsub Jung
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How to choose a co-founder: the first decision in team building

Most startup failures begin with the team, not the idea. Patterns seen again and again across 8,000 matches.

2026.08.10· Younsub Jung·읽는 데 1분· younsubjung.com/blog/109

Hiring is what an already-running company does to fill an open seat. Finding a co-founder is finding someone to build with, sharing equity, at a stage when there is barely a company to speak of. The timing, the argument you make, and the things you have to verify are all different.

Four things to actually look at

Career and education are already on the resume. The reasons teams break apart are almost always somewhere else.

Set equity at the start and put it in writing

The most common mistake is putting off the equity conversation. It only gets settled properly while everyone still gets along. Put the contribution criteria, the vesting period, and the buyback terms for an early departure into a shareholders' agreement at the start, and you can protect the company later.

The point where teams fall apart

All three points are predictable. Set the rules in advance and most teams get through them.

Tags#Co-founder#TeamBuilding#StartupTeam#Equity#Startup
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