my fiancée and I are also co-founders. a while ago, we did a personality quiz together because we were curious if it could help us understand how we work, both personally and professionally. the interesting part wasn’t our similarities, but our differences. we’re both very high in openness and high in conscientiousness. the major divergence is neuroticism: hers is high, mine is relatively low. high neuroticism has costs, but it also increases vigilance. you detect threats, social tension and weak signals earlier. low neuroticism has costs too. you can underweight risks, but you’re better at remaining stable under uncertainty. I actually think the combination works quite well: she catches things I might miss. I’m less likely to overreact to the things she catches. maybe the better question isn’t “are we similar?” but “do our differences cancel out or compound?”