Essay · ~10 min read

My co-founder and I broke up. Here's a post-mortem.

Yiren Lu · yirenlu.com Free Beginner

An unusually honest first-person autopsy of a co-founder split, and it names the warning signs our answer says to catch early. Lu traces the break not to a blowup but to quiet, compounding divergence: one wanted to build something huge, the other wanted something of her own; their passions rarely overlapped; both were backend engineers with nobody who could sell. Read it as the drift you are describing, played all the way out, so you can name yours out loud before it hardens.

• Co-founder breakups usually come from slow divergence in what each person actually wants, not a single dramatic fight, so surface the mismatch early.
• Different working styles (data-driven versus instinctive) quietly generate friction on every decision until someone names it directly.
• A misaligned definition of 'success' between founders is a structural crack, not a personality quirk, and it will not resolve itself.