Bubble.io went 6 years with no titles at all, eventually the founders decided that co-CEO titles were the best way to show that the important decisions are made jointly. In practice, they have more clearly defined roles, so no one at Bubble has two bosses.
A 3 person company with C-level titles are kind of weird. You're too small for it to matter.
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From the Indie Worldwide November 19th meetup with featured guest Emmanuel Straschnov, Co-CEO and founder of Bubble.io - https://bubble.io/