How to Choose a Co-Founder You Won't Regret

You'll likely spend more time with your co-founder than with your spouse.

More emotionally intense experiences. Higher financial stakes. Harder challenges to navigate together.

And yet most founders reduce it to a checklist:

• Talented technologist
• Relevant experience
• Fills a gap
• Available

Good enough, let's go.

I've made that mistake myself. My first startup, my co-founder was much more of a go-go, don't trust people, work all the time kind of guy. My style is much more optimized for energy and balance. We weren't aligned and it caused huge tension.

Since then, I've seen lots of co-founder breakups and have coached many founders through the fallout. People's egos are involved, a lot of money at stake. It's hard to not have it be tense.

But it doesn't have to go that way. My best friend and I built a venture fund together where every single conflict has actually strengthened our relationship rather than the opposite. There's not even a whisper of a doubt that we want each other's good.

And the difference between these two outcomes boils down to knowing who to partner with and the foundation you set.

How to Actually Choose

Obviously you want complementary skills so you're each in your zone of genius with low overlap. A business person and a tech person tends to work well. The co-CEO thing very rarely works; even when it does, it's usually one person more internal, one more external.

But beyond the obvious, one of the most important factors in who you work with is something most people don't even think about: how do you actually feel about this person, especially when you're around them?

Do you find that they're one of the most inspiring people you've ever known? If yes, that's a great sign. You want to feel like you "married up."

Another thing that's often overlooked is whether your energy naturally rises or falls when you're around them. If you pay attention, you can attune to it. And it tends to be pretty consistent: people who give you energy tend to pretty consistently give you energy, and vice versa.

A good test for this: would you be psyched to be stuck in the Cleveland Airport with this person for hours?

Align on What You're Actually Building

Feeling great about the person isn't enough if you're not aligned on what you're building together, and how you want to build it.

This is where my first startup fell apart. We weren't misaligned on skill. We were misaligned on values and work style. But my second co-founder? I coached him and knew him deeply. So we were much more aligned around our values and how we communicated. And that difference changed everything.

So before you commit, get clear:

• Are we doing this to make money? Change the world? Grow as human beings?
• Does one of us want to build a multi-billion dollar venture-funded company while the other wants something closer to a lifestyle business?
• What do you want the experience of building to be like? Office or remote? Big team or small? Fun and enjoyable as a constraint, or willing to sacrifice everything?

Neither set of answers is wrong. But if they don't match, you'll be in tension about something neither of you can name.

A simple exercise I'd recommend: each of you write out your vision for working together, then share them. You'd be surprised what it surfaces.

Set the Foundation Early

Once you know you're aligned, you can set the foundation of your relationship.

One of the things Diana Chapman used to always say is that the key to thriving relationships is shared commitments and clear agreements. I think that's especially true of co-founders.

The word commitment comes from the Latin commiterre, meaning to gather your energy and move it in a chosen direction:

• A commitment to win-for-all, where making the other person's winning is as important as your own
• A commitment to candor (telling each other the truth)
• A commitment to take responsibility and not blame each other
• A commitment to practicing conscious leadership together

Clear agreements are the concrete expectations:

• Roles and responsibilities (who's doing what)
• Decision rules (what requires unanimous consent, what can each person decide alone)
• Effort expectations (are we 9-9-6 or 9-5?)
• Equity, comp, and how authority is distributed between co-founders

On all of these (especially foundational ones like equity, comp, and roles) really tune in to whether it feels good in your system.

I've seen co-founders where the equity split was a hero move: accepting 30-70 because the other person is more experienced, even though something inside felt constricted.

If you sense something feels off but convince yourself to just do it because you don't want to seem disagreeable, that can fester for years.

Founder Is Not a Role

One more thing most founders rarely ever acknowledge when forming a partnership.

Founder is not a role; it's a vestige of time. Just because you founded the company doesn't mean you're entitled to that seat forever. As companies grow, the non-CEO co-founder often gets leveled over time and ends up with a boss.

Have this conversation early: Is the non-CEO truly okay ceding authority? Does the CEO have the authority to decide about everyone's role, including letting go of the co-founder if they're not performing? Make clear agreements about how governance will work.

Subject both of you to vesting over four years or more. I've seen co-founders leave with a huge percentage of the company even though they didn't contribute that much.

At the beginning, you're bright-eyed and optimistic. But it's important to be grounded in reality. These things don't always work out, and good governance protects both of you.

Give It the Care It Deserves

Some couples do premarital counseling to hash out the tough issues before they commit. I think co-founders need something similar.

Because that's what this really is. You're choosing someone to navigate enormous pressure with, for years, around something you care deeply about. Give it that level of care.

And if you didn't do all of these things before choosing your co-founder, it's not the end of the world.

The best co-founder relationships aren't defined by avoiding conflict; they're forged through navigating it well.

When you do, every disagreement becomes an opportunity to learn and grow. That builds deep connection. And deep connection builds trust.

Trust is an efficiency multiple: it allows you to move fast, make decisions with confidence, and have each other's back when it matters most.

So stay tuned for an upcoming newsletter on how to maintain a healthy co-founder relationship once you're in it.

With love,

- Dave Kashen

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