Finding a Co-founder

Based on YC guidance.

The right mindset

The most important thing to internalise: the person matters more than the idea. First-time founders are typically wedded to their idea; experienced founders know the idea is just the start of a long journey. What you're really doing is asking someone to go on an adventure with you — and that's a genuinely compelling pitch, because most people never get offered one.

A secondary signal worth heeding: if you're really struggling to find anyone to work on your idea, that's a sign the idea may not be compelling enough. There are plenty of other great ideas.

What to look for:

• Someone you trust above all else
• Someone who handles stress well — figure this out before you commit
• Aligned goals and values; understand what motivates them
• Someone you'd genuinely want to be friends with
• Someone who works on projects at weekends because they want to, not because they have to

The "complementary skills" myth:

The standard advice — find someone with complementary skills — is oversimplified. Many of YC's best founding teams are made up of very similar people. Similarity often produces trust and ease of working together, which matters more than covering every skill base. Technical depth in a niche isn't always necessary; someone willing to learn and to take on the unglamorous tasks is often more valuable.

Raising the bar:

Because finding a great technical co-founder is hard, founders sometimes settle for anyone who can build the product. That's a mistake. You want someone you respect as an intellectual equal — someone who could grow into a CTO running the whole technical side of the company.

Avoid expanding the founding team just to add headcount or cover more skills. Adding people who don't know each other well increases risk and complexity more than it adds value.

Where to find people

• Start with friends and existing network — if they say no, ask who they'd recommend
• Go to hackathons or contribute to open source projects
• Find people with the same interests as you

On timing: the median time between joining YC's co-founder matching platform and finding a match is 100 days. Several founders took over nine months. Go in with patience.

On ideas during the search: be flexible. Ideas are a dime a dozen. Ask people what they're working on and what problems they see. Your eventual company will probably look different from what you start with anyway.

Before you commit

Do projects together first. Set a deadline, build something small, and see how you work. The more time you spend working together, the clearer the answer will be. A co-founder relationship requires a far higher degree of trust than a typical hire — treat the evaluation accordingly.

On location: remote work is common, but starting a company requires more trust and commitment than a normal employment relationship. If you're in different cities, get on a plane early. If neither of you is willing to relocate to be in the same place eventually, it's probably not the right match.

Red flags to watch for:

• The CEO title discussion becomes a difficult or fraught conversation
• Neither person is willing to relocate to close the distance
• They show poor stress responses before you've even launched

Equity split

The goal of the equity split is to maximise long-term motivation, not to reflect short-term contributions. Get this right early.

YC's position: YC considers the equity split between founders an important factor when evaluating a company for funding. Their definition of co-founder is 10% equity as an absolute minimum.

Vesting protects both sides. The standard structure is:

• 4-year vesting — equity is earned over four years
• 1-year cliff — if someone leaves or is let go within the first year, they receive nothing

This is your hedge. It makes it safer to be generous with equity upfront, knowing you have a structured way to handle early departures. Given how hard it is to work closely with someone over years, having this protection should make you more willing to split generously — not less.

Founder breakups are common. Vesting doesn't prevent them, but it limits the damage.

The work trial

The only reliable way to know if you work well with someone is to actually work with them.

Recommended length:

• In-person, full-time: 1–2 months
• Remote or part-time: adjust proportionally — remote part-time for 6 months tells you much less than in-person full-time for 6 weeks

Before starting a work trial, agree on what happens to the ownership of anything you build together if you decide not to continue. Having that conversation upfront avoids a harder one later.