How to Evaluate a Business Partner Before Signing: 5 Signals Contracts Don't Capture

How to Evaluate a Business Partner Before Signing: 5 Signals Contracts Don't Capture

You've found the right person, the skills fit perfectly, the vision seems aligned, the numbers add up, and the lawyer is already preparing the drafts. But suddenly all those warnings come back to mind: "companies are made in odd numbers less than 3," or "Don't you remember what happened with those two?" Something tells you to go slow, and that something is right.

Contracts serve their purpose—they define shares, responsibilities, exit clauses, and non-compete agreements, protecting you from scenarios you can anticipate. The problem is that real issues with a partner rarely fall within those scenarios, because they arise from who that person truly is, not from what they signed.

Financial due diligence tells you if the numbers add up, legal due diligence tells you if there are skeletons in the corporate closet, but neither tells you how that partner will behave when things go wrong, when there's less to divide than hoped, when one of you must yield on something important. For that, you need another type of analysis—behavioral due diligence.

The Cost of Getting It Wrong

Before diving into the signals to observe, it's worth pausing on the numbers because they show how high the stakes really are.

The data specifically concerning startups and companies founded together: according to Noam Wasserman, professor at Harvard Business School who studied over ten thousand founders for his book "The Founder's Dilemmas," 65% of high-potential startups fail due to conflicts between co-founders. Not for lack of market, not for product problems, but for problems between the people who founded them.

Anyone who has lived through a difficult corporate separation knows it well: you would have paid much more, at the beginning, to know how it would end.

The 5 Patterns to Observe

Here's what to look for in a potential partner, beyond the resume and references.

How They React Under Pressure

When everything is going well, everyone is an ideal partner—the real question is what happens when things get complicated. When an important client leaves, when an investment underperforms, when costs need to be cut or unpopular decisions need to be made.

You can't always simulate these situations, but you can observe indirect signals that emerge even in daily interactions. How do they handle small setbacks during your conversations? How do they react when you point out a problem in their proposal or question an idea they care about? Do they stiffen and become defensive, minimize and change the subject, attack your objection, or process and integrate the feedback?

The way a person handles small frustrations is predictive of how they'll handle major crises, because under pressure we don't become different people—we become more concentrated versions of who we already are.

How They Talk About Past Failures

Everyone has failed at something—the question is how they talk about it.

Someone who says they've never failed at anything is either lying or has never risked enough to learn anything significant. Someone who attributes every failure to external factors—bad luck, wrong partners, adverse market conditions—is telling you they'll do the same with you when something goes wrong, because in their narrative, they're never part of the problem. Someone who can explain what didn't work, what they would have done differently in hindsight, and what they learned from that experience is demonstrating a capacity for reflection and self-criticism that is essential in a partner.

You're not looking for someone who flagellates themselves or carries the weight of every past mistake like a sentence—you're looking for someone who can look back with clarity and distinguish between what they could control and what they couldn't.

How They Treat People Who Can't Help Them

This is one of the most reliable and most overlooked signals, perhaps because it requires observing when the other person doesn't know they're being watched.

Watch how they behave with the waiter at the restaurant, with the assistant who brings you coffee, with the taxi driver, with people who have nothing to offer them and nothing to take from them. Not in an obvious way, of course—no one is rude when they know they're being examined. Look at the nuances: tone of voice, level of attention they give, patience when something doesn't go as expected, whether they say thank you or take things for granted.

A person who changes their approach based on the usefulness of their interlocutor is showing you exactly how they'll treat you when, one day, you no longer have anything to offer them or when your interests diverge.

Consistency Between Words and Actions Over Time

Words cost little, promises even less—what matters is whether over time what a person says corresponds to what they do.

This requires patience, requires not closing everything in two weeks of mutual enthusiasm, requires carefully observing what happens between meetings. Do they keep commitments, even small ones? Do they arrive on time or is there always an excuse? When they say "I'll send you that document tomorrow," do they really send it tomorrow? When they promise to do something, do they do it without you having to remind them?

Small inconsistencies are predictive of large inconsistencies, because they reveal how that person manages the gap between intentions and actions. If already in the courting phase, when everyone is trying to show their best side, you notice gaps between statements and behaviors, you can multiply by ten what you'll see when you're in it together and pressure rises.

What Really Motivates Them, Beyond Money

This is perhaps the most important signal and also the hardest to read, because people are rarely aware of their deep motivations, and even when they are, they don't always declare them openly.

Money is a legitimate and understandable motivation, but it's rarely the only one and almost never the one that really determines decisions at crucial moments. Some people seek recognition and visibility, others seek control and autonomy, others still the possibility of building something lasting, and others want to prove something to someone—perhaps a parent, a former partner, or themselves.

None of these motivations is wrong in itself—the problem arises when two partners' deep motivations are incompatible without either realizing it. If you want to build something to pass on to your children and they want to sell to the highest bidder within five years, it's not a problem of values or ethics—it's a problem of structural incompatibility that no contract can solve and that will emerge at the worst possible moment.

Why References Are Almost Useless

At this point someone will think that all you need to do is ask for references, talk to people who've worked with them, make some phone calls.

Sure, you can do that, and it's right to do it, but you must consider a fundamental fact: whoever is presented to you as a reference is someone your potential partner has carefully chosen. They've selected people who will speak well of them, who've had positive experiences, who've remained on good terms. It's like judging a restaurant by reading only the five-star reviews the owner has put in the window, ignoring everything else.

The really useful references are the ones you find yourself, with a bit of work and networking. Former partners with whom things didn't go well, former employees who left, people who dealt with them when things went wrong and the masks came off. They'll never introduce you to those people, and those are precisely the ones who would have the most to tell you.

When to Trust Your Gut

Instinct isn't magic or superstition—it's your brain processing signals you can't yet articulate rationally. When something doesn't convince you and you can't explain why, there's usually a reason you haven't yet brought to conscious level—a series of micro-observations your nervous system has recorded but your rational mind hasn't yet processed.

The problem with instinct is that it can be polluted, and often it is precisely in situations where you'd most need it to work well. It can be polluted by enthusiasm for the opportunity in front of you, by the pressure to close quickly, by the personal sympathy you feel for that person, by the desire to see your hopes confirmed.

Instinct works best when you've already seen many similar situations and accumulated a database of experiences to draw on unconsciously. If this is your first major partnership, or if you've never seen a partnership go wrong up close, your database is limited and your instinct may not have enough material to work with.

This is where structured analysis comes in—not to replace instinct but to give it a framework, to know what to observe, how to interpret what you see, how to distinguish a real signal from background noise. That's what we do at Delphyros when an entrepreneur asks us to help them understand who they really have in front of them before signing something important: we read behavioral patterns, inconsistencies between verbal and non-verbal, signals that indicate how that person will behave when the stakes rise. Not to decide for you, but to give you information you wouldn't otherwise have, to flip that information asymmetry that usually works against those who must choose to trust.

A Final Reflection

The paradox of partnerships is that you evaluate them at the worst possible time: when you're enthusiastic, when you only see possibilities, when the other person is showing their best version and you're showing yours. It's like choosing who to marry based only on first dates, when everyone is at their peak of charm and availability.

The signals are always there, from the beginning. The question is whether you have the tools to read them and whether you give yourself the time to do so, resisting the rush to close and the enthusiasm that pushes you to see only what you want to see.

Next time you're about to sign with someone, stop for a moment. Beyond the numbers and contracts, ask yourself: do I really know who I have in front of me? Do I know how they'll behave when things go wrong, when we have to divide something, when our interests are no longer perfectly aligned?

If the answer is no, maybe it's worth finding out first.