Startup Due Diligence: A 30-Minute First-Pass Screen

Brian Nichols is the co-founder of Angel Squad, an angel investing community where aspiring and active angels learn from Hustle Fund’s approach, review curated deal flow, and connect with peers.

Your workday may leave room for one founder conversation, while the pitch leaves you with a dozen unanswered questions. A focused first meeting can make that time useful. A 10/10/10 workflow helps you organize the conversation, separate evidence from assumptions, and choose where to spend your limited diligence time.

Where a 30-minute screen fits in startup due diligence

Startup due diligence is the investigation of a company and its proposed investment, including the evidence behind its claims and the risks you'd take on. A first-pass screen decides whether a deal deserves more of that work.

Thirty minutes can surface a strategy mismatch, a material unanswered question, or a reason to continue. It cannot establish that the company is a sound investment or that you're ready to send money. Customer evidence, financial records, ownership, terms, and specialist questions still need substantive review.

The U.S. Securities and Exchange Commission (SEC) highlights limited disclosure, illiquidity (difficulty selling the investment), and the possibility of losing your entire investment in its private-placement guidance. A persuasive meeting doesn't remove those risks.

Before the call, have your own limits in writing: the stages and sectors you understand, the money you can afford to lose, and the time you can give to further diligence. Our guide to startup investment criteria helps make those limits concrete.

Ask the founder to send an existing deck and recent operating figures ahead of the meeting. Missing material stays an open question. There's no need to commission a financial model to begin a conversation.

First 10 minutes: understand the business and its current state

Give the founder room to explain the problem, the customer, and what the company does. Ask how they came to work on it and what they learned from the people who experience the problem.

Get to a description you could repeat to someone else: “This company helps this customer solve this problem, and this person pays for it.” If you can't describe the business yet, ask for a concrete customer example. An unfamiliar industry may need more explanation; a polished pitch isn't proof of a better business.

Use the rest of this block to establish what exists today:

• Product: Is there an idea, prototype, working product, or product already in use? A short demonstration can show the current workflow. It won't establish reliability or technical feasibility at scale.
• Customer activity: Are the named customers paying, trying a free pilot, discussing a purchase, or expressing interest? Keep those categories separate.
• Recent progress: What did the team build, sell, or learn recently? What changed because of that work?
• Financing purpose: What is the team raising money to accomplish, and which milestone would that money fund?

Label each note by its source. “Founder reports three paying customers” is different from “I saw three signed contracts.” A deck, a demonstration, and a founder answer each tell you something. They don't independently establish every claim.

Next 10 minutes: ask whether the team can build, sell, and scale

These three questions give the conversation a useful shape. You won't cover every follow-up in ten minutes. Start with one question in each category, then spend the remaining time on the largest gap.

Can this team build the product?

Ask: “What have you built so far, who built it, and what's the hardest part still unresolved?”

Relevant evidence includes work the founders can show, their explanation of technical constraints, and a specific example of changing the product after customer feedback. Prior experience is useful when it explains how they'll solve this company's problem.

First-time founders and founders with academic backgrounds can have relevant skills. If a technical co-founder is missing, identify who supplies the capability this business needs and what happens if that person or supplier leaves. A research-led product may require scientific validation; ordinary workflow software may have a different bottleneck.

If the core claim exceeds your expertise, record the need for an independent technical or scientific assessment. Confidence in the founder can't fill that gap.

Can they sell this product?

Ask: “Who's the customer, why do they care, and how will you reach your first customers?” Then ask what happened when the team tried that approach.

“We'll sell through our network” needs detail. Which buyers did they approach? Who responded? What prevented a purchase? Who controls the budget? What does the customer use today, including the option to do nothing?

Companies that haven't earned revenue yet can have useful evidence: repeated customer conversations, product use, or a pilot with a defined buying process. Interest alone leaves willingness to pay unresolved. Early sales through personal relationships also leave the next question open: whether the company can reach buyers outside that network.

Can this become a business at the scale you're seeking?

Ask: “If the initial customer segment works, how does the company grow from there, and what becomes harder as it grows?”

Look for a connection between a reachable customer group, how the company earns money, and a plausible expansion path. A large industry number doesn't explain how this team gets customers or serves them economically.

For a hypothetical software company, adding customers might create heavy implementation work. For a marketplace, growth might depend on attracting buyers and suppliers in the same place. Those are questions about the model, rather than automatic reasons to reject the category.

Ask what the founders want to build and how much additional capital that path may need. A durable small business and a company pursuing rapid venture-scale growth can require different financing and exit plans. The founder's goal needs to fit your investment goals. A venture fund's pass doesn't establish that a business is bad, and an attractive business doesn't establish attractive investment terms.

Final 10 minutes: address the biggest concern and choose the next step

Name the uncertainty most likely to change your view. Be specific: “I understand why the first customers bought, but I don't yet see how you reach customers who don't know you.”

Ask the founder what supports their answer, what remains unproven, and which existing record or further conversation could help. A willingness to acknowledge uncertainty is useful. One calm response doesn't prove coachability, and one tense response doesn't establish a character flaw.

Give more weight to the substance. Does the answer address the concern? Do the figures stay consistent? Does the founder distinguish customer feedback from their own expectation? Can they explain a setback and what they changed?

Reserve the last few minutes for one of three outcomes:

1. Pass: The deal is outside your strategy, the risk is beyond your capacity, or the evidence already gives you a reason to stop. State that reason. “Outside my expertise and no suitable specialist available” is a legitimate pass; it isn't a verdict on the founder's potential.
2. Clarify: A specific missing answer could change whether you continue. Request that answer and agree on a follow-up date. “Please separate paid customers from unpaid pilots in the figures you sent” is more useful than “Send more traction.”
3. Advance to further diligence: The company fits your initial criteria and has enough supporting evidence to warrant more work. Name the next investigation and its owner. This outcome authorizes more investigation only. It is not investment approval.

Keep a short screen record with four lines:

• Outcome and reason: Pass, clarify, or advance to further diligence, with the fact or limit driving that choice.
• Evidence: The strongest observation and its source, clearly separated from founder-reported claims.
• Unknown: The most important unresolved question, plus any other material risks that surfaced.
• Next action: The evidence needed, who will obtain or assess it, and the follow-up date.

Our co-founder and general partner Elizabeth Yin writes in Democratizing Knowledge (2021, p. 131), “The more disciplined you are in your thought process/rubric, the more you can improve over time.” A short record preserves your reasoning before later events change how you remember the meeting.

A first-pass example with an unresolved customer claim

Consider a hypothetical founder selling scheduling software to independent clinics. You see a working demonstration. The founder describes ten clinics as customers and says referrals will drive growth.

During the questions, you learn that two clinics pay and eight are trying the product free. The demonstration supports the claim that a product exists. The customer count still needs clearer definitions, and referrals remain an assumption about distribution.

Your screen record might say:

• Outcome and reason: Clarify. The customer claim combines paid accounts and free pilots.
• Evidence: Working scheduling flow observed in the meeting; paid-account count reported by the founder.
• Unknown: Why clinics pay, whether they keep using the product, and whether referrals bring additional paying buyers.
• Next action: Founder sends dated paid-account and pilot figures before an agreed follow-up. If those support continuing, arrange customer conversations with permission.

The next result could lead to a pass or to further diligence. Even encouraging customer evidence would leave financial, ownership, technical, and investment-term questions open.

Use professional experience without treating familiarity as proof

Your day job can help you notice implementation friction, a missing budget owner, or a sales assumption that doesn't match how buyers behave. Name that observation and the experience behind it. Keep the boundary of that experience visible too.

As Elizabeth Yin writes in Democratizing Knowledge (2021, p. 43), “Investors use their life perspective to assess.” Another investor may see a constraint you missed or question a familiar assumption.

Gut feelings belong in the question list. Psychologists Daniel Kahneman and Gary Klein's research on intuitive expertise explains that reliable intuition depends on an environment's predictability and opportunities to learn its patterns. Feeling certain doesn't establish accuracy.

Turn “something feels off” into an observation you can discuss: a revenue figure changed, the product demonstration didn't match the claim, or the founder avoided a question. Accent, confidence, pedigree, and similarity to you don't answer whether the business works.

In Angel Squad, our angel-investing community, members learn from investor-led deal reviews and compare questions with peers. That gives you other perspectives on your reasoning while leaving the decision with you.

Our community at a local meetup.

An advance outcome starts the deeper review

Arrange the next work around the material questions the screen uncovered. Customer conversations can explain the buying decision. Financial and product records can substantiate reported activity. Qualified specialists can assess technical, legal, or regulatory risks you can't evaluate yourself.

Our full due diligence checklist covers the deeper document, ownership, terms, and risk review before an investment decision. Two customer calls and a quick glance at the terms don't create a universal shortcut through that work.

Tell the founder what you need and when you'll respond. If the round closes before a material question can be resolved, passing remains available. The SEC warns against sales pressure that pushes investors to act without adequate information.

To practice founder evaluation alongside other investors, apply to Angel Squad.

This material is educational and is not investment, legal, or tax advice. Startup investments are speculative, illiquid, and long-term; many may fail, and you could lose your entire investment. Seek independent review from qualified legal and tax professionals for the documents and circumstances of a proposed investment.