Security Due Diligence for Your Series A: What Investors Actually Ask

You're two weeks from your Series A term sheet. The lead partner introduces you to their "technical diligence" person. The first email has 23 questions about your security posture, data handling, and compliance certifications.

You have none of the things they're asking about.

This is happening earlier and more frequently than it used to. Five years ago, security due diligence was a Series B concern. Now it shows up at seed extensions and Series A. Why? Because investors have portfolio companies that got breached, and they learned that security debt compounds faster than technical debt.

Here's what they actually ask, what good looks like, and how to prepare without spending your entire runway.

What Investors Are Really Evaluating

Investors aren't looking for a Fortune 500 security program. They're evaluating three things:

Risk awareness: Do you know where your vulnerabilities are? A CTO who says "we have no security risks" is a bigger red flag than one who says "here are our top three risks and our plan to address them."
Proportional controls: Are you doing the basics well given your stage? MFA, encryption, access controls, and a documented incident response plan are table stakes.
Compliance trajectory: Are you on a path toward the certifications your target customers will require? You don't need SOC 2 at Series A, but you need a plan to get there.

The Questions You'll Get (and How to Answer Them)

Infrastructure and Cloud Security

"Describe your cloud infrastructure and security architecture."

Good answer: "We run on AWS. Production is in a private VPC with no direct internet access to databases. All data is encrypted at rest (AES-256) and in transit (TLS 1.2+). We use IAM roles with least-privilege access. CloudTrail logs all API activity to a locked-down S3 bucket with 1-year retention."

Red flag answer: "We use AWS. Our CTO manages it."

"How do you manage access to production systems?"

Good answer: "We enforce MFA on all AWS accounts. Production access requires assuming a time-limited role through our SSO provider. We review access quarterly and revoke within 24 hours of offboarding. We have break-glass procedures documented for emergency access."

Red flag answer: "Everyone has admin access so we can move fast."

Data Handling

"What customer data do you store, where, and how is it protected?"

Good answer: Data classification document showing what's collected, where it's stored, retention policies, encryption standards, and who can access it. Bonus points for a data flow diagram.

Red flag answer: "We store everything in our database."

"Do you have a data processing agreement (DPA) for your customers?"

If you handle any personal data from EU customers, you need this. If you don't have one, say you're building it — don't say it's unnecessary.

Incident Response

"What happens when you discover a security incident?"

Good answer: A documented incident response plan with clear roles, communication templates, severity classifications, and a post-mortem process. Even better if you can reference a past incident you handled well.

Red flag answer: "We'd figure it out."

Compliance and Certifications

"Do you have SOC 2? When do you plan to get it?"

At Series A, "we're starting the process and plan to have Type II within 12 months" is a perfectly acceptable answer. "We don't need it" is not — even if it's true today, your enterprise customers will require it.

If you want to understand what SOC 2 actually costs and involves, that context helps you give a more specific timeline.

Third-Party Risk

"How do you evaluate the security of your vendors and third-party tools?"

Good answer: "We maintain a vendor inventory and evaluate security posture before onboarding tools that handle customer data. We review SOC 2 reports or equivalent for critical vendors and reassess annually."

Red flag answer: "We use whatever tools the team likes."

People and Process

"Do your employees receive security training?"

Yes, even if it's a 30-minute annual session covering phishing awareness, password hygiene, and acceptable use. Document it.

"Do you have security policies?"

At minimum: Information Security Policy, Access Control Policy, Incident Response Plan, and Acceptable Use Policy. They don't need to be long. They need to reflect what you actually do.

The 2-Week Prep Playbook

If you're about to enter diligence and your security posture is light, here's what to prioritize:

Week 1: Get the Basics in Place

[ ] Enforce MFA on AWS, GitHub, Google Workspace, and your SSO provider
[ ] Verify encryption at rest on all databases and storage
[ ] Document your current cloud architecture (a diagram goes a long way)
[ ] Write a data classification document: what you store, where, how it's protected
[ ] Create a vendor inventory of all tools that handle customer data

Week 2: Policies and Plans

[ ] Draft four core policies: Information Security, Access Control, Incident Response, Acceptable Use
[ ] Document your change management process (PR reviews → CI → deploy)
[ ] Schedule your first quarterly access review
[ ] Create a security roadmap showing your path to SOC 2 (timeline + milestones)
[ ] Prepare a 1-page security overview document for the investor's diligence team

What You Can Skip

Penetration testing: Nice to have, not expected at Series A. If you have one, share the results. If not, plan for one post-close.
SOC 2 report: Not expected at this stage, but having a timeline is.
Full-time security hire: Investors understand that a fractional CISO makes more sense at this stage.
Security Operations Center: Way too early. Centralized logging with alerts is sufficient.

How Security Posture Affects Your Valuation

This is the part nobody talks about explicitly, but investors factor it in:

Strong security posture signals operational maturity, reduces perceived risk in the portfolio, and means fewer post-close surprises. It won't increase your valuation, but it removes a potential discount.

Weak security posture doesn't kill deals by itself, but it shows up in two ways:

Extended diligence timelines that delay close
Post-close requirements written into side letters ("must achieve SOC 2 within 12 months of close")

The worst outcome: discovering a security gap during diligence that triggers a re-price or a competitor getting the term sheet while you scramble to patch holes.

The Fastest Way to Get Ready

You have two options:

Option A: DIY. Use the 2-week playbook above. Works if your CTO has done this before and has the bandwidth to own it alongside the fundraise.

Option B: Get an advisor. A fractional security advisor who's been through dozens of startup fundraises can prep you in 3–5 days. They know exactly what diligence teams look for and can help you present your current posture in the strongest possible light — without fabricating anything.

Book a free discovery call — I'll review your current security posture and tell you exactly what to prioritize before your diligence process starts.

— Sean, Founder at Wizbang