Technology Due Diligence: What Investors Look For
Before writing a check, investors evaluate your technology. Here's what they look for — and what technical founders should prepare before fundraising.
Strategic Systems Architect & Enterprise Software Developer
Technology Due Diligence: What Investors Look For
Technology due diligence is the process investors use to evaluate the technical foundation of a company before investing. It answers a simple question: can this team build what they are promising with the technology they have?
I have participated in due diligence processes on both sides — as the technical founder being evaluated and as the technical advisor conducting the evaluation. The companies that pass due diligence smoothly are not necessarily the ones with the most sophisticated technology. They are the ones that can clearly articulate their technical decisions, demonstrate that their architecture supports their growth plan, and show that their engineering practices are sustainable.
What Gets Evaluated
Due diligence covers several dimensions of your technology operation. Each one tells investors something specific about risk.
Architecture and scalability. Can your current architecture support 10x your current user base without a rewrite? Investors are not expecting you to have already built for massive scale, but they want to see that you have thought about it. A monolithic application with clear boundaries that can be decomposed into services is fine. A monolithic application with tangled dependencies that will require a six-month rewrite to handle growth is a red flag.
Document your architecture — a clear diagram showing services, databases, external dependencies, and data flow. Explain the trade-offs you made and why they were appropriate for your stage. If you chose a simple architecture because you are pre-product-market-fit and speed matters more than scalability, say that. It demonstrates maturity.
Code quality and engineering practices. Investors will often have a technical advisor review your codebase. They are looking for consistent coding standards, reasonable test coverage, meaningful code review practices, and absence of obvious security vulnerabilities. They are not looking for perfection — they are looking for evidence that your team writes maintainable code.
The biggest red flag in code review is not a specific bug. It is the absence of automated quality controls. No tests, no linting, no CI/CD pipeline, no code review process — this tells investors that the team ships whatever they write without verification. The technical debt accumulated in this environment compounds rapidly.
Security posture. How do you handle authentication, authorization, and data protection? Are secrets managed properly or hardcoded in the repository? Do you have a process for addressing security vulnerabilities in dependencies? Investors increasingly care about security because breaches destroy both user trust and company value. A basic security review that covers the OWASP Top 10 demonstrates awareness.
Team and knowledge distribution. Is critical knowledge concentrated in one person? If your entire backend architecture is understood only by a single engineer, that is a key-person risk. Investors want to see knowledge distributed across the team through documentation, code review practices, and shared ownership of critical systems.
Preparing for Due Diligence
Preparation should start long before you are in fundraising conversations. The best time to build good practices is when they are easy to implement, not when an investor is asking for evidence of them.
Document your architecture decisions. Maintain Architecture Decision Records that explain why you chose your database, framework, hosting provider, and other significant technical choices. These do not need to be formal — a paragraph explaining the decision and its rationale is sufficient. The existence of these documents tells investors that your technical decisions are deliberate, not accidental.
Maintain a dependency inventory. Know what third-party services and libraries you depend on, what they cost, and what your fallback plan is if one becomes unavailable. Investors will ask about vendor concentration risk — if your entire application depends on a single third-party API with no alternative, that is a risk they need to understand.
Track your technical debt. Every codebase has technical debt. Investors do not expect otherwise. What they want to see is that you know where the debt is, you have a plan for addressing it, and it is not accumulating faster than you can pay it down. A prioritized list of known issues with estimated remediation effort demonstrates control.
Have your infrastructure documented. How is the application deployed? What happens if a server fails? How are backups managed? How do you handle incidents? These operational questions are part of due diligence because they tell investors whether your technology operation can sustain the growth that their investment is intended to fund.
Red Flags That Kill Deals
Certain findings during due diligence will significantly reduce investor confidence or kill the deal entirely.
No version control or no meaningful commit history. If your code is not in Git with a meaningful history of changes, investors question whether the team has basic engineering discipline. Similarly, a commit history that shows one person making all commits for the past twelve months raises team questions.
Plaintext secrets in the repository. Database passwords, API keys, and encryption keys committed to the code repository signal a fundamental security gap that puts customer data at risk. This is one of the easiest problems to prevent and one of the most damaging when found during due diligence.
No automated testing. Some investors tolerate low test coverage in early-stage companies, but no testing infrastructure at all is a different signal. It suggests that the team ships code without any verification beyond manual testing, which becomes unsustainable as the codebase grows.
Undisclosed third-party IP issues. Using open-source libraries with copyleft licenses in proprietary software, or incorporating code from previous employers, creates legal liability that investors must understand. Disclose these proactively. Discovering them during due diligence feels like concealment, even if it was an oversight.
Architecture that cannot support the business plan. If your pitch deck projects ten million users and your architecture uses SQLite on a single server, the gap between ambition and technical reality undermines your credibility. Your architecture does not need to be built for ten million users today, but the path from current state to projected scale should be plausible.
Due diligence is not an exam you pass or fail. It is a conversation about risk, capability, and trajectory. Investors expect imperfections in early-stage technology — they are investing in potential. What they cannot accept is unacknowledged risk, undocumented decisions, and engineering practices that will not scale with the investment they are making.