Guide 07
Preparing for Technical Due Diligence
The architecture, security, and tech-debt documentation investors ask for — assembled before a fundraise, not scrambled together after.
Quick answer
Technical due diligence rarely fails deals because of what it finds — it fails them because of the six-to-eight-week scramble to produce documentation that should have already existed. Assembling an architecture overview, security posture review, and prioritized technical debt list before a fundraise starts turns a multi-week diligence process into a multi-day one.
What investors actually request
An architecture overview: how the system is structured, what depends on what, and where the single points of failure are. Investors aren't looking for a perfect system — they're looking for evidence that someone understands the one they have.
A security and compliance posture review: authentication and access control practices, data encryption, incident response history, and progress toward relevant certifications (SOC 2, GDPR, HIPAA depending on sector). Gaps are expected at early stage; an inability to name them is not.
A technical debt inventory, prioritized by business risk, not engineering annoyance. Investors want to know which debt could slow the roadmap they're funding, not a complete list of every shortcut ever taken.
The preparation timeline that actually works
Start the documentation 60-90 days before a planned raise, not when the term sheet arrives. Diligence timelines compress fast once a lead investor is engaged, and scrambling to document architecture under deadline pressure produces worse documentation than doing it calmly in advance.
Assign one person — ideally whoever holds the CTO function, fractional or otherwise — as the single owner of the diligence package. A document assembled by committee from three different engineers' partial knowledge reads as exactly that to an investor's technical reviewer.
Run a practice review internally before the real one. The gaps that surface when someone unfamiliar with the system tries to follow the documentation are the same gaps an investor's technical diligence partner will find.
Frequently Asked Questions
How far in advance should we prepare for technical due diligence?
Start 60-90 days before a planned raise. Diligence timelines compress once a lead investor is engaged, and documentation assembled calmly in advance is consistently better than documentation produced under deadline pressure.
Does technical debt disqualify a company from investment?
Rarely on its own. Investors expect technical debt at early stage — what concerns them is a company that can't name its debt, prioritize it by business risk, or explain a credible plan to address the pieces that matter.
Who should own the technical due diligence package?
One person, ideally whoever holds the CTO function even on a fractional basis. Documentation assembled by committee from partial knowledge across multiple engineers reads as disorganized to an investor's technical reviewer, regardless of the underlying system's actual quality.