Technical due diligence: what it checks, what fails, and how to be ready

If you raise investment, sell the business, or take on a major partner, your technology will be examined by someone whose job is to find what is wrong with it. That examination — technical due diligence — has a predictable shape. The companies that come through it well are not the ones with perfect technology. They are the ones who knew what would be checked and prepared for it. This is what it checks, what commonly fails, and how to be ready.

What due diligence is actually trying to establish

Behind every question is one concern: is this technology a safe thing to put money into, or does it hide risks and costs the buyer will inherit? The reviewer is not grading your code for its own sake. They are pricing risk. Everything they look at maps to a question about whether the technology will support the plan, survive without key people, scale with growth, and not spring expensive surprises after the deal. Understanding that lens is half of being ready — it tells you what your answers need to demonstrate.

What it checks

The areas are consistent across most reviews. Key-person risk: could the technology survive a critical person leaving, or does it all live in one head — the bus factor of one problem. Scalability: will the systems carry the growth the business is promising, or break under it. Technical debt: how much accumulated cost and fragility is buried in the systems, covered in what technical debt actually looks like. Security and compliance: whether there are exposures or regulatory gaps that become the buyer’s liability. And the integrity of the story: whether the technology matches the narrative the business is selling.

This is the same set of concerns covered from the investor’s side in what investors actually look for when they review your technology — this piece is the practitioner’s view of the review itself.

What commonly fails it

The failures are predictable, which is precisely why they are avoidable. Everything depending on one undocumented person. Systems that cannot scale and would need an expensive rebuild to grow. A pile of technical debt the founders did not know the size of, surfaced by the reviewer instead. Security gaps and compliance exposures nobody had mapped. And, most damaging to trust, a gap between what the pitch claims and what the technology actually is.

The common thread among failures is not that the technology was bad. It is that the founders did not know their own weaknesses, so the reviewer found them first, at the moment of maximum leverage against the valuation.

How to be ready

The way to be ready is to run the review on yourself before anyone runs it on you. A pre-diligence assessment looks at your technology the way a buyer’s team would, and finds the same things they would find — while you still have time to act. Some you fix. Some you cannot fix before the deal, but you can document, explain and put in context, so they become managed risks rather than ambushes. Either way, you control the narrative instead of reacting to theirs.

The difference between the two outcomes is timing. Found by you, a weakness is something you are managing. Found by them, it is leverage. The whole game is moving the discovery earlier.

Most companies find their weaknesses when the investor’s or acquirer’s team does. A pre-diligence review changes that, and it pays for itself many times over in the terms it protects. I will show you what will be checked, and where you stand, before it counts.

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• What the acquirer will find in your technology. Know before they do.