Investors will look at your technology, and they will look harder than you expect. Technical due diligence is now a standard part of most rounds, and a founder who cannot answer the questions confidently loses either the deal or the valuation. A fractional CTO brought in three to six months before you raise turns that from a risk into a strength. They fix what would have been found, and they answer for it in the room.
Here is what investors actually check, what a fractional CTO does before, during and after the raise, and the timeline that makes it work.
What investors actually check
Architecture and whether it will scale. Security and how you handle data. The quality of the code and the processes around it. Who owns the intellectual property. Key-person risk, usually whether the whole thing lives in one developer’s head. Technical debt and what it will cost to pay down. The team, and whether it can deliver the plan the money is for.
Nothing exotic, but every one of them has sunk a round when the answer was ‘we are not sure’. Our technical due diligence checklist sets out the full list investors work through.
What surprises founders is how much of it is about process and ownership rather than code. An investor’s adviser can forgive messy code with a plan. They cannot forgive not knowing who owns it, or discovering that the backups have never been tested, because those tell them something about how the business is run.
Why founders leave it too late
The raise is consuming. The deck, the model, the conversations, the second and third meetings. Technology feels like something to deal with when an investor actually asks. By then the adviser has a week, the founder is under pressure, and every finding becomes a negotiation point rather than a fix.
The founders who do this well treat technical readiness as part of preparing to raise, in the same way they prepare the financials. They would not go into a round with unreconciled accounts. The technology deserves the same care, and it takes longer to tidy.
What a fractional CTO does before the raise
Runs the diligence on you first. A proper internal review, the same questions an investor’s adviser will ask, so you find the problems before they do. This is the most valuable part, and it should happen at least three months out.
Fixes the cheap, ugly stuff. Missing documentation, no backups tested, credentials in the wrong place, licences unclear, a contractor who never signed an IP assignment. Most of what scares investors is cheap to fix and expensive to be caught with. A fortnight of focused work usually clears the worst of it.
Writes the honest story. A clear account of what you have, what it will need, and what the money buys. Investors forgive technical debt that is understood and planned for. They do not forgive surprises. A one-page technology summary and a dated plan for the debt turns a weakness into evidence of control.
Puts a senior name on it. Having an experienced CTO, even a fractional one, on the technology side of the data room changes how the deal is read. It says someone who has done this is accountable, and it gives the investor’s adviser a peer to talk to rather than a founder to interrogate.
What they do during the raise
They sit in the technical sessions and answer the questions. They handle the follow-ups from the investor’s adviser, which can run to dozens of detailed requests. They stop a nervous founder over-promising on a roadmap that would have to be walked back later. And they translate, in both directions, so the founder understands what is being asked and the adviser gets straight answers.
This is where the fee earns itself several times over. A technical session that goes well shortens the process and protects the valuation. One that goes badly adds weeks and a discount.
What they do after
A raise comes with promises, and the first board after close wants to see them being kept. A fractional CTO turns the pitch into a plan the engineering team can actually deliver, sequences the hires the money was for, and reports against it so the new investors see control rather than hope.
The first 90 days after a close are also when the new board forms its view of the leadership team. Clean technology reporting from day one sets that view in your favour.
A realistic timeline
Six months out. Fractional CTO starts. Internal review against the investor checklist. Findings written up, fixes prioritised.
Four months out. Cheap fixes done. Documentation, backups, access, IP assignments, licences. Technology summary and debt plan drafted.
Two months out. Data room technology section assembled. Roadmap sanity-checked against the team’s real pace. Founder rehearsed on the technical story.
During. Fractional CTO in every technical session, handling adviser follow-ups.
After close. Plan converted to delivery, hires sequenced, first board report.
Three months is the realistic minimum for the pre-raise work. Three weeks is damage control, and the findings will be negotiating points rather than fixes.
The common mistakes
Hiring an agency to ‘tidy up’ before the raise. Agencies fix what they are asked to fix. A fractional CTO works out what an investor will actually ask.
Hiding the debt. Advisers find it. Understood debt with a plan is fine. Hidden debt is a trust problem.
Over-promising on the roadmap. A pitch that says you will ship in six months what the team can do in twelve becomes a problem at the first board meeting. A fractional CTO keeps the roadmap honest.
Letting the one developer who knows everything run the technical sessions. They are a key-person risk, and putting them in front of the adviser tends to prove it.
The honest trade-off
Bringing someone in six months before a raise costs money at the moment you are trying to conserve it. The alternative is a diligence finding that knocks the valuation or stalls the round, which costs far more. A day a week for six months is a small fraction of the discount a bad technical session can cost.
Where to start
A technology review run against the questions an investor will ask, then the right amount of fractional CTO time to fix what it finds and stand behind it. The fuller explainer on technology due diligence sets out when a board should commission one. Start the conversation on our contact page well before the deck goes out.
Frequently asked questions
When should I bring in a fractional CTO before raising?
Three to six months ahead. Enough time to find and fix issues and write the technology story properly. Any later and you are reacting to findings rather than preventing them.
What do investors look for in technical due diligence?
Scalability, security, code and process quality, IP ownership, key-person risk and technical debt. The common failures are poor documentation, untested backups and unclear ownership.
Can a fractional CTO sit in investor meetings?
Yes, and they should. Having a senior technologist answer the technical questions directly is one of the main reasons founders bring one in before a raise.
What if the review finds serious problems?
Better you than the investor. Serious problems found three months out get fixed or planned. Found during diligence, they become discounts or deal-breakers.
Should I tell investors about technical debt?
Yes, with a plan. Investors expect debt in a growing business and respect a founder who understands it. What they punish is debt they discover for themselves.
Will investors mind that the CTO is fractional?
Usually not, provided the person is credible and the plan for full-time leadership is clear. Many investors prefer a strong fractional CTO to a weak full-time one at this stage.