The partner liked the deal. The numbers checked out. Then the founder gets an email: our technical advisor will run a session with your team next week, can you set aside two hours and give them read access to the codebase? For a non-technical founder, this is the moment the raise stops being about vision and starts being about whether the thing you built survives an expert looking at it directly.
Most founders prepare for the investor's questions. Fewer prepare for the person the investor sends to check the answers. That person is usually a working or former CTO doing this as an advisor, and they are very good at finding in twenty minutes the thing you were hoping nobody would ask about. Here is how that session actually works and how to walk into it ready.
Who they send and what they are actually checking
The technical advisor is not there to admire your architecture. They are there to answer one question for the partner: is the technology what the founder says it is, and are there any landmines that would make this a bad check. Everything they do in the session serves that question.
The three things they poke first
In my experience on the reviewer's side, a good advisor goes straight for the highest-signal areas. Can the team explain their own system clearly and consistently, or do the answers change depending on who is talking. Is there a single person the whole codebase depends on, so that the company has a key-person risk hiding in one engineer's head. And does the code match the story, or is the polished demo sitting on top of something fragile.
None of these require reading every line. They require asking a few sharp questions and watching how the team responds. A confident, consistent, specific answer builds trust. A vague or defensive one tells the advisor exactly where to dig.
It is a judgment call, not a checklist
Founders imagine diligence as a scorecard where you pass or fail on points. It is closer to an experienced person forming an overall read. They are weighing whether this team can be trusted to build the next three years of product, using the current system as evidence. That means your composure and honesty in the room matter as much as the code, which is good news, because those you can prepare.
How to prepare for the technical session
The best-prepared founders treat this like any other high-stakes meeting: they rehearse, they bring the right person, and they do not wing it.
Have your technical story straight and consistent
Before the session, make sure everyone who will be in the room tells the same version of how the system works, what its weaknesses are, and what the plan is. Inconsistency between a founder and an engineer is the single fastest way to lose a reviewer's confidence, because it suggests nobody actually owns the technical picture. Align beforehand. Name your known weak spots yourselves, the same way you would in the tech memo that carries you through diligence.
Bring senior technical presence if you do not have it in-house
If you are a non-technical founder without a strong technical lead, do not sit in that session alone. An advisor talking to a founder who cannot answer follow-up questions is a bad look, even if the product is fine. This is one of the clearest cases where a fractional CTO earns the fee: someone who can speak the reviewer's language, answer the sharp questions with specifics, and turn a potentially shaky session into a confident one. It is a different job from building the product, and it is the reason a fair number of founders bring one in specifically for a raise.
Give clean access and do not hide things
If they ask for repository access, give it cleanly and quickly. Fumbling access, or clearly having sanitized things at the last minute, reads worse than whatever they might have found. Advisors have seen real codebases. They are not expecting perfection. They are expecting honesty, and they will extend a lot of goodwill to a team that is straightforward about its warts.
If a technical session is coming and you do not have the person to walk into it with, that gap is worth closing before the meeting, not during it. You can book a call and we can prepare for the session, or sit in it with you.
FAQ
Who does an investor send to run technical diligence?
Usually a technical advisor, often a current or former CTO, retained to verify the technology matches the founder's claims and to flag any serious risks. They are not looking for perfect code. They are forming a judgment about whether the team and the system can be trusted with the next few years of building.
What does a technical diligence session focus on?
The highest-signal areas: whether the team can explain its own system clearly and consistently, whether the whole codebase depends on one irreplaceable person, and whether the code matches the story the founder told. Most of the read comes from a few sharp questions and how the team answers them, not a line-by-line audit.
I am a non-technical founder. Should I face the technical session alone?
No. Sitting alone in front of an expert who will ask follow-up questions you cannot answer undermines confidence even when the product is sound. Bring a strong technical lead or a fractional CTO who can speak the reviewer's language and answer with specifics. It is one of the clearest situations where senior technical presence pays for itself.
How do I prepare my team for a technical diligence call?
Align everyone on a single, consistent account of how the system works, what its weaknesses are, and what the plan is. Name your own weak spots before the advisor finds them. Prepare clean repository access in advance. Consistency and honesty build more trust in that room than any attempt to make the system look flawless.