I have shipped AI systems into multiple Fortune 100 customers over the last several years. The pattern of what makes the deployment succeed or fail looks very different from what the vendor sales motion would suggest, and I think it is worth writing down for the founders and engineers who are about to attempt it.
The buyer is not the user
Inside a Fortune 100 organisation, the person who signs the contract is not the person who will use the system. They may not be in the same building. They may not be in the same country. The signature lives at the level of a CIO or chief data officer. The use lives at the level of an analyst, a nurse, a customer support agent, or an underwriter.
Vendors who ship to small businesses can sell features. Vendors who ship to Fortune 100 customers have to sell two things at once. They have to sell control to the buyer and value to the user. Those are different sales, with different evidence, and they happen at different points in the process.
Procurement is the architecture
Procurement at a Fortune 100 customer is not a step. It is the shape of the deal. By the time the procurement team is satisfied, your security questionnaire has run to a hundred and forty pages, your data residency story has been examined, your SOC 2 report has been read in full by somebody who knows what to look for, your model versioning policy has been documented, and your incident response plan has been reviewed.
None of this is theatre. All of it is the buyer's way of asking the question, can we trust your system not to embarrass us in front of our regulator, our customers, or our board. The vendors who answer those questions cleanly close the deals. The vendors who treat procurement as friction lose the deals.
The pilot has to be a real pilot
Fortune 100 customers will run a pilot. They will not, in my experience, take a vendor system into production without one. The pilot will be smaller than you expect, will be scrutinised more than you expect, and will have to deliver a measurable business outcome.
The mistake I see vendors make is to treat the pilot as a sales demo. They optimise for the wow moment and skip the operational evidence. The buyer's procurement team is not looking for a wow moment. They are looking for evidence that the system can be operated by their team, integrated with their stack, and rolled back if something goes wrong. The pilot is the evidence-gathering exercise. The vendor that treats it that way wins.
Integration is most of the cost
Once the pilot has succeeded, integration into the customer's environment is where most of the calendar time goes. The identity provider integration takes weeks. The single sign-on configuration takes weeks. The audit log integration with the customer's SIEM takes weeks. The change management approval for production deployment takes weeks. Each of these is straightforward. Cumulatively they consume a quarter.
Vendors who have not built smooth paths through these integrations end up with deals that close on time and ship six months late. The customer is patient through the first slip. They are not patient through the second.
The contract sets the operating model
The terms in the contract are not boilerplate. The SLAs you sign in the contract become the operating cadence of your team for the duration of the relationship. The data residency commitments shape your infrastructure decisions for the following year. The audit rights you grant determine how much of your customer success time goes to producing artefacts on demand.
A founder who lets the legal team negotiate these terms in isolation is making engineering decisions through the legal team. The terms have to be reviewed by somebody who understands what they will cost to operate. That person is usually the CTO or the head of customer success, and that review is worth the time it takes.
What carries you through
The last thing I will say is that the Fortune 100 sale is a relationship sale, not a transactional sale. The customer is betting that you will still be around in three years. They are betting that you will respond when their team has an incident at midnight. They are betting that you will not disappear into a strategic pivot that orphans their use case.
Vendors who treat the relationship as the product, with the software as a feature of that relationship, win the renewals. Vendors who treat the software as the product end up with a single contract and a customer who quietly migrates to the next entrant. The math on customer acquisition cost in this segment only works if you renew. The renewal is built into the first conversation.