Build vs buy: AI agents

SaaS wins the sprint: if your workflow matches the product, you can be running in days. An integrator build takes weeks (our pilots run 30 days against your real data). Hiring takes the longest by far: months of recruiting plus months of ramp before the first workflow ships.

The trap is optimizing for week one. The workflow you automate will run for years; a few weeks of fitting matters less than the fit itself.

Vertical SaaS is built for the median customer. If you are the median (standard bookkeeping, standard meeting notes), that is exactly what you want. The further your process is from standard (approval chains, multiple systems, industry quirks), the more your team bends to fit the tool.

Custom builds invert this: the agent learns your workflow as it actually runs, including the parts you'd never find in a product's settings page. That is also why no product exists for workflows that span QuickBooks, Zendesk, and your ERP at once: nobody can productize your specific combination.

Each SaaS vendor covers one function, so breadth means a subscription stack: one tool for support, one for bookkeeping, one for meeting notes, each with its own data silo and login. An in-house engineer or an integrator covers whatever is next on the list, and each build reuses the plumbing of the last.

With SaaS, your documents and customer data live in the vendor's cloud under the vendor's terms; review each one's data handling separately. With in-house or integrator builds done right, data is processed through your own accounts with the model providers under no-training API terms, and nothing is warehoused by a third party. We put that in the contract.

Subscriptions buy access, not assets. If the vendor raises prices, gets acquired, or pivots, your workflow moves with them, and the switching cost is yours. This is not hypothetical in a market moving this fast.

An owned system carries none of that: the code sits in your accounts, and any competent engineer can maintain it. The integrator's leverage over you is only as good as their service, which is exactly the incentive you want them to have.

SaaS is self-serve: when it misbehaves, you file a ticket. An in-house engineer is a team member you manage, retain, and eventually replace. An integrator under a retainer is accountable by contract: monitoring, response times, and a monthly improvement, without a seat on your payroll. Pick the load you actually want to carry.

The models under all of this improve and get deprecated on a cycle of months, not years. A SaaS vendor absorbs that churn for you, and also changes your workflow's behavior silently when they swap models. An in-house engineer spends real time re-evaluating. Under our retainer, model updates are applied and regression-tested against your workflows, so improvements arrive without surprises.

Whichever path you pick, insist on this property: the system's rules and tests should outlive any particular model. Swapping the engine should never mean rebuilding the car.

AI rules increasingly assign duties by role: who provides the system, who operates it. With SaaS, you accept the vendor's terms and their compliance posture wholesale. With a custom build, roles can be set deliberately: in our contracts you are the owner and operator, we are the integrator, and for EU-facing work we scope engagements to stay out of high-risk categories by design.

For most SMB back-office workflows this is straightforward. The point is that it's written down before anything runs, not discovered afterward.

Whatever path you choose, apply one test: if the people who built it vanished tomorrow, could a stranger operate the system? For SaaS the answer is no by definition; you'd be shopping again. For in-house, it depends entirely on documentation culture. For an integrator, demand it contractually: documentation, a recorded walkthrough, credentials inventory, and code in your accounts.

We structure every build to pass that test, because it is also what makes our own maintenance honest: a client who can leave is a client you have to keep earning.