The decision gap
In small SaaS teams, there's a layer of decisions that aren't code but need technical context. Third-party trade-offs. Scope calls. Tooling choices.
These don't belong to the founder alone. The technical depth required to evaluate them pulls you away from what you do best. And they don't belong to your lead dev, who needs focus time to ship.
Someone has to own that gap. Close enough to the code to understand constraints. Far enough from it to protect the team's time. That's what a fractional CTO does. Not architecture diagrams and org charts. Decisions that would otherwise pile up until something breaks.