What is a fractional CTO?
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Why it matters
Early startups face a gap. They need someone with real seniority to make the big technical calls, but they cannot yet justify, or fund, a full-time executive. A fractional CTO closes that gap. You get the judgement of a CTO who has shipped before, on a part-time arrangement, so the architecture, the hiring, and the build-versus-buy decisions are made by someone who has seen them go wrong. The honest version of our pitch is similar: most early companies need one genuinely senior engineer steering the work, not a team of ten.
What they actually do
It varies, but usually some mix of: setting technical direction, reviewing or designing the architecture, vetting or leading engineers, sanity-checking timelines and budgets, and being the person a non-technical founder can ask "is this normal?" without being snowed. A fractional CTO can also run a technical due diligence before you invest in or acquire another company, or define and oversee the build of an MVP so it is scoped around what actually needs proving.
Fractional CTO vs a full-time hire
A full-time CTO is right once the technical workload, and the budget, genuinely justify a senior person every day. Before that point, paying an executive salary to a role that is busy two days a week is waste. The trap runs the other way too: stretching a fractional arrangement long past the point where the company clearly needs someone in the building full-time. Used well, fractional is the bridge, senior help now, a full-time hire when the work has earned it.