When founders need technical firepower, they usually weigh three options. They look similar on the surface and behave very differently in practice. The right choice depends less on budget than on what you actually need owned.
The three models in one line each
- Agency: builds what you specify, on a project basis
- Full-time CTO: owns technology, full salary and equity
- Fractional CTO: senior leadership part-time, accountable for outcomes
Cost and commitment
An agency is flexible but priced per project and stops when the contract does. A full-time CTO is the biggest commitment: a six-figure salary, equity, and a hire that is slow to reverse. A fractional CTO sits between them, giving you senior judgment on a monthly retainer without the full-time cost.
Who owns the outcome
This is the real difference. An agency owns delivery of a spec; deciding what is worth building is still on you. A CTO, full-time or fractional, owns the technical direction and the result. If your problem is "we know exactly what to build," an agency may be enough. If it is "we are not sure what to build or who to hire," you need a CTO.
How to choose
- Clear spec, fixed scope, no strategy gap: agency
- Mature product, large team, technology is the core business: full-time CTO
- Need senior direction now but not the full-time cost: fractional CTO
For most early and growth-stage teams, a fractional CTO is the bridge: it gives you the leadership a full-time hire would, at a fraction of the cost, and often helps recruit that permanent CTO when the time comes.