ROLES

Fractional CTO

A senior technology executive working 1 to 3 days a week for your company, on a defined scope, without the equity or the full-time salary.

Last reviewed: byKevin Riedl wiki ↗

The market for fractional CTOs exists because hiring a full-time one too early is expensive and hiring one too late is fatal. A fractional CTO bridges the gap: they make the architecture calls, run the hiring loop for senior engineers, sit in on board meetings, and write the technical sections of investor decks.

Worked example: a seed-stage company has two strong mid-level engineers, a founder who can read code but not architect a system, and an investor asking why the roadmap keeps slipping. They do not need a full-time CTO at 180k plus equity. They need someone two days a week to set the architecture, unblock the two engineers, and turn the roadmap into milestones the board can track. That is the textbook fractional CTO mandate, and it usually runs six to twelve months until a full-time hire is justified.

What they do not do, usually, is write production code. If your team needs a strong individual contributor, you want a senior engineer with a CTO sounding-board, not a fractional CTO doing the engineering themselves. We sometimes blur this line at Wavect when the team is small enough that the CTO must still ship; the SoW makes the boundary explicit.

The legal nuance in Austria: a fractional CTO is normally engaged as a Dienstvertrag or a freier Dienstvertrag, not a Werkvertrag, because they owe ongoing judgement and availability, not a single fixed deliverable. That matters for liability and for how the engagement gets booked. Do not let a vendor dress a fractional CTO retainer up as a fixed-scope contract; the obligations are different.

The common founder mistake: confusing a fractional CTO with a fractional co-founder. The CTO covers technology authority. The co-founder posture adds product strategy and ownership behaviour. If you want someone to challenge your roadmap and not just your stack, you want the latter. The honest trade-off with any fractional model is continuity: a part-time executive will never have the context depth of a full-timer, so the engagement only works if the scope is bounded and the handoff is planned from day one.

Watch for vendors selling “fractional CTO” as a renamed account-manager role. A real fractional CTO has decision authority, attends the same meetings a full-time one would, and is named in your board materials.

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FAQs

Market rate is roughly 1,500 to 3,500 EUR per day in DACH, billed against a retainer or an SoW. Wavect’s Fractional Co-Founder model is flatter and simpler at 400 EUR per week. The cheapest fractional CTO is almost always too junior; the most expensive is often a rebranded account manager. Check decision authority before checking the rate card.
When you need someone to write production code full-time, when your team has zero senior engineers to back-fill execution, or when your founder is not ready to share architecture decisions. In those cases you want a senior engineer, a tech lead, or therapy, not a fractional CTO.
Three tests: they are named in your board materials, they make architecture calls without escalating to a sales rep, and they will tell you ’no’ on a feature without checking with their agency. If any of those fail, you bought account management with a CTO sticker.