Fractional CTO vs agency vs full-time hire — which fits your stage?
Three ways to get senior technical leadership. Different costs, different decision latency, different shapes of failure when the fit is wrong. Written by someone who is one.
The one-line verdict
Fractional CTO
Who it fits
Pre-seed to Series A startups without a technical founder; post-seed teams whose first senior engineer is drowning.
Typical cost
€5k–15k / month, 10–20 hrs/wk
Engineering agency
Who it fits
Companies with a product-market fit and stable specs that need to ship many features fast, willing to trade context-building for velocity.
Typical cost
€80–200 / hr, retainer or SOW
Full-time CTO
Who it fits
Post-Series-A companies with >10 engineers, an IP-heavy core, and a board that expects a named technical executive.
Typical cost
€180k–300k + equity
Head to head
The axes that actually decide it.
Time to useful
Fractional CTO
Day 2. Audits stack, reviews hires, sits in sprint planning within the first week.
Agency
Week 2–4. Discovery → SOW → kickoff before real code moves.
Full-time hire
Month 3. Real ramp into a new company takes a quarter even for an A+ hire.
The takeaway
Fractional wins the first-90-days race. Full-time wins the 18-month race.
Monthly cost
Fractional CTO
€5k–15k, no equity (unless negotiated).
Agency
€10k–60k on a retainer, often zero permanent accrual.
Full-time hire
€15k–25k fully-loaded + 1–3% equity.
The takeaway
Fractional and full-time land in the same cash ballpark; the difference is equity and hours.
Decision latency
Fractional CTO
Fast on technical calls. Slower on culture / hiring than an embedded exec.
Agency
Slow on strategy — agencies are paid to implement, not decide.
Full-time hire
Fastest, once ramped. Slowest during the ramp.
The takeaway
If you need strategic calls this week, agency is the wrong tool regardless of budget.
Context-building
Fractional CTO
Medium. Part-time attention is the honest tradeoff.
Agency
Low. Agencies build context on billable hours; you pay for it twice.
Full-time hire
Highest. A good CTO carries the entire system in their head.
The takeaway
If your product lives or dies on deep context, the fractional→full progression is the natural arc.
Code output
Fractional CTO
Medium — 30–50% of hours. Hands stay on when it matters.
Agency
Highest. Ten engineers on demand.
Full-time hire
Variable — some CTOs ship weekly, others stop after year one.
The takeaway
If shipping code IS the bottleneck, agency wins the hours-per-dollar math.
When it goes wrong
Fractional CTO
Under-allocated hours — you outgrow them. A good fractional will tell you.
Agency
Context gets stuck in the agency and never transfers to your team.
Full-time hire
Bad hire is a 12-month unwinding. Pre-revenue companies die of it.
The takeaway
The failure modes differ in kind. Match the failure you can afford to recover from.
Use this, not that
Reach for each when…
Fractional CTO
- You're between MVP and Series A and your founding engineer is making architecture calls they shouldn't be making alone.
- You need a technical partner for fundraising (due diligence, investor calls, architecture decks) but can't offer the equity for a full CTO yet.
- You're a non-technical founder hiring engineers and need someone who can actually tell a great hire from a charming one.
- You're shipping features in parallel to building a team, and a full-time CTO feels 6 months early.
Agency
- The spec is well-defined and you're trading context depth for bandwidth.
- You have a PM or product lead who can run the brief end-to-end.
- You need 8 engineers for 3 months, not 1 senior for 24.
- The code isn't the moat — it's the distribution or the data.
Full-time hire
- You're past Series A with >10 engineers and a real org to lead.
- Your product is IP-heavy and the technical roadmap IS the business roadmap.
- The board expects a named technical executive on the cap table.
- You've validated with a fractional or strong VPE for 9+ months and know what shape of CTO actually fits.
Free download · 6 pages · PDF
The first 90 days of a Fractional CTO.
What gets audited, decided, and shipped in the first three months of an embedded engagement. Week by week, including the uncomfortable conversations most founders avoid.
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David Dacruz
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Next step
Think fractional is the right shape?
If your stage matches the fractional profile above — pre-seed to post-Series A, shipping weekly, no senior technical partner yet — let's scope it.