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Fractional CTO · hiring brief

When to Hire a Fractional CTO

When to Hire a Fractional CTO: hire a fractional CTO when the business needs senior technology decisions every week but not five days of them, and nobody in the team can own those decisions.

Brief us on this role →See CTO roles

Reviewed by Fractional Quest · updated 28 October 2026 · 5 sources linked below

  • 3–5on every shortlist
  • 5stages of vetting
  • IR35set out on every brief
When to Hire a Fractional CTO: a technology leader taking a founder through a product roadmap (illustration)

On the board · last 90 days

Which CTO roles are on the board?

Fractional CTO roles first, then the seat in any engagement and the wider function when the board runs short.

Roles

See every role on the board →

Every fractional role in the UK is on the fractional jobs board.

In the press

The brief

When to Hire a Fractional CTO: what must the role own?

Technical decisions wait for a founder who is not technical.

  • 01SignalTechnical decisions wait for a founder who is not technical.
  • 02RiskSecurity, resilience or diligence questions have no owner.
  • 03TeamEngineers need direction, not more engineers.
  • 04BudgetA permanent CTO is not yet justified.

Role reference: SFIA leadership responsibilities. SFIA describes the leadership responsibility that a fractional CTO brings and a team without one lacks.

Timing

How quickly can you hire a fractional CTO?

Fractional CTOs move between engagements, so availability is often weeks, not months.

We do not promise a shortlist by a date. The pace is set by how quickly the brief is written and how soon you can interview.

The working pattern

What changes when the CTO is fractional?

A fractional CTO owns technology direction on agreed days. It fits before a permanent CTO is affordable or needed.

The illustrative brief: a non-technical founder before a raise. Investors are asking technical diligence questions the team cannot answer.

The appointment owns: A fractional CTO owns the architecture review and diligence pack, one day a week.

Another owner retains: The founder keeps product direction; engineers keep delivery.

The case is illustrative; it does not describe a Fractional Quest placement.

From brief to start

How do you hire a fractional CTO, step by step?

The first three steps are ours; the last four are what has to be true before the first day. We don’t promise a shortlist by a date.

  1. Day 0
    01
    The 15-minute call
    What the CTO must own, the working pattern, the start date and the budget.
    You and us
  2. Week 1
    02
    Scope agreed in writing
    The outcome the seat exists for, the days, and how the engagement will run for IR35.
    Us
  3. Weeks 1–3
    03
    Search, references, shortlist
    We approach people who aren’t looking, verify tenure, take references ourselves and return three to five.
    Us
  4. Week 4
    04
    Mandate
    Write the decisions and days.
    You
  5. Before day one · 2
    05
    Access
    Provide code and systems.
    You
  6. Before day one · 3
    06
    Cover
    Name the incident lead.
    You
  7. Before day one · 4
    07
    Review
    Review after a month.
    You

Your figures

What does part of a CTO’s week cost?

Rate × days × weeks, against a loaded full-time package. Move the sliders; the numbers redraw.

  • CTO band £1,000–£1,600 (Leadership Services 2026)
Year-one cost, fractional
£119,600
2 days a week · 46 weeks · day fees, before tax · our arithmetic
Fractional executive£119,600
Full-time CTO, loaded£183,825£836 a day over 220 days · our arithmetic
Fractional costs less in year one by£64,225

Our arithmetic. £160,500 Robert Half 2026 median salary + employer NI at 15% above £5,000 (HMRC) = £183,825. Excludes pension, bonus and any search fee.

Assessment

How should you assess CTO candidates?

Put the same work and evidence in front of each candidate before comparing answers.

  1. Comparable decision
    Ask for diligence they prepared.
  2. Authority
    Test a decision on the founder line.
  3. Team
    Ask how they led a small team.
  4. Handover
    Ask how they would hand over to a permanent CTO.

Acas recommends a consistent, fair selection process: choosing who to interview.

Vetting

What happens before anyone reaches your shortlist?

Five stages before a candidate reaches a shortlist of three to five.

  1. Pedigree screen
    Tenure
    We verify prior tenure in the seat, at the scale and stage you need. No consultant presenting as an executive.
  2. Mandate fit
    Fit
    Fit to your stage, sector and the problem the seat exists to solve, not a CV keyword.
  3. Reference deep-dive
    Verify
    We take references ourselves, from recent clients and boards: what they delivered, not what they titled it.
  4. Shortlist
    Shortlist
    Three to five candidates, each with day rate, availability and IR35 position set out.
  5. Kick-off
    Start
    Scope, first-month outcomes and the contract agreed before day one.

The full process is on how we vet.

The right pattern

Does this hiring pattern fit the work?

Test the amount of the week, the expected end and the continuity needed before writing the contract.

Questions

When to Hire a Fractional CTO: questions, answered

A brief to hire a fractional CTO begins with signal: Technical decisions wait for a founder who is not technical. Then a stated working pattern and the evidence you will ask every candidate to show.

Read next

Related hiring and role pages

Sources

Where does every reference on this page come from?

  • sfia-online.org
  • HMRC
  • legislation.gov.uk
  1. 1
    SFIA leadership responsibilities sfia-online.org
  2. 2
    Rates and thresholds for employers 2026 to 2027 HMRC
    Employer National Insurance at 15% above £5,000 a year.
  3. 3
    Understanding off-payroll working (IR35) HMRC
    Status depends on how the engagement runs; medium and large clients make the determination.
  4. 4
    Check employment status for tax (CEST) HMRC
    HMRC’s own status check for each engagement.
  5. 5
    Employment Agencies Act 1973 legislation.gov.uk
    The law a recruitment agency works under; no fee to a work-seeker.

For hiring managers

Bring the brief. We bring the shortlist.

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  1. A shortlist of 3–5, each with day rate, availability and IR35 position
  2. Fractional, interim, part-time, temporary or permanent — and non-executive directors
  3. Every candidate through our five-stage vetting
  4. Your briefs and their candidates, in one room