Guide
How to hire a fractional CTO
To hire a fractional CTO, first write down the decision that is stalling and who owns it today. Size the commitment in days a month, not hours. Then test candidates on accountability rather than advice, take two references from finished engagements, and agree in writing what they decide, what they only recommend, and how the arrangement ends.
Hiring a fractional CTO is a different purchase from hiring a permanent one: you are buying decisions and accountability for a few days a month, not headcount. Six steps, where to find candidates, the questions that separate accountability from advice, what it costs and how long it takes. Written from the other side of the table, having taken these engagements for over a decade.
Before you start
When hiring a fractional CTO is the right call
The arrangement fits when the business needs senior technical judgement and accountability regularly, but not every day. These are the situations that bring founders to me. If none of them describes you, the honest answer is usually to wait.
- Delivery dates move without an explanation the board can check.
- An agency or offshore partner is being paid on trust, with nobody senior reading what shipped against what was promised.
- An investor, insurer or enterprise customer has asked technical questions nobody in the business can answer.
- Technology spend is rising and nobody can say which part of it is buying anything.
- A capable engineering lead is being asked to make executive calls the role was never sized for.
If there is no technical leadership at all and a team to run day to day, that is an interim appointment rather than a fractional one: interim CTO versus fractional CTO sets out the difference, and when to hire your first CTO covers the earlier decision.
The six steps
- 01
Write down the gap before you write a brief
A brief that describes a person is harder to buy against than one that describes a decision. Keep it to one page.
- The decision or piece of delivery that is currently stuck.
- Who owns it today, and what that person is missing.
- What happens if it is still stuck in three months.
- What you want to be true at the end, so both sides can tell whether it worked.
- 02
Size the commitment in days a month
In my own engagements the advisory end runs at one to four days a month, and one to two days a week where there is a team to run. Buy the smaller number first and raise it when the work proves it is needed. Sizing up is easy; unwinding an oversized retainer is not.
- 03
Test for accountability, not for opinions
Anyone senior can produce a plausible view of your architecture in an hour. What you are buying is whether they will own the outcome. Ask the questions that only somebody who has carried the role can answer.
- What will you personally decide, and what will you only recommend?
- Tell me about a delivery commitment you made to a board that you missed. What did you say, and when?
- How will I check, three months in, whether this is working?
- What would make you tell me I do not need this arrangement?
- Who covers the standing decisions in the weeks you are not here?
- 04
Take references from finished engagements
Ask for two references where the arrangement has ended, not two where it is still running and still being invoiced. A finished engagement tells you what was left behind: written decisions, stronger technical leads, a plan the board could verify. An ongoing one only tells you the relationship is comfortable.
- 05
Put the mandate in the engagement letter
The commercial terms are the easy part. The part that decides whether this works is written authority. An engagement letter that leaves it vague produces someone who advises and cannot be held to anything.
- Days a month, the standing slot, and availability between visits.
- Decision rights: what they sign off, what goes to the founder, what goes to the board.
- Board reporting: whether they attend, and in what capacity, since a fractional CTO sits inside the executive line and is not a director.
- Intellectual property, confidentiality and, where the work touches personal data, the data protection terms.
- Notice on both sides, and what documentation is handed over on exit.
- 06
Agree the exit at the start
A fractional arrangement done properly makes itself unnecessary. Agree at the outset what has to be true for the days to reduce: an internal lead who can hold a supplier to account, a plan the board can verify without translation, a permanent CTO recruited and handed over to. If nobody can describe the end state, the arrangement is a subscription rather than a piece of work.
Sourcing
Where to find candidates
Four routes, in the order I see them work. Whichever you use, compare mandates rather than profiles: what the person will decide, what they will only recommend, and what the board will be told.
Founders and investors who have used one
The strongest route in my experience. A referral comes with a finished engagement behind it, so you can ask what was left behind rather than how the relationship feels.
Fractional marketplaces and talent platforms
Fast to shortlist and useful for comparing profiles. Read the mandate rather than the title: platform listings tend to describe availability and rate, not what the person is authorised to decide.
Executive search and interim providers
Worth it when the gap is closer to a full-time interim appointment than a few days a month. Expect a fee structure that reflects a search rather than an introduction.
Approaching someone directly
Slower to assemble a shortlist, quicker to get to substance, and there is no intermediary between you and the person who will do the work.
Time and cost
How long hiring takes, and what it costs
A fractional hire usually runs two to four weeks end to end, against months for a permanent CTO search. This is the shape of it in my experience.
| Stage | Typical duration | What it involves |
|---|---|---|
| Write the brief | 1 to 3 days | One page: the decision that is stalling, who owns it today, and what happens if it stays stuck. |
| Shortlist | 1 to 2 weeks | Three candidates is enough. More than that and you are comparing personalities rather than mandates. |
| Interview and references | 1 to 2 weeks | Two conversations each, plus two references from engagements that have ended. |
| Engagement letter and start | Days | Days a month, decision rights, board reporting, notice and handover on exit. |
On cost, UK providers were advertising £600 to £2,500 a day when I checked published rates on 25 August 2026, with most of the market between £1,000 and £1,600. At one to four days a month that is a monthly commitment rather than a salary and its employment costs. What a fractional CTO costs lists the benchmarks and their sources for the UK, the US and Singapore.
What goes wrong
Four mistakes worth avoiding
Hiring a fractional CTO for a full-time gap
If a technical team has nobody running it day to day, two days a month will not close that. That is an interim appointment, at full-time intensity, for a fixed term.
Comparing day rates without comparing mandates
One quote may be written advice; the other may be standing accountability for suppliers, security and what the board is told. The rates look comparable, the purchases are not.
Appointing them to the board at the same time
A board seat carries statutory duties under the Companies Act 2006 and exists to scrutinise the executive. Someone running technology inside the business cannot independently scrutinise their own work.
Buying reassurance rather than judgement
If the technical decisions still sit comfortably with a founder who understands them, and nobody external is being paid on trust, you may not need this yet. A candidate worth hiring will say so.
Questions
Common questions
- How much does a fractional CTO cost?
- UK providers were advertising £600 to £2,500 a day when I last checked published rates on 25 August 2026, with most of the market between £1,000 and £1,600. The spread is driven by seniority, sector and whether the role carries accountability or only advice. The cost guide on this site sets out the benchmarks and the sources for the UK, the US and Singapore.
- How many days a month should a fractional CTO work?
- In my own engagements it is one to four days a month where the work is direction, supplier oversight and board reporting, and one to two days a week where there is an in-house team to run. Start at the lower end and increase it when the work demonstrates the need.
- How long does it take to hire one?
- Days to weeks in my experience, which is much of why companies use the arrangement. A permanent CTO search runs to months, and businesses rarely have that long once delivery is already slipping.
- Should a fractional CTO take equity?
- It comes up regularly at the early stage, and it changes the incentive. Equity buys commitment to the upside; a fee buys someone who can tell you a plan is wrong. If you want candid challenge, keep the fee arrangement clean and treat any equity as a separate, later conversation.
- What is the difference between a fractional CTO and a part-time CTO?
- Nothing meaningful. Fractional CTO, part-time CTO and virtual CTO describe the same arrangement, and none of the three titles is defined in law. What matters is the mandate in the engagement letter, not the label on it.
- Where do I find a fractional CTO?
- Four routes in practice: a referral from a founder or investor who has used one, a fractional marketplace, an executive search or interim provider, or approaching someone directly. Referrals and direct approaches get you to substance fastest because there is no intermediary between you and the person doing the work.
- What contract do you use to hire a fractional CTO?
- A consultancy or services agreement with an engagement letter, not an employment contract. The arrangement is normally invoiced through the individual's own company. UK clients should check HMRC's off-payroll working rules, which set out when the client rather than the contractor is responsible for determining employment status for tax.
- Can a fractional CTO also be our non-executive director?
- Not at the same time, and not well. A non-executive director sits outside the executive holding it to account and carries directors' duties under the Companies Act 2006. A fractional CTO sits inside the executive line. Combining them removes the scrutiny the board seat exists to provide.
Sources and review
The process and the questions on this page are stated as experience, drawn from twenty years running technology functions as a CTO, a COO and a consultancy founder, not as an industry standard. The day rate range quoted is taken from rates UK providers publish, checked on 25 August 2026 and listed with their sources on What a fractional CTO costs . The point about directors’ duties comes from the Companies Act 2006, sections 170 to 177.
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Enquiry
Describe the gap and I will tell you what it needs
Say what has stalled and who owns it today. A first conversation is free and there is no pitch at the end of it. If a fractional CTO is not the right answer I will say so.
Send me a note
Working out whether you need one yet?
Describe what has stalled and who is accountable for it today. I will tell you plainly whether this is a fractional arrangement, a different role, or nothing yet.