Hiring for Startups: First C-Suite Hires — A UK Founder’s Guide

First senior hires at UK startups are among the most consequential decisions founders make, and among the most often mishandled. The pattern that recurs is founders who delay senior hiring for too long (“we can’t afford it yet”) and then over-correct by appointing full-time C-suite executives on packages the business cannot sustain — often just before a fundraise that the appointment was meant to support but ends up complicating. For most early-stage UK companies the better route is fractional-first: bring in senior leadership on part-time arrangements that deliver the strategic capability the business needs without the fixed cost of a full-time seat, then move deliberately to permanent appointments as scale and capital structure catch up.

This guide is written for founders, founding teams, lead investors and board members at UK startups from pre-seed through to Series B who are working through their first senior leadership appointments. It covers the fractional-first approach, when each senior role usually becomes necessary, where the right candidates come from, how equity works for early senior hires under the current EMI rules, the mistakes that come up again and again, and how Exec Capital supports founders through the sequence. When the business moves into its growth phase, our scale-up executive recruitment practice picks up where this guide leaves off.

The fractional-first orientation

For most UK startups, the honest answer to “do we need a CFO yet?” or “should we hire a CMO now?” is “yes, but fractionally.” A fractional executive works a set portion of the week — commonly one to three days — usually through their own limited company on a monthly retainer or day rate. The business gets senior judgement, board-quality reporting and a credible name in front of investors without committing to a full-time salary, benefits and long notice periods before the business can carry them. Our fractional C-suite service is built around exactly this kind of engagement. Three reasons fractional-first tends to work better than the alternatives at this stage.

Cost matched to scale

A full-time executive carries costs beyond base salary: bonus, pension, benefits, equity, and employer National Insurance. Since 6 April 2025, employers pay secondary Class 1 contributions at 15% on earnings above a secondary threshold of £5,000 a year, according to HMRC’s policy paper on the change. On a senior salary that adds up quickly. A fractional arrangement turns most of that into a variable cost you can scale up or down with the business, and it protects runway at the point where runway matters most.

Senior capability available now

The strongest fractional executives have usually held the full-time version of the role before, often in businesses larger than yours. Many have raised institutional rounds, run a sale process or sat on boards with private equity or venture investors. A startup that could not attract that profile on full-time terms can often secure it for two days a week, because the executive is building a portfolio rather than looking for a single employer. For a first-time founder, that experience is frequently worth more than the hours themselves: it brings pattern recognition about what investors will ask, what breaks as headcount grows and what the next hire should be.

Natural progression to permanent

Many good fractional engagements become permanent as the business grows. The fractional period works as an extended, real-world trial: both sides find out how they work together on live problems before either commits to a full-time contract. Where the fractional executive does not want to go full-time, they are usually well placed to write the brief for, and help select, their permanent successor.

The approach has limits. The CEO role almost always needs to be full-time once the business has real scale, and a founder CEO cannot be replaced by a part-time one without changing the nature of the company. Some regulated roles sit uneasily with a part-time model, depending on the firm and the function. And some situations call for a permanent appointment from the start — for example, a deep-tech business whose product depends on a technical leader who must own the architecture full-time. But for the majority of early-stage UK companies, fractional-first is the right sequence. As engineering teams grow, many companies add a VP Engineering alongside the CTO.

When does each senior role typically warrant appointment?

There is no fixed headcount or revenue line at which a role becomes mandatory. The better test is whether a specific problem is holding the business back and whether the founders can solve it themselves without taking their attention away from product, customers and fundraising. Five roles come up most often in a startup’s first wave of senior hiring.

CFO (usually fractional first, around seed to Series A)

Finance is usually the first senior capability a startup needs, often in fractional form well before Series A. A good startup CFO builds the financial model investors will test, runs cash forecasting, sets up board reporting, sorts out the share capital and option scheme paperwork, and keeps the business investable through due diligence. The trigger is often the first institutional round: if the founders are building the model and data room themselves at midnight, it is time. Our fractional CFO searches focus on candidates who have raised capital at a similar stage, not just people who have run large finance teams.

COO (often fractional first, around Series A to Series B)

The COO becomes relevant when the business moves past founder-led operations and needs structured operating rhythms: planning cycles, performance measures, process, supplier management and the people infrastructure that keeps a growing team pointing the same way. A fractional COO is particularly effective during the stretch where the founder clearly needs operating support but the business does not yet justify a full-time seat. The role is easy to over-hire for; be specific about which operational problems you are actually asking the person to fix.

CMO or Marketing Director (usually fractional first, around Series A)

Demand generation and positioning tend to matter earlier than founders expect, especially in businesses that have found initial traction through the founders’ own networks and now need a repeatable pipeline. A fractional CMO can set the strategy, choose channels, build the measurement framework and hire the first marketers without the cost of a full-time executive. Where revenue leadership is the bigger gap, a sales or revenue leader may come before a marketer — the order should follow the bottleneck.

CTO or Technical Director (varies — often permanent, sometimes a fractional bridge)

For technology and SaaS startups, the CTO is often a co-founder or near-founding appointment and is rarely fractional for long. For non-tech startups adding technology capability, or tech businesses whose founding engineer is not ready to lead a larger team, a fractional CTO can review the architecture, set engineering standards, prepare for technical due diligence and help recruit the permanent leader.

CHRO or HR Director (usually later, around Series B)

Senior people leadership usually becomes necessary once the team has grown beyond the point where founders know everyone personally and informal practices start to cause friction — inconsistent pay decisions, unclear progression, rising attrition or employment risk. Earlier-stage businesses typically manage with founder-led HR plus outsourced support, sometimes adding a fractional people leader to design the frameworks before the full-time hire.

The candidate pool

The UK pool of fractional and early-stage senior executives is deep, but it is not uniform. Five groups come up repeatedly in startup searches, and each needs to be assessed differently.

• Established fractional executives working across several businesses. The most direct pool: senior people who have built a portfolio of two or three engagements and bring prior C-suite experience. The question to test is capacity — whether they genuinely have the time you need at the moments you need it, such as during a fundraise.
• Recently exited executives moving to portfolio careers. People who have been through a sale or IPO and are rebuilding their working life around part-time roles. They bring a strong track record, but check whether they want the hands-on work an early-stage business demands or are looking for something closer to an advisory seat.
• Senior executives between full-time roles. Candidates using fractional work while they look for the next permanent position. They can be excellent, but be clear about commitment: if a full-time offer arrives mid-raise, what happens?
• Professional services partners moving in-house. Partners and directors from accountancy, advisory and consulting firms. Common for finance and people roles; strong on technical rigour, and the thing to test is comfort with ambiguity and doing the work themselves rather than directing a team.
• Step-up candidates from larger companies. Leaders one level below the top in bigger businesses who want their first C-suite title. They often bring energy and current methods, and can be a strong permanent hire; assess whether they can operate without the support functions they are used to.

Across all five groups, stage experience matters more than brand names. A CFO who has taken a business from seed to Series B will usually be more useful to you than one who has only run finance at a large, established company, however impressive the CV.

Equity for first senior hires

Equity is often the deciding economic factor for first senior hires, because startups usually cannot match the cash packages of established employers. Getting the structure right early avoids tax problems and awkward conversations later. Three approaches recur.

EMI options

Enterprise Management Incentives remain the standard tax-advantaged option scheme for qualifying UK companies, and the limits widened significantly this year. For options granted on or after 6 April 2026, a qualifying company can have gross assets of up to £120 million (previously £30 million) and up to 500 employees (previously 250), and the company-wide limit on the value of unexercised EMI options rises from £3 million to £6 million. The maximum exercise period has also been extended from 10 to 15 years. These changes are set out in the government’s policy paper on the EMI limits. In practice it means more growing companies can keep using EMI for longer as they scale, rather than switching to less favourable arrangements after a large round.

EMI options can also help at exit. Under the Business Asset Disposal Relief rules on GOV.UK, shares acquired through EMI can qualify without the usual 5% shareholding test, provided the option was granted at least two years before the sale and the other conditions are met. From 6 April 2026 the relief gives a Capital Gains Tax rate of 18% on qualifying gains. The important caveat for this guide: EMI is for employees who meet the scheme’s working-time requirement. A fractional executive engaged through their own company will not normally qualify, so their equity, if any, needs a different structure.

Growth shares and unapproved options

Where a business does not qualify for EMI, or where the individual is not an eligible employee, growth shares or unapproved options are the usual alternatives. Growth shares give the holder value above a hurdle set at or above the current valuation, so existing shareholders keep the value already built. They need a proper valuation and specialist tax advice, and the paperwork should be finished before the executive starts rather than promised for later.

Vesting structures

Permanent senior hires usually receive equity that vests over several years, often with an initial cliff, plus clear good-leaver and bad-leaver terms. Fractional engagements vary: some include a modest equity element tied to milestones such as closing a round, while others are fee-only so the business preserves its option pool for the permanent team. Whatever you choose, decide it before the offer stage and make sure your lead investor is comfortable with it. Our executive equity and incentives guide covers the options in more depth.

Common startup senior hiring pitfalls

Six patterns come up again and again.

• Hiring full-time when fractional fits better. The most common mistake at this stage. A full-time executive with half a job to do will either create work to fill the time or leave.
• Setting equity terms without proper thought. Promises made in a first conversation become expectations. Without a valuation, a scheme and investor sign-off, they turn into tax problems and friction at offer stage.
• Founder dynamics that leave no room for the hire. A senior hire needs real authority and decision rights. Founding teams that cannot let go of the area they have hired for produce predictable mismatches and early exits.
• Hiring just before a fundraise without thinking about sequence. Executives brought in purely to help close a round sometimes leave once it closes. Decide whether you need someone for the raise or for the two years after it, because they may not be the same person.
• Leaving the board and investors out. Lead investors usually have strong views on senior hiring and often useful networks. Founders who involve them late lose that input and risk a veto at the end of the process.
• Benchmarking pay against large-company packages. A startup offer should be built around stage-appropriate cash, meaningful equity and the role itself, not a copy of what a listed company would pay.

Getting the engagement terms right

A fractional arrangement is only as good as its terms. Agree the expected days per month and how flexible they are around board meetings, fundraising and year-end; what the executive is accountable for and what they are not; how they will be measured; notice on both sides; confidentiality and intellectual property; and whether they will hold a board seat or attend as an executive. Put this in writing before the start date.

Status under the off-payroll working rules (IR35) also needs attention. Who decides whether the rules apply depends on the size of the client business: medium and large clients must make the status determination themselves, while for small clients the responsibility sits with the worker’s own company. HMRC’s guidance on off-payroll working for clients explains how to work out which applies. A startup that grows quickly can cross the size thresholds mid-engagement, so revisit the position after each funding round or year-end, and take advice where the answer is not clear.

Moving from fractional to permanent

The switch to a full-time leader is usually prompted by one of a few signals: the fractional executive is consistently working more days than agreed; the function now has a team that needs daily leadership; investors are asking for a full-time owner of the area; or the business is preparing for a larger raise, sale or listing where a permanent leader is expected. Plan the transition rather than reacting to it. Decide early whether the fractional executive is a candidate for the permanent role, and if not, ask them to help shape the brief and assess the shortlist. Give the permanent hire a proper handover period with overlap, so knowledge of investors, systems and decisions does not walk out of the door. At this point the business is moving out of startup mode, and our scale-up executive hiring guide covers the next stage of team building.

How Exec Capital approaches startup senior hiring

Exec Capital works with founders on the senior hiring sequence as a whole: which senior capability the business needs now, in what model, and what the realistic progression looks like over the next twelve to twenty-four months. We run both fractional and permanent searches for UK startups, and we will tell you when a fractional engagement makes more sense than the full-time hire you came to us for — or the other way round.

Each search starts with a working brief built with the founders and, where relevant, the lead investor: the problems the hire must solve, the stage experience that matters, the time commitment, the cash and equity envelope and the decision process. Our specialist team then searches across the candidate pools described above, assesses candidates against that brief and presents a shortlist with an honest view of each person’s strengths and risks. Adrian Lawrence FCA oversees each mandate. As the business grows, the same relationship carries into our executive recruitment for scale-ups, so the next layer of leadership is hired with the same understanding of the business.

For founders working through first senior hires, planning the senior team alongside an upcoming fundraise, or reviewing fractional arrangements that have grown beyond their original scope, we offer a structured first conversation with no obligation.

Frequently asked questions

What should a startup’s first senior hire be?

For most UK startups it is finance, usually a fractional CFO around the first institutional round. But the right answer depends on the bottleneck: if sales or product is what is holding the business back, that role should come first.

How many days a week does a fractional executive work?

It varies with the role and stage. One to three days a week is common, often with flexibility to increase during a fundraise, audit or major project. Agree the pattern and the flex in writing at the start.

Can a fractional executive receive EMI options?

Not usually. EMI is for employees who meet the scheme’s working-time requirement, so a fractional executive engaged through their own company will not normally qualify. Unapproved options, growth shares or milestone fees are the usual alternatives; take specialist tax advice.

Should investors be involved in senior hiring?

Yes, early. Lead investors often have rights over senior appointments and equity grants, and they bring useful networks and judgement. Agree their role in the process before candidates are approached.

When should a fractional role become permanent?

When the role consistently needs more time than agreed, the function has a team needing daily leadership, or investors expect a full-time owner. Plan the transition with an overlap rather than ending the fractional arrangement abruptly.

Further reading

The related services panel below links to our fractional, technology, finance and board services, together with guides on choosing between fractional, interim and permanent models and on building an executive team before Series A. For the next stage of growth, read the scale-up guide linked above, and for option schemes and growth shares, the equity and incentives guide. For senior finance appointments at growing UK businesses, our sister firm FD Capital specialises in fractional and permanent CFO and Finance Director roles.