Start from the constraint, not the gap
A gap is a seat nobody is sitting in. A constraint is the thing currently limiting the business. They are not the same, and hiring against the gap is how companies end up with a fractional CMO while the real problem was that nobody could tell which customers were profitable.
The test is simple. If this seat were filled brilliantly tomorrow, what would change within ninety days? If the honest answer is that things would be tidier, it is a gap. If the answer is that a specific decision would get made, a specific number would move, or a specific blockage would clear, it is the constraint.
The four questions that settle it
- What is the next thing that could kill the company? Cash, a failed raise, a security review that stops an enterprise deal, a churn rate nobody has diagnosed. Whatever answers that question names your seat.
- Where is the founder the bottleneck? If every decision in one function routes through you, that function is where a senior person buys you the most time back.
- What is coming in the next two quarters that you have never done before? A raise, a first enterprise customer, a market entry, an acquisition. Hire the seat that has done it before.
- Which function has numbers nobody trusts? Untrusted numbers make every other decision slower, which is why finance is so often the right first seat even when it does not feel like the most urgent one.
What each seat is usually the answer to
| If this is true | The first seat is | Typical UK day rate |
|---|---|---|
| You cannot forecast cash past a quarter, or a raise is coming | CFO | £800 to £1,500 |
| Marketing spends and nobody can attribute the return | CMO | £700 to £1,300 |
| The architecture is a decision nobody senior is making | CTO | £800 to £1,400 |
| The company has outgrown how it is run day to day | COO | £700 to £1,300 |
| Revenue depends entirely on the founder selling | Sales Director | £700 to £1,300 |
| An enterprise deal is stuck on a security questionnaire | CISO | £900 to £1,500 |
| Everyone has a number and none of them agree | Data Lead | £700 to £1,200 |
Why finance is the most common first seat
Not because finance matters more than marketing or product, but because it is the function whose output every other function depends on. A marketing decision made on unreliable unit economics is a guess wearing a spreadsheet. So is a hiring plan, a pricing change and a fundraising deck.
There is a second, less discussed reason. A fractional CFO usually pays for themselves in a way that is easy to see: a renegotiated contract, a corrected margin, a working capital cycle that frees cash. That visibility makes the second fractional hire an easier conversation internally than the first one was.
The mistake worth avoiding
Hiring two seats at once because the budget allows it. Two new senior people arriving in the same month will both spend their first six weeks learning the business, from you, at the same time. The cost is not the second day rate. It is that you become the bottleneck you were trying to remove.
Fill one seat. Give it a quarter. The second hire is easier to choose once somebody senior has told you what they found.
Questions
- Which fractional executive should a startup hire first?
- Usually a CFO, because untrusted numbers slow every other decision and because the return is visible enough to make the second fractional hire easier to justify. The exception is when something else could kill the company sooner: a stalled enterprise deal points at a CISO, and revenue that depends entirely on the founder points at a sales leader.
- Can you hire two fractional executives at the same time?
- You can, and it usually costs more than it looks. Two senior people arriving together both spend their first weeks learning the business from the founder, at the same time, which turns the founder into the bottleneck the hires were meant to remove. Fill one seat, give it a quarter, then decide.
- How do I know if I need a fractional executive or a full-time one?
- Count the days of genuinely senior work in the function each week. If it is one to three, a fractional appointment fits. If the work is five days and you are deferring it because of cost, you need a permanent hire and the honest answer is to wait until you can fund one.