The Financial Controllers who genuinely scale a team through growth are the ones who build process before they need it, hire ahead of the curve, and turn a reactive month end into a predictable one. They do not just close the books faster. They change what your function is capable of, which is the whole point of hiring one.
If you are a CFO or Finance Director hiring the layer below you, the difference between a good Controller and a scaling Controller is worth a great deal of your week. This is what that difference looks like in practice.
What does it actually mean to scale a team through growth?
Scaling is not the same as coping. Plenty of Controllers survive rapid growth by working longer hours and holding more in their heads. That is not what you want.
A Controller who scales does the opposite. As volume rises, their personal involvement in the routine falls, because they have built the structure that absorbs it.
You can usually spot this in the numbers. Headcount in the transactional team grows slower than revenue. Close time holds steady or shortens as the business gets more complex. Errors do not spike after every new entity or acquisition.
That is the signal. The function got bigger and the Controller got more strategic at the same time.
How do you spot one in an interview?
Ask about the boring middle, not the highlights.
Weak answers focus on outcomes. "We cut close from fifteen days to eight." Good, but ask how. The scaling Controller will describe the mechanism without prompting. A close calendar with named owners. A hard cut off for accruals. A review that catches issues on day two, not day seven.
Ask who they promoted. A Controller who has scaled a team has usually developed at least one person into a role that person could not have done before. If every hire came in fully formed, they may be a good manager of talent but they have not proven they can build it.
Ask what they stopped doing. The honest ones can name a task they used to own and consciously handed down. That single answer tells you they understand their job is to work through the team, not around it.
What has a scaling Controller usually built?
Look for evidence of these, because they are the load bearing walls of a finance function that grows.
A documented close process that a new joiner could follow. Not a mental model, an actual playbook.
A clear split between transactional work and value work, so purchase ledger and reconciliations do not eat the days that should go to analysis.
Reporting that arrives on the same date every month, with commentary, without a fire drill.
Controls that scale with the business. New supplier onboarding, approval limits, segregation of duties that hold up as headcount doubles.
A team structure with room in it. They will have a view on the next hire before you ask, and a reason for the sequence.
Why does this matter more than technical brilliance?
Technical accuracy is the baseline. You should assume any serious candidate can produce a clean set of accounts.
What you are really buying is time. Your time. A Controller who scales frees up your week by making the function run without you in the middle of it. That is what lets you spend your attention on the things only you can do.
The cost of getting this wrong is quiet but real. A Controller who cannot scale becomes a bottleneck exactly when the business is moving fastest. Everything routes through them, and your week fills with escalations that a stronger structure would have prevented.
Where do these people come from?
In our experience at Harper May, the strongest scaling Controllers in London tend to have one thing in common. They have lived through a genuine step change, not just a busy period.
That might be a funding round that tripled headcount. An acquisition that added entities and currencies overnight. A move from founder led finance to a proper function. The scar tissue matters. It is hard to fake having built a team while the ground was moving.
When you are hiring, weight that experience over the brand on the CV. A Controller who scaled a scrappy business through real growth often outperforms one who ran a mature, stable function at a larger name.
If you are building out that layer now, it is worth looking at the live finance roles and the shape of the market before you commit to a brief.
Common questions
Should I hire a Controller who has scaled a bigger team than mine?
Usually yes, within reason. Someone who has run a larger function will find yours manageable and will build with the next stage in mind. Just check they still want to be hands on, because some drift away from the detail as teams grow.
How do I know if my current Controller can scale, or if I need someone new?
Give them a real scaling problem and watch how they respond. Do they ask for more people, or do they propose a process change first? The instinct tells you a lot. Development is often faster and cheaper than replacement, if the instinct is right.
