Chief of Staff vs COO: 4 reasons a scale-up CEO needs a Chief of Staff first

What this guide covers: If you are stuck on Chief of Staff vs COO, this guide shows you which role solves which problem, when a founder-led scale-up usually needs leverage around the CEO rather than formal operational ownership, and how to decide without adding process, cost and hierarchy too early.

What is the difference between a Chief of Staff and a COO?

A Chief of Staff is a force multiplier for the CEO. They create clarity, prepare decisions, run follow-through, unblock teams and make sure priorities actually land. A COO is an operating executive. They own processes, systems, cross-functional operations and day-to-day management at a more structural level.

That is why this is not really a title question. It is a stage question. If you still need flexibility, fast iteration and tighter CEO leverage, a Chief of Staff is often the better fit. If you already know how the machine should run and now need someone to run it at scale, that is when a COO makes more sense.

1. A Chief of Staff lets the CEO keep control of culture and strategy

As founder and CEO, you usually still are the business. Your judgement, your pace and your standards shape the culture whether you intend them to or not. If you hire a COO too early, you risk inserting a powerful layer between you and the company before the organisation is ready for it.

A Chief of Staff is different. They work as your right hand. They turn half-formed thinking into clear priorities, keep the plan moving and make sure the things in your head become visible in the business. You get more leverage without creating another layer of drag. That is also why founder coaching at this stage often focuses more on leverage and alignment than classic operations.

This is one reason Jeff Bezos used a Chief of Staff model rather than defaulting to a classic COO fix. When your advantage is founder-led vision and pace, you should be very careful about introducing a senior operator whose instinct is to stabilise before the business has earned stability. Bain’s work on founder’s mentality makes the same point: scale usually goes wrong when leaders let bureaucracy outrun mission and speed.

2. A Chief of Staff fills the gaps around a founder better than a COO usually does

Most founders are strong on ideas, energy and direction. They are weaker on sequencing, follow-up, communication hygiene and repeatable accountability. That does not make them bad leaders. It just means their weakness is usually not ‘operations’ in the abstract. It is the practical work of turning good intent into consistent execution.

A strong Chief of Staff can complement exactly that gap. They can run the weekly rhythm, tighten preparation, draft internal communication, chase actions, improve meeting quality and help the executive team stay aligned. In other words, they solve the actual problem the founder is feeling. For a practical example, see this guide on strategic planning meetings. And if you are hiring for the role itself, start with what makes a great Chief of Staff.

By contrast, a COO often arrives with a broad mandate and a bias towards systematisation. That can be useful later. It is much less useful when the real need is someone who can help the CEO operate better inside a still-evolving business.

3. A Chief of Staff gives you more agility while the business is still changing

Scale-ups are still sorting out product, process, structure and talent all at once. That means you need someone who is comfortable with ambiguity and can help the business adapt without strangling it with process. That is usually a Chief of Staff job, not a COO job.

One of the common failure modes of an early COO hire is that they bring a playbook from a bigger company and try to impose it on a business that is not ready for it. The result is more layers, more meetings and more friction just when the company needs speed. A Chief of Staff can add discipline without killing innovation. It is the same trap I describe in Mind Your F**king Business: adding structure before the company has earned it.

If you are still iterating on go-to-market, refining the leadership team or launching new revenue streams, agility matters more than formal operational ownership. That is exactly where a Chief of Staff can help most. McKinsey’s scale-up research reaches a similar conclusion: the habits that get a founder through early growth often stop working when the business needs a more deliberate operating model.

4. A Chief of Staff keeps reporting lines cleaner than an early COO hire

This is the point many CEOs underestimate. When you hire a COO, the default move is often to make them the operational owner of most of the team. Suddenly the CEO has one direct report, the COO, and everyone else loses direct access and signal. That can create a serious culture shift overnight. It is closely related to the executive team trap: adding layers that look senior without actually improving leverage.

A Chief of Staff can provide a buffer without creating that hard layer. They can solve problems before they hit the CEO, improve communication between leaders and hold the rhythm together, while the reporting lines stay largely intact. That is a much lower-risk way to reduce founder overload. Harvard Business Review has written about the cost of becoming a bottleneck boss, which is exactly what an early COO hire can accidentally mask rather than solve.

If the business still benefits from the founder being visible and accessible, but the founder needs better leverage, a Chief of Staff is usually the more sensible answer.

When should you hire a COO instead?

You hire a COO when the business already has a repeatable operating model and now needs a serious operator to own how the machine runs. That point normally arrives later than founders think, because until then the bigger issue is usually leadership leverage, not operational ownership.

• You have enough scale and complexity that operations genuinely need their own executive owner.
• You want somebody accountable for cross-functional delivery, not just somebody helping the CEO stay on top of it.
• You are ready for clearer operating structure, process discipline and a more formal management cadence.
• You can define exactly what the COO owns, and how that differs from the CEO, CFO and commercial leaders.

If you cannot describe those conditions clearly, you probably do not need a COO yet.

How to decide between a Chief of Staff and a COO

• If the main problem is CEO overload, weak follow-through and fuzzy priorities, hire a Chief of Staff.
• If the main problem is scaling a known operating model across the business, hire a COO.
• If you still need flexibility and founder-led pace, hire a Chief of Staff.
• If the business needs an operator to own the engine, hire a COO.

In most founder-led companies around £5m to £10m in revenue, I would usually look at a Chief of Staff before a COO. Once you are north of roughly 100 people and the operating model is genuinely repeatable, the case for a COO becomes much stronger.

Three ways to take this further

(Ranked by impact, but also by how much effort you’ll have to put in.)

Book a call. If you are deciding whether you need a Chief of Staff, a COO, or neither, book a discovery call. We will work out what the real bottleneck is before you make an expensive hire you do not need.

Grab the book. Mind Your F**king Business is the blunt version of how to scale without adding pointless complexity. If this article resonated, start there.

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FAQ: Chief of Staff vs COO

Is a Chief of Staff senior to a COO?

No. They are different roles and they solve different problems. A COO is usually the senior executive who owns operations across the business, which means broader formal authority, more direct line management, and clearer accountability for how the machine runs day to day.

A Chief of Staff usually has less formal authority but far more proximity to the CEO. That makes the role powerful in a different way. They influence priorities, sequence decisions, improve follow-through and keep the senior team aligned. In a founder-led scale-up, that can be more valuable than raw hierarchy because the bottleneck is often around the CEO, not inside the operations chart.

Can a Chief of Staff become a COO?

Sometimes, yes. But not always. A good Chief of Staff learns the business deeply, so they can grow into bigger operating scope. The question is whether they also have the appetite and capability to own operations at that level.

Do small companies need a COO?

Usually not at first. Smaller founder-led businesses tend to think they need a COO when what they really need is better leverage around the CEO. Decisions are slow, meetings do not land, priorities keep shifting, and everyone waits for the founder to stitch things together. That is not automatically an operations gap.

A full COO makes sense once the company has a repeatable operating model, enough scale to justify executive ownership of the machine, and real complexity across multiple functions. Before that point, a Chief of Staff is often the cleaner answer because it gives the founder leverage without imposing a heavyweight operating layer too early.

What does a Chief of Staff actually do for a CEO?

A Chief of Staff helps the CEO prioritise, prepare decisions, run execution rhythms, improve communication, unblock teams and make sure the business follows through on what matters.

Should a Chief of Staff report to the CEO?

Yes. In almost every case, a Chief of Staff should report directly to the CEO because the value of the role comes from proximity, trust and speed. If they sit too far away from the CEO, they lose the context that lets them prepare decisions, challenge priorities and keep execution moving.

That does not mean they become a mini-CEO or a shadow COO. It means they stay close enough to the founder to understand where the friction really is and help the business act on it quickly. If the reporting line is diluted, the role becomes administrative rather than strategic, and that is when Chief of Staff hires disappoint.

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