Incompany Management Trainer | David Buirs

Your scale-up suddenly has five new managers due to rapid growth. Now what?

David Buirs is a leadership and management trainer in Amsterdam. This post covers leadership training scale-up: how to prepare new managers when your company grows fast. You will read why a strong specialist rarely becomes a strong manager on their own, how to protect culture and psychological safety during growth, and why a programme of months sticks better than a single training day.

Last year you were eighteen people. Now you are seventy. Sarah from Product is a team lead. Tom from Sales runs the sales team. They are brilliant at their craft. Leading a team is something they have never done.

That is the discomfort you feel creeping in. You promoted your strongest people. And you see the first cracks appear.

Communication gets clunky. The sense of ownership fades. The atmosphere in the teams changes slowly. People complain about too much work and a role nobody explained well.

As an HR manager, L&D lead or founder, you know this will not fix itself. The question is how to turn it around before talent walks out. That calls for real leadership training scale-up, built on the dynamics of this exact phase.

Why a Scale-Up Needs Different Managers Than a Startup

A startup runs on everyone-knows-everyone. You align over coffee. The founder knows the status of every project. The culture is in the air and needs no explaining.

At seventy people, that stops working. New colleagues arrive every month. The family feeling fades. Departments grow more specialised and start speaking their own language. The founder can no longer see everything.

A large company has processes for this. A startup has speed. A scale-up sits right on the fault line. Just enough structure to tame the chaos, while keeping the speed that made you grow.

And who stands on that fault line? The new manager. Someone used to the implicit, who now has to carry the explicit.

The Leap From Specialist to Leader

The skills that make someone a top seller or strong developer are different from the skills a team needs. Sarah became team lead because she was the best. Now she is judged on something she never learned.

A good specialist solves problems themselves. A good manager makes sure others solve problems. That is a completely different reflex.

So many new managers keep doing what they know. They dive into the work. They take tasks over. Their team learns to wait. And that creates the very lack of ownership you are worried about.

Good leadership training scale-up starts at that leap. We make the old reflexes visible. And we practise the new behaviour until it feels natural.

Handling Constant Change

In a scale-up the course changes regularly. A pivot, a new market, a reorganisation of teams. For the founder this is normal. For a new team it can create unrest.

The manager is the one who translates this change to the work floor. Sarah has to guide her team through a course correction while everyone keeps their bearings. That asks for calm, clear communication and the ability to carry uncertainty.

You learn this by practising with situations that genuinely play out in your company. That is what I design the programme around.

Protecting Culture While You Grow Fast

In the startup phase you passed on culture without thinking about it. New people absorbed it on their own. During hypergrowth that stops. When you hire every month, culture has to be passed on deliberately.

Managers become the culture carriers here. Their behaviour decides whether the old values stay alive or slowly evaporate. A new manager who misses this passes on a different culture than you ever intended.

Two things deserve extra attention. Preventing silos, because specialised departments otherwise turn inward. And protecting psychological safety, the foundation on which people dare to speak, admit mistakes and challenge each other.

Psychological safety sounds soft, yet it is the engine under every performing team. Google's research into effective teams pointed to it as the single most important factor. In a scale-up full of new faces, it is also the first thing to go when nobody guards it.

Why Single Training Days Rarely Stick

Most trainings fail to deliver. That comes down to the Ebbinghaus forgetting curve. Within a week, about ninety percent of a one-off training day has already disappeared. Within a month, almost nothing remains.

The brain learns through meaningful repetition, spread over time. A one-time infodump fades fast. That is why a programme of months works where a single day fails.

My approach focuses on a few essential models, chosen around the needs of the group. We repeat them in a pleasant and effective way, until they stick. You see it on the work floor right away. Managers actually use the tools in their daily work. That is where the real impact for the organisation sits.

Leadership and AI

The way we work is changing fast because of AI. In tech especially, people work with agents more and more. That asks for a different way of managing.

Tasks that used to take time are getting automated. Critical thinking and human judgment become the most important skills. Managers guide this process and put the focus where humans make the difference.

In the programme, your managers learn to handle this. How do you lead a team that uses AI agents? How do you keep connection and critical thinking alive while more and more people lean on AI?

The Power of 1-on-1 Coaching Alongside the Group Training

As an ICF-certified Co-Active coach, I also offer every participant individual support. The combination of group training and personal coaching is strong. For leaders at director level, executive coaching is a logical deepening.

In coaching, we go deeper into personal challenges. The fear of feedback or uncertainty about one's own role gets room there. I am fully committed to my participants and I am there between sessions too. They can always reach me when a difficult situation comes up at work.

Personal Leadership as the Foundation

Leadership is as much about who you are as what you do. Real growth starts inside the manager. So we build on personal leadership as the foundation under every successful team.

Managers learn to trust their own style. They learn to make choices amid uncertainty. That asks for grounded psychology and self-insight. We practise the conversations that genuinely matter in your organisation. For organisations that want to tackle this structurally, a leadership track is a logical step.


Choose an Approach That Fits Scale-Ups

Good guidance for your managers saves you a lot of time and money in the long run. It means less turnover and more room to grow.

Interested or curious? Let's chat. Plan your free introduction here. Zero obligation.

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