A look behind the scenes of the “DÜXX” high-rise project with Stefan, the overall project manager.

15 Sep 2026
Having started out as a working student, Stefan is now the overall project manager for the “DÜXX” high-rise project in Cologne. A conversation about sustainability standards, the LEAN method and his personal career path.
A young man in high-visibility workwear standing in front of a white wall Sven Hartmann / ZÜBLIN
Sven Hartmann / ZÜBLIN

How did you become a project manager?

Even whilst working as a student trainee, I was able to gain my first practical experience on a ZÜBLIN building site. After completing my Master’s degree in civil engineering, I joined the company as a technical trainee in 2016.

I then moved into the project business as a site manager, which laid the foundations for my understanding of operational processes. After a period working in tender processing, I returned to the construction site to work on the overall “MATTES & DÜXX” project. During the first construction phase, ‘MATTES’, I initially took on a liaison role between the construction and project management teams. For the current second construction phase, ‘DÜXX’, I am now responsible for overall project management.

An employee is sitting at his desk in a site hut ZÜBLIN

What is your day-to-day life like as a project manager?

It’s varied and full of different tasks. My day-to-day work involves coordination meetings with the project team, discussions with partner firms, specialist planners, the client and the authorities, as well as negotiations and the awarding of contracts.

A large part of my work takes place at my desk or in the meeting room. At the same time, however, the goings-on at the building site mean that I’m regularly out on site, experiencing things first-hand as the project unfolds.

What is the biggest challenge facing the ‘DÜXX’ project?

We are constructing a high-rise building, which means there is a very high density of trades working both above and alongside one another, often at the same time.
To give an example: whilst the concrete is being poured for the ceiling right at the very top, work is already underway on the floors below – including window fitting, interior plastering, drywall installation and the fitting of building services.

Added to this are the many differing interests of all those involved, tight scheduling constraints and, due to the inner-city location, very limited space. This calls for a clear plan, forward-thinking, targeted coordination, clear lines of responsibility and a strong team.
Accordingly, our project team comprises around 20 colleagues. 

What is particularly important to you when working as part of a team?

For me, mutual respect and appreciation form the basis of collaboration. This naturally includes giving open feedback and accepting constructive criticism. It is important to me to take responsibility and have the courage to make decisions when the situation demands it. 

Challenges are part and parcel of the job and must be actively embraced. It’s just as important to me that we celebrate our successes together and maintain our enjoyment of working on the project.

  • Challenges are part of the process and must be actively embraced. It is just as important to me that we celebrate our successes together and maintain our enjoyment of working on the project

    Stefan
    Overall Project Manager, DÜXX
  • In my view, continually reviewing, simplifying and streamlining processes ensures order and stability in day-to-day project work.

    Stefan
    Overall Project Manager, DÜXX

What skills are particularly important in your job?

As well as technical knowledge, organisational skills, decision-making ability and strong communication skills are crucial for me. You need to keep track of the big picture, set priorities, reconcile differing interests and remain objective and solution-oriented even under pressure. Equally important are the ability to work in a team, reliability and a good understanding of people.

What are the distinctive features of your current project?

‘DÜXX’ is a DGNB-certified sustainable construction site. We are implementing high sustainability standards right from the construction phase.

The focus is, amongst other things, on resource efficiency, compliance with environmental standards and social responsibility, particularly in our dealings with local residents and neighbouring businesses. We are supported in this by group-internal units that provide us with advice and carry out audits.

What have you implemented in terms of 5S? What are you particularly proud of?

The 5S principles – Sort, Set in order, Shine, Standardise and Sustain – have been with us from day one on the construction site and are immediately visible to everyone. From the organisation of the site facilities areas (BE areas) and clearly marked escape and access routes right through to the waste disposal points on each floor.

Equally important to us is the high level of acceptance of the 5S methodology amongst our partner firms. You can set guidelines, but implementation depends on the people on site.

Will any STRABAG teams be moving in as well?

No. Unlike with the MATTES project, the entire space has been let to external tenants. It’s a shame, really, as the view of the cathedral from the upper floors is something quite special. 

Thank you for the interesting insights into your day-to-day work. We wish you and your colleagues continued success!