Interim manager for

  • Projects & programs 

  • Digital & IT

  • Marketing & Growth

It’s my mission to make a lasting and positive impact
on teams and organizations

To achieve that, I bring vision & structure,
take the first steps,
and lead the change from there

Wouter Sleyffers Consultancy
  • Projects & programs

    Project, program or general management

    “Alone may be quicker, together brings you further”

  • Digital & IT

    Digital Transformation

    “A people matter disguised as a technological matter”

  • Marketing & Growth

    Strategy and execution in marketing & sales

    “Satisfying customer needs profitably”

wouter sleyffers consultancy
wouter sleyffers consultancy
wouter sleyffers consultancy
wouter sleyffers consultancy
wouter sleyffers consultancy
wouter sleyffers consultancy

What I do

  • I specialize in program management that drives growth, efficiency, and strategic alignment. Throughout my career, I have successfully led complex, multi-stakeholder programs across various industries.

    In leadership roles I managed multidisciplinary teams, overseeing marketing, operations, and sales while ensuring data-driven decision-making. I set clear objectives, streamline execution, and drive measurable results to achieve growth.

    I have managed complex, international and multidisciplinary change programs in large corporates. I have deep knowledge how to create governance to accelerate change and innovation.

  • I have learned how to align digital and IT transforamtion with business growth.

    In consulting roles, I gained extensive experience in digital transformation, and operational change as a result of that. Managed large programs driving change and business impact.

    In addition, I have led digital transformations, integrating marketing with product innovation and customer experience. I have successfully introduced new business models, optimized digital customer engagement, and built scalable frameworks.

  • I have extensive B2B marketing and sales strategy and execution experience. In leadership roles I developed and executed marketing strategies, leveraging data-driven insights to refine customer acquisition and improve conversion rates.

    I gained valuable international experience at 2 Paris based scale ups, managing remote teams, optimized sales processes by improving client and user analysis, enhancing lead qualification, and refining the sales funnel to drive efficiency and conversion.

    My experience spans industries such as consulting, tech, digital platforms, and professional services, where I have successfully led sales teams, developed go-to-market strategies, and closed high-value deals.

    My approach to B2B sales is rooted in consultative selling—understanding client pain points, positioning tailored solutions, and fostering long-term partnerships.

    Beyond that, I have a strong track record in aligning sales with marketing and operations, ensuring a seamless customer journey and sustainable revenue growth.

    • Sales funnel growth: automating and optimizing marketing campaigns and SDR

    • Accelerating sales: analyzing existing customer base, determining the best-performing customer segment, deep targeting this customer segment

    • Sales growth: upselling services based on customer and market analysis, introducing/scaling up Customer Success 

    • Accelerating growth: testing/introducing existing product/market fit in another country/region

    • Commercial growth: supporting organizational improvements through automation, job/role allocation, and competency development

About me

It’s my mission to make a lasting and positive impact on teams and organizations. To achieve that, I combine my experience and capabilities to:

  • Bring vision and structure, by swiftly understanding the situation at hand and put to the table my data driven understanding of the change in a structured way forward, with clear goals and results

  • Take the first step and start the project or transformation with a timeline, agreement on what need to be done, including budgets & milestones and form the team of people and wider stakeholders

  • Lead the change with a specific eye on proper delivery, detailed when needed, fast when required, focused on results recognized and carried by the team, organization and wider stakeholders

I have more than 15 years in consulting, digital & IT transformation program management across corporates, scale-ups and start-ups. I specialize in turning complex challenges into clear, measurable growth.

I gained my experience and capabilities by leading complex, international (Germany, France, India), multidisciplinary change programs and teams in large corporates and smaller businesses, building the right governance to accelerate innovation and deliver results that stick. My strength is balancing strategic foresight (“doing the right things”) with operational excellence (“doing things right”).

I execute my work and decisions driven by the key lesson of my Master in Marketing: “marketing is satisfying customer needs, profitably”.

As a person, I am optimistic, enthusiastic, direct. I try to live by four rules: speak impeccable words, take nothing personal, do not make assumptions, always do your best.

In my free time I have a wide array of interests, currently mainly focused on a fitness training and food program, and classic and youngtimer cars.

Let’s get in touch