Want to improve your teamwork?

We can teach you how

we HELP you build a happy, high-performing team



We take time to understand your situation and with a step by step approach we help you to improve these aspects that will turn you into a high-performing team. We work with the best experts and guarantee a culture-fit delivery of the program. We make use of collective intelligence and neuroscience-backed learning methods.
Creating well-connected, inclusive teams is our expertise!

Find out what Yellow can do for you today.
Great teamwork is closer than you think!
“Our collaboration with Yellow has been key for the success of our D&I Program implementation. Since the beginning they have understood our needs, and adapt to our people. Their knowledge in this field as well as the use of last tech for online training has been fundamental for the great feedback received by our team members. Thank you!”
Belinda Martinez, HR Manager Diversity & Inclusion, Ubisoft Barcelona Mobile
"My team has grown bigger, stronger and more reliable. I have not lost any single member instead got many more, inspired to share what we developed with Yellow in our team-building session in Barcelona.
This was several years back and is still delivering success."
Ovidio Cardona, VP Global Cybersecurity Operations at SAP, Mannheim, Germany


Training and coaching
We can help you with the following custom-fit services. Please, select the program that interests you to continue reading.
Diversity and Inclusion workshops

Create an inclusive work culture

Diversity & inclusion workshops
Get your team on track

Get your team on track

A program to boost your team's effectiveness
Training and Coaching for leaders

Inspire your team

Training and coaching for agile leaders
Workshops for teamplayers

Shine a light on you

Workshops for team players

You are one step closer to connective teamwork!

"Yellow exemplified professionalism, thoughtfulness, and positivity in all their interactions with our team.
I would highly recommend them: an agile, engaging, option to provide thorough attention to your Learning and Development training plans."
Heather Harrison, Talent Growth Director, Vivaldi Group, New York City, USA.
Marianne Slotboom, founder of Yellow


Hi, my name is Marianne Slotboom, I am the founder of Yellow.

We are driven professionals - experts in our fields - on a mission to empower motivational leadership and build inclusive teamwork within tech organizations. Each of us has over 20 years of international experience in consultancy, training or coaching and we are deeply connected to prominent global business schools.

Our programs are interactive and will inspire you as they are innovative and based on the latest insights of learning. You will improve your skills while practicing with your own situations.

We work with international tech companies that span continents and cultures. Barcelona is our home.

We help you build inclusive and high-performing teams!



Clients who put their trust in us
See more Clients


Marianne opened the eyes of our female webdevelopers, regarding personal strength, presence, self-confidence. It was empowering for our students to see how driven Marianne is as a professional, and how accessible and open she is when it comes to sharing experiences.
Henriette Hettinga
Henriette Hettinga
Project Manager, MigraCode Barcelona
I’m proud that I participated in the Yellow Program for Women in Tech. It was shaped in a series of key topics and super-well balanced between theory and practice. Marianne and Jose are a perfect tandem and you can feel this in every session. What I specially noticed is the way they helped us leveraging on our own internal experiences and how each of us in the group despite our background got its own flavor of enrichment and learning.
Laura Grau
Laura Grau
Director Of Engineering, NEW WORK SE
With Yellow our team improved their leadership skills through advice and different dynamics, both theoretical and practical. This support will undoubtedly allow our team to continue growing as professionals and as leaders.
Sergi Bech
Sergi Bech
CTO Atrápalo, Barcelona
With the Women in Tech program from Yellow, I have learnt how to be more confident about myself in situations like negotiations, dealing with conflicts and making my opinions being heard in meetings. Doing this together with a group of women in a similar position, helped me to achieve my goals in an open and safe space.
Laura Orán
Laura Orán
Software Engineer, Xing
Yellow has been a fantastic support throughout the planning and execution of the leadership training for our team. Marianne's approach in helping me design the practical training to our needs worked fantastic for us. Our leaders are very enthusiastic with the learning outcomes.
Sylvana Sansone
Sylvana Sansone
HR Business Partner EMEA of Headway Digital, Barcelona
Yellow provided an integral program for us, in which we addressed important leadership skills. The approach was well focused on our specific needs, which has contributed enormously to the value of the program. It was easy to apply new insights in daily work.
Kitty van Dijk
Kitty van Dijk
HR Manager of KPN Magnum, Madrid
As a user experience designer it is important to get your message across and I am grateful that I could bend the general rules to my personality. Marianne and Jose created the ideal atmosphere to open up without hesitation. The program was tailored to our needs and the opportunity to practice with an actor was super!
Jacqueline Berghuis
Jacqueline Berghuis
UX/UI Designer - Brand Designer
With group dynamics and practical concepts Yellow helped us to reach our objective: to improve our relationship and increase trust within our team. We enjoyed a team training with the right atmosphere to get the best out of every team member. It has led to long-term constructive collaboration.
Daniel Puga
Daniel Puga
HR Manager Iberian Region at Nobel Biocare, Barcelona
The teambuilding training was engaging, thought provoking, and fun. It was a great experience and some even stated it was the best team building exercise they have attended. The training strengthened the bonds with our colleagues and showed us areas where we could improve as well. 
Andrea Werle
Andrea Werle
Global Director Cybersecurity Incident Management SAP, Palo Alto, USA
Yellow provided a great teambuilding program and we are still experiencing the benefits. The team improved significantly in their interpersonal communication, the way they handle the workload and how they address responsabilities. We have learned a lot and developed significantly as a team. 
Petra van den Dries
Petra van den Dries
Teamleader at UWV, Eindhoven
The trainer was very well organized, active, participatory. She introduced practical content, which succesfully brought out our issues working in multicultural settings. I’ve learned a lot from a great professional!
Augusto Sappia
Augusto Sappia
Participant Intercultural Session, Barcelona
I recommend Marianne to anyone who wants to have a clear view on personal changes they can make to function in a competitive, stressful environment. Her 'down to eart' analyses will enable you to change perspective; on yourself and on the situation at hand. You will be amazed how quickly you see the results.
Naomi Williams
Naomi Williams
Trade Officer at Dutch Ministery of Foreign Affairs, Barcelona
One of the best trainers I’ve ever met. Especially in the field of problem solving Marianne is capable of bringing a group of trainees to a much higher level. She is a type of trainer who makes time relative. A very nice person with a lot of ambition and humor.
testimonial Peter Heerschap
Peter Heerschap
Managing Director of TEM, Rotterdam, The Netherlands
Marianne knows how to connect to her audience. She uses clear examples and shares her wide experience in a way that keeps the audience mesmerised. She is one solid example of teaching with the right doses of theory, practice and fine sense of humor.
Ferran Ferrandis
Ferran Ferrandis
Head of DCI (Data Center Infrastructure) at T-Systems Iberia, Barcelona
I have experienced the problem solving method that was taught to our team as very useful. The way the trainer enabled us to solve our problems was very special for us. We immediately felt her commitment and her very pleasant way of training.
Jo Koch
Jo Koch
SHE Advisor at Stork a Fluor Company, Maastricht Area, The Netherlands

My team has grown bigger, stronger and more reliable. I have not lost any single member instead got many more, and they help me to inspire the others to share what we learned with Marianne. I definitely recommend her personally, and surely will ask for her help again in the near future. I got to know Marianne when I was leading a global virtual team of IT Security Specialists. We were having a technical workshop in Barcelona and two intensive sessions with Marianne, with the aims:  1. Ensure that the team knows, understands and overcomes communication challenges; 2. Using the differences to enable the team for success breaching silos; 3. Help team members to become brothers in arms (engage, act, support and deliver as one team, one voice). This was several years back and they are still delivering success.


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