Nice meeting you!

I work as Conversion Manager for some nice international companies and my own UserLegion startup.

I combine data, my background in cognitive psychology and scientific methods to optimize the (online) customer experience.

Through this process, I help to get insights about  customers behavior and teach our teams how to improve our products and services and earn more money by doing so.

I love working in multidisciplinary teams with strategists, business consultants, SEO/SEM/SEA professionals, graphic designers, developers and marketeers.

  • Persuasion review

    I perform expert reviews on online environments and suggest improvements based on scientific research and previous learnings.

  • A/B Testing

    Different content or layout ideas are tested on our products to fine-tune the optimal solution for your visitors.

  • Data Analyses

    Together with web- and business analists I use data to look for trends we can use in our business and customer communications.

  • Training

    I create and train teams to teach them how to continuously gain customer insight and improve conversions.

  • E-commerce specialization

    I mainly work with webshops/ e-commerce sites so you can be assured of domain specific knowledge.

greenTick Hands-on conversion optimization
greenTick Research based on scientific methods
greenTick Inspiration and training for your team

Areas of Interest


With over five years of experience with Magento shops I help companies make the right business decisions, prevent mistakes early and select the right development partners.


I studied Applied Cognitive Psychology at the Utrecht University in The Netherlands. I combine knowledge of Human Factors with the latest online reaserch to improve online communication and increase conversions.

Community Building

I’ve successfully built two large local communities and I’m working on number 3. I love sharing my experience to help you build yours to reach your business goals.

What I do


I’ll give you my ideas and actionable tips on how to improve your online business and get higher conversion rates.

A/B/MvT Testing

I can help you setup, run your tests and get statistically correct results and insights about your customers.


Need some inspiration? Hire me to present at your seminar to your customers or to give a workshop for your employees.


I can help you form a ‘customer intelligence team’ and embed a continues optimization strategy within your organization.


Let’s lunch!

If you have an interesting case or idea, invite me to lunch or dinner so we can exchange thoughts. Most days I’m close to Amsterdam. It’s fun!


Contact me and we can have a look at what I can mean for your business.

What others say about me

Michiel Schipperus

Guido and I worked together for two years. At ISM eCompany Guido initiated and executed many plans to put us on the map when it comes to e-commerce and Magento. Guido is someone with great passion for his work and a true professional. It has been a pleasure working with him.

Michiel SchipperusManaging Partner at ISM eCompanyISM eCompany
Yoav Kutner

Guido is one of the best “connectors” I know. He headed an amazing Magento community day in Holland which I was a part of

Yoav KutnerCo-founder – Magento
CTO & Co-founder
Oro Inc.
Kristel Verhasselt

Working with Guido was a great experience. Never met someone who knows more about building community, keep on the momentum, care about the user and product. He is one of those guys that are rare to find, for the enthusiasm, humor, go get attitude or Just Do IT.

Kristel VerhasseltBusiness Development DirectorLiving Tomorrow
Henk van Cann

Guido manages to work consistent on a job. His favorite task is research and to cultivate ‘a green field’ in some line of business / Open development. Do not expect reports every day, expect changes every day because he knows “where it happens” and is willing to share. Guido speaks little but does a lot. Very friendly guy and a joy to work with.

Henk van CannOwner2Value
Jos Benders

We recently had an intens training for Magento Enterprise from Guido Jansen. Guido Jansen explained us in a logic, business minded way the possibilities of our E-commerce system Magento Enterprise. He is an expert in this area and has the capacity to `translate technical` information into information which can be understood without technical pre-knowledge.

Jos BendersCo-founderBenHof Group
Jeroen van Eck

Guido is the leader in the Magento-space. Both his knowledge of and experience with the platform as well as his network is impressive. More importantly he is able to use the platform as an enabler; translating business requirements into a solution without losing scalability.
Guido is a true innovator within the (r)etail landscape; on top of innovation and opportunities using the open and social interwebs to connect and share.
He’s doing what he cares about, and that makes working with him not only inspiring, but also a fun experience with humor and creativity.

Jeroen van EckAstronautMangrove

Who’s worked with me?


Projects I’m involved in

Future of Magento

I believe there’s huge potential in the Magento Ecosystem, but some things need to change on an organisational level.

Check this introduction with my view of the Future of Magento.


I founded this Dutch community website for the Magento project which serves as a basis for the local community.