Thomas van de Werff • Portfolio

I design for Simplexity, transforming complex systems into easy to use products. Good UX is invisible, but never accidental.

My name is Thomas, a Product Designer with a doctorate in Interaction Design. I’m currently simplifying change configuration of high0tech machinery @ ASML.

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Scroll down to find a selection of my work and to read more about me and my work experience.

Some of my work

Here’s a selection of my past work.

I redesigned the invoices section of our platform to support new credit note functionality, improve usability, and align with our design language. We reduced overdue invoices, sped up payments, and cut support tickets. Read more
I initiated and led the research and design for the analytics environment in the Mobile Marketing suite, from need-finding to evaluation. The actionable data and insights increased adoption and campaign performance. Read more
I led the maturation CM.com’s Design Language System, Aurora, from a basic component set into a fully documented and widely adopted design system. This increased consistency, usability, and team alignment across products; turning the system into a foundation for scalable product design. Read more
I redesigned the Campaigns app to accommodate rich media. Close collaboration with PM, CSM, and Engineering, to increase conversion and success rate, and decrease conversion time and error rate. Read more
Doctoral dissertation about interactions with connected lighting systems and how its value permeates throughout the value chain. Read more

About me

I’m a Product Designer with 10+ years in B2B SaaS and a PhD in Interaction Design. I help teams ship clear, usable, and scalable software by combining strategic research, lean execution, and strong design systems. I relish complexity, and transform it into simple interfaces. Experienced in leading design efforts, mentoring, and collaborating with product and tech to shape roadmaps and elevate product quality. I’m self-starting, proactive, and I love to learn.

Want to read more about me and my professional past? Feel free to check out the details on the About me page, or download my CV.

Want to talk design? Let’s do it! Reach me on LinkedIn or via email at letstalk@twerff.com.

What people I worked with say

Mario Silva
Engineering Lead @ Sendcloud

Thomas is decisive and balances quick decision-making with a foundation in research. He was instrumental in initiating feedback systems for Sendcloud’s navigation redesign without delaying implementation. Thomas excels in collaboration, as shown by his ability to lead UX research, interview customers, and communicate findings clearly to the team. He ensures everyone is aligned without micromanaging. Thomas effectively combines ambition with practicality. His user-centred approach is evident in his deep involvement in user interviews to ensure solutions are tailored to merchant needs. Thomas’s processes are well-documented and scalable, ensuring the team can build upon his work independently.

Nicolas Biglié
Sr. UX Designer @ Sendcloud

I’ve had the pleasure of working with Thomas since the beginning of his time at Sendcloud. We worked incredibly well together, understanding each other’s strengths and creating a great partnership. Thomas was always proactive in seeking collaboration, validating our assumptions with users, and bringing clarity and motivation to our projects. I’m confident that his background in user research makes him an even stronger designer. His deep understanding of users and ability to align design with their needs will be a huge asset, and I have no doubt he’ll succeed and thrive.

Amp Varavarn
Principle Product Manager @ Sendcloud

I’ve had the pleasure of working with Thomas, and he is an exceptional UX designer. He has a unique ability to represent the user’s voice, which has been critical for our product development. His insights and thoughtful research have consistently guided our team toward practical and user-centred solutions. Thomas is also very proactive and collaborative. He involved people in his process by sharing user interviews and key findings in an accessible way. He’s always open to feedback, and I’ve seen him make significant improvements, like enhancing the structure and focus of his workshops based on team input.

I highly recommend Thomas for any team looking for a driven, insightful, and collaborative UX professional who deeply cares about both the user and the business.

Davey van Ginneke
Product Manager @ CM.com

I enjoy working with Thomas and brainstorming together on how we can make our product even better by addressing not only the current needs of our users but also those of the future. He gets involved early in the refinement of new features, and that involvement clearly shows in the quality of the output.

Thomas brings a clear and refreshing perspective on usability and always considers how developments within the domain fit into the wider platform, and vice versa. This approach greatly benefits the overall quality of our product portfolio. On top of that, Thomas is a fantastic colleague who contributes to a positive and motivating team atmosphere.

Daan Jobsis
Sr. UX Designer @ CM.com

I appreciate the way Thomas tackles the bigger UX challenges in the company: “go big or go home” is his motto. For instance, he recognised the broader value of introducing FullStory, rather than focusing only on fixing smaller issues within his own team or applications. Of course, he takes care of those smaller tasks as well, but where Thomas really shines is in connecting people and teams to achieve shared goals.

He’s a true team player, always leaving room for others to step in, and he’s very open to input and feedback, which makes working with him a pleasure. I especially enjoyed the Mission and Vision workshops he organised: an enthusiastic showcase of how to gather meaningful input from very different types of UX designers (both introverts and extroverts) in a short time, and in a fun, engaging way.

Lisette Spoelder
Managing director @ People in science

Thomas is a pleasant, communicatively skilled conversation partner. He speaks in an engaging and lively way, but also listens attentively to others. He combines analytical abilities and a strong scientific affinity with a people-oriented interest.

Thomas is creative, both in thought and in action. In addition, he has commercial awareness and business talent. Thomas is proactive and his enthusiasm is contagious. He has great perseverance and is results-driven. He is collegial and helpful.

Simplexity, User-Centric Thinking, Design System, Analytics Dashboards, Conversion, Faster Payments