As digital product designer

I create digital experiences that

solve user problems
drive measurable growth
scale w/ design systems
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Digital product design

User experiences + interfaces that work.

Gebr. Heinemann

Streamlining the webshop experience

By enhancing checkout and cart flows, refining the design system, and implementing WCAG AA standards, I created a more inclusive and scalable user journey.
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Gebr. Heinemann

Deutsche Teilkauf

Simplifying property sales for older adults

For Deutsche Teilkauf, a company empowering homeowners to turn part of their property into financial freedom, I redesigned the digital onboarding experience to make the process clearer and more user-friendly.
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Deutsche Teilkauf

I help companies by turning complex challenges into simple, intuitive digital experiences.

I work with a clear structure that supports creativity and collaboration.

Over time, I’ve refined my process into a practical framework. My design playbook outlines how I approach digital product design: combining research, strategy, and creativity to turn insights into meaningful results.
While the framework provides direction, the tools and methods adapt to each project.

Learn
Turning insights into clarity

I start by understanding users and defining what matters most.

The Learn phase is about clarity. Transforming observations into insights that guide every design decision.
Using methods like interviews, journey mapping, and usability audits, I turn insights into structure -> creating a clear definition of the problem and the opportunity.
Illustration that shows a empathy map: What the user says, thinks, feels and does

Design
Turning ideas into actionable decisions

From concept to execution. Bringing clarity to creativity.

Using wireframes, prototypes, and design systems, I make ideas take shape -> ensuring usability, accessibility, and visual clarity.
Collaboration plays a key role here:
I design closely with teams to keep creativity aligned with user needs.
Illustration that shows a ui element which is selected by a mouse curser. A collaborator, like on a miro board is shown: Jeremy-Pascal.

Measure
Learning through validation

Testing, iterating, and improving with real users.

Through usability testing, analytics, and feedback loops, I uncover where the experience works -> and where it can improve.
This continuous iteration turns insights into measurable impact and keeps products evolving with their users.
An illustration is shown which shows the circle of feedback from prototyping to metrics or user feedback.
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Work experience

My roles and key projects.

Gebrüder Heinemann

Streamlining the webshop experience
Feb 25 -> Sep 25

Impact +
responsibilities

View case study
→

Ensuring accessibility in accordance with BITV 2.0

Based on an accessibility audit and our own screenings, we ensure that the webshop complies with WCAG “AA” standards. In addition, all input elements and forms are completely redefined in terms of contrast, clickability, and usability.

Enhancing checkout experience

As the central hub of the shopping experience, the cart serves as the funnel leading to the final purchase. Potential customers can find all key information about selected products here, along with various ways to explore additional recommendations. The optimized checkout allows both new and returning customers to complete their purchase. With a clear focus on modularity and scalability.

Design System

Reusable patterns, components, and rules form the foundation for future flows and features. This blueprint enables us to achieve global consistency across our system landscape.

Porsche Digital

Helping customers + dealers to build their deal together
Nov 22 -> Dec 24

Impact +
responsibilities

Porsche Digital
→

Optimizing the contact with the Porsche dealer

Streamlines the process for customers to review financing options, register their vehicle for a trade in, and connect directly with the Porsche Center.

Offer and contract generation

Equips Porsche dealers with a user friendly platform to streamline the management, adjustment, creation of offers and contracts, and reporting of sales.

Global fee management

Simplifies the process for dealers to configure, customize, and display fees in vehicle listings for customers.

Deutsche Teilkauf

Simplifying property sales for older adults
Jun 22 -> Aug 22

Impact +
responsibilities

View case study
→

Checkout system

Empowers customers to develop a unique and accurate estimate through well directed questions.

Global navigation

All touchpoints (desktop, tablet, mobile) now ensure that customers can find their way around.

Status responsive DTK Portal

After completing onboarding, customers will have the option to continuously check the status of their specific offer. They can also upload documents to further refine it.

Vergleich.de

Help people make smarter financial decisions
Aug 19 -> May 22

Impact +
responsibilities

Vergleich.de
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Real estate financing comparison

The customer is enabled to compare financing providers and banks and select the appropriate offer.

Real estate financing checkout

Once the customer selects their specific offer, they will be pointed towards additional relevant options and can request quotes from various providers at the same time.

Daily and Fixed Deposit Comparison

The customer is provided with an easy way to compare banks with respect to interest rates and security, enabling them to identify the right daily or fixed deposit deal.

Goldfuchs Studio

Bringing characters and worlds to life
May 17 -> May 19

Impact +
responsibilities

Goldfuchs Studio
→

Art direction + creation

Guiding the overall look and feel of projects, ensuring every element aligns with the vision and communicates impact.

3D Visualization

Transforming abstract ideas into realistic 3D visuals, enhancing storytelling with depth, detail, and perspective.

(Character) Animation

Breathing life into characters and scenes through fluid, expressive motion that engages and entertains.
Download CV as PDF

References

Here’s what clients and colleagues say about me.

Thank you very much for the excellent collaboration! It was not only a great pleasure professionally, but also truly wonderful on a personal level. Your outstanding UX/UI expertise has significantly moved our team forward. Always happy to work together again!

Kumsal Senguen

Product designer @ Gebr. Heinemann

Stefan has been a force in supporting our product design team. He is a very collaborative and enthusiastic designer. Always striving to improve and putting customers views first. Thank you very much for all your contributions. We hope to see you soon!

Peter Jacob

Team lead digital product development @ Gebr. Heinemann

Always up-to-date and highly versatile, from UI/UX to motion graphics, Stefan can handle it all and is therefore a trump card in any project. Over the past 12 years, I’ve worked with Stefan on various projects and have come to appreciate him as a reliable advisor and, above all, a true project rockstar.

Alexander Thies

Thies Online Marketing

Stefan’s professionalism and clear communication make every collaboration smooth and enjoyable, while his creative guidance consistently leads to new and innovative solutions. These exceptional skills enable him to deliver compelling and precise visuals every time.

Dr. Joachim Mogk

Founder and partner @ ORBIT

Stefan and I have been working together for years. What I appreciate about him is his deep professional expertise and his pleasant personality. He works independently, reliably, and meticulously - and always brings new solutions to the table. As a client, I trust him completely.

Matthias Held

Digital project lead & PO @ Interone

I have the pleasure of working with Stefan as a UX Designer and can truly recommend him. Stefan brings a wealth of expertise and a great sense for user needs. His designs are not only creative but also well-structured and highly user-friendly.

Kerstin Hahlbohm

Senior UX Design & Research @ Porsche Digital

Stefan delivers not only professional designs but also impresses with his ability to quickly grasp complex challenges and develop multiple solutions at once.

Asdren Hoxha

PO @ Porsche Digital

With his motion design skills, Stefan adds an extra layer of impactful storytelling to every project. He is highly organized, receptive to team feedback, yet always stays true to his principles and asks critical questions throughout the process that bring real added value to the projects.

Fred Voigtländer

Team lead design @ Matrix Internet

Stefan Holzheu

Digital product design

For the past 10 years, I’ve been shaping digital experiences. Together with clients, agencies, and teams, I connect UX and UI into a product that works with purpose.
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