Hi, I'm Paul

i design & develop digital solutions_

I'm an UX / Product design specialist with 9+ years of experience and co-founder of the internet-marketplace gearo.de.

I focus on measurable user-centered design, pragmatic process optimization and the sustainable efficiency of automation.

I have gained experience working in both small and medium-sized hyper-growth startups, as well as established enterprises.
currently Lead Product Designer (PENNY App) at Rewe Digital

Selected Cases

Work experience

REWE digital – PENNY App

April 2019 - present, Cologne & Berlin
Lead UX/UI Design for Penny App

Over the past4 years, I have played a key role in the strategic product development of the PENNY App, assuming full responsibility for conceptualization, UX/UI design, and testing. By repositioning the app as an interactive experience rather than a digital offer brochure, I successfully designed, prototyped and tested multiple innovative features. This resulted in a remarkable 20x increase in app usage, reaching millions of monthly active users.In addition, I developed white-label software solutions within the existing system, streamlining the workflow for the development team and empowering the marketing team to manage campaigns more effectively.

gearo GmbH

Sep 2015 - April 2024
Founder & Lead UX Designer

The marketplace gearo.de is a completely custom-built platform both design and code-wise. From the idea in my bachelor thesis to a self-sustaining and growing business with 20k+ verified Users, 25k+ equipment-ads (worth >40mio. €) and around 400 transactions/month, the product and every feature e.g. the automized invoicing-system, digital handing-and return-protocols or the self-written ranking algorithm is a strong combination of gathering user needs, rapidly prototyping KPI-driven MVP‘s, User-tests and working closely with our developers.

Vitaliberty GmbH

Sep 2018 - April 2019, Mannheim/Cologne
Lead UX/UI Designer (contract)

As the lead designer for their B2C health-app, I conducted several UX-tests using high-fidelity prototypes, developed a design-system from scratch and increased the premium-user conversion through enhanced benefit-communication. Together with the team I conceptualized the future product-strategy, reporting to the head of product.

REWE digital

May 2018 - Sep 2018, Cologne
Senior UX/UI Designer  (contract)

I have actively contributed to multiple projects focused on recipe-related features across various digital touch points, including web and point of sale (POS) systems. In these projects, my responsibilities encompassed end-to-end tasks such as designing, developing, and conducting user testing.

Provinzial/Sparkasse App

Jan 2018 - Mar 2018, Cologne/Düsseldorf
Lead UX/UI Design (project)

Through conducting insightful workshops with employees from both Provinzial and Sparkasse, I developed a concept for an internal app designed to serve as a reliable and unified source of information. This concept aimed to address key challenges by improving internal communication, facilitating quick and easy access to relevant insurance products, and establishing an internal news and knowledge hub. Following the workshops, the prototype underwent targeted testing with the intended audience at their own fair, allowing for iterative development based on valuable feedback and insights gained from the evaluation process.

Freelance projects

2013 - 2019, Cologne/Düsseldorf
Design Strategy / UX/UI Designer

various projects

How I work


  • Lean Product development
  • Strategic & Data-driven
  • High degree of self-initiative
  • Pragmatic thinking
  • Information Architecture
  • Live-Data prototyping
  • Wireframing & Userflows
  • User Testing

UX / UI / prototype

  • Pen & Paper
  • Figma
  • Sketch
  • Origami Studio
  • Axure
  • Principle
  • Invision
  • Adobe Design Suite


  • Python
  • html 5
  • css
  • javascript basics
  • Swift (intermediate)
  • data science libraries such as pandas
  • Webflow

Want to work together?

Drop me a message:    LinkedIn