Sebastian Müller

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Sebastian Müller

UI/UX Design Freelancer who loves designing for web and mobile.

I’m Sebastian, UI/UX Design Freelancer and Trainer from Cologne. Since 2008 I use my design skills mainly for mobile app design & responsive web design. I also hold UI/UX design workshops to show people how to become a better designer. Let’s create some beautiful and functional digital products together. Drop me an email.

  • Visual Design
  • UI Design
  • Sketch Workshops
  • Trainer
  • Lean UX
  • UX Design
  • Screen-Design
  • Mobile Design
  • Responsive Webdesign
  • Digital Design
  • Interaction Design
  • Sketch
  • Figma
  • Invision
  • Zeplin
  • Prototyping
  • Component Systems
  • Atomic Design
  • Pattern Library
  • Style Guide
  • Branding
  • Layout
  • Typography
  • Concept
  • Apps
  • iOS
  • Android
  • HTML5
  • CSS3


My passion is UI design: Working on the screen layouts & concepts, designing interaction elements, creating UI components, developing design languages & systems.

Since I see myself as a link between UX and development I like working very close together with the product team, UX designers and developers. The perfect working condition for me is the combination of remote + inhouse at companies as part of agile teams.

Don’t hesitate to contact me if you want to see my current portfolio & CV via E-Mail.


As a freelance designer I work together with others (e.g., as well as independent for diverse agencies, companies and start-ups. Some happy clients I can drop here are for example:


As a trainer I’m proud part of the Cologne based Experience Design Institute XDi and teach people to become Mobile UX & UI Design Specialists or Digital Designer.

In addition, I offer an individually adaptable Sketch – UI Design Workshop, which can take place remotely or in-house, as desired.

Wanna team up?

Cool. Let’s do it and build some beautiful & functional digital products.

You can hire me as a team, independently or for workshops.

Let’s talk

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