guerillagirl is the Berlin based design studio of of → Stefanie Kegel.
She is specialised in UX and interactive design, helping her clients in creating user interfaces for applications and websites that are easy and fun to use, with an eye for both: business goals and customer needs.

Latest: Hellofresh, UX consulting, → Landing Page webdesign, Newsletterdesign, Usability optimization of CS backend, content strategy consulting blog // Axel Springer,→ Die Welt digital: interactive Feature, interaction design, prototyping and user testing

Brain Appeal, Typo3 Agency Mannheim, → Sumitomo Soft Launch, culture research, conceptual design, webdesign // CRYTEK, → Arena of Fate Forum visual web design, customized icondesign

Say hello, read the blog or view/*download portfolio here.


Die Welt digital: interactive feature. Read → case study


I see computers as a human-technology conversation tool – and I think that technology should ‘speak’ with humans in a human ‘language’, not vice versa.
Technology should serve humans in a friendly, human way and support them in accomplishing their goals, like you’d wish a good and polite assistant would help you. An elaborated design can achieve this.

I enjoy creating collages and graphic stuff as well

I love to do graphic design for posters and flyers as well.



Client: HelloFresh // Landing Pages, conceptual design, Newsletter design, GUI Specifications, Blog strategy consulting, CS Backend usability makeover and UX consulting.


Client: Sitemap / Information Architecture Spec, Webdesign/ Art Direction for a Redesign. This was a Geekettez Team Project.



Press & Publications

‘Stefanie Kegel on using social psychology in interaction design’ Interview with Lauren Kelly from Form for thought, 04.2016.

‘More Than Just Pretty: A Guide To UX Design For Startups’, Interview with Charmaine Li for Factory Berlin, 04.2016

‘Portfolio of the month’, PAGE magazine Issue, 07.2014 (print & online)

‘Flatterhaft beständig’, Interview zum Thema Freelancing, weave Magazine, Ausgabe 11.2012

‘Wireframes und Prototyping im Interfacedesign’, webstandardsmagazin, 03.2009
PDF download


‘Intercultural Aspects in Interface Design’ [upfront meetup Berlin, 2016]

‘Softwarebasierte Barrieren im Designprozess einreißen mit Sketch App’
Artikel im Studio Blog [UIG Frühjahrstagung, 2016 – Geekettez Team Session]

‘Ready or not? No UI’
Vom Verschwinden des Graphical User Interfaces. [Usability Kongress Frankfurt, 2013, Webmontag Mannheim, 2013, Geekettez Team Session]

‘User Experience, das Fundament’
[World Usability Day, 2012 Mannheim, Geekettez Team Session plus Workshop]

‘Storytelling as a Design Tool’ [Agile Design Camp, Hamburg 2011]

‘It’s all about communication. HCI made easy’ Wie schaffen wir es aus puren control panels Systeme mit etwas mehr Persönlichkeit zu machen? [Webmontag Mannheim, 2011]