I always do enjoy stumbling across a portfolio of a designer that is also working as a front-end developer. The bridge/gap between the two titles are totally clashing with so many aspects of the job that makes everything more technically functional.
Designing mobile applications require a profound understanding of the problem, the audience and the goals of your product. It's a task that involves UX designers, researchers and pretty much everybody that uses that problem. Of course, there's a very important factor that is the trial and error. Assumptions should be tested in my opinion through rapid prototyping. That is a subject for another post though, for this one I just wanted to share a quite beautiful visual design work created by Karol Cichoń for the MyWallet app.
MyWallet is a mobile finance management application. It allows to control personal budget and increase savings efficiency.
For more information about Karol, check out https://www.behance.net/cichonkarol/