Paymentwall offers summer internships. + if you like what you do and if we like what you do, you could go back to Germany and continue working from our Berlin office.
Search thru the jobs at paymentwall.com
Thank you for answer!
I looked thru the website and saw that you also have an office on Market St. San Francisco! I did an internship on Market St. and 1st St. at a german based start-up company last year.
I also do an Android App for SF/Berlin based start-up called versioneye.com
The subject of my Bachelor thesis should be something about mobile development (native or web) or frontend web development. I could start working from February 2013.