We are Mobile Jazz, a collective of excellent engineers and designers with a strong focus on everything mobile and beyond.
We're doing Android since the first 1.0 release in 2008 and iOS since 2009. We also do Mobile Web and cross-plattform (PhoneGap & Titanium).
Check us out here: http://mobilejazz.cat
If you need more references and testimonials have a look here: http://stefanklumpp.com/testimonials.html
If you've any questions please get in touch with me via firstname.lastname@example.org - happy to answer any questions :-)
PS: We've worked successfully with other HN members before.