Ask HN: Researcher seeking app developers

I'm a PhD student and I'm researching how smartphone app developers make decisions and tradeoffs they face. I'm looking for smartphone app developers to take a 20-30 minute survey. It's here: http://cups.hnews.sgizmo.com/s3/ You have to be 18+ years (due to university rules; there is nothing adult rated). You will receive a $5 Amazon gift card in return. Many thanks in advance.