I've been building apps since 2008 and have a lot of experience on multiple platforms and with multiple frameworks. If you can dream it, I can build it. Some of the projects I've worked on in the past are protected by NDAs. Below are some high profile ones that aren't. Check them out.
Fitocracy is a fitness social network application that had a full suite of features like feeds, profiles, groups, chatting, workout tracking, and more. I was responsible for building the entire iOS app. Over 3 years, I architected the large application in order to make fast-paced changes as the company pivoted its strategies while maintaining the ability to delight our users with fun and interesting animations and interactions.
The company was acquired in 2016.
Daily Burn is another fitness application (there's certainly a theme here -- I care about health & fitness and like working on related applications). It is focused on video workout content with an on demand model. Think Netflix for video workouts you can do at home. They also launched a live streaming, daily morning workout while I was working with them.
I built their Apple TV app prior to the launch of the test latest Apple TV. Apple had asked them to be a launch partner for the new devices and Daily Burn asked me to build that app. I spent 2 weeks in Cupertino and 2 weeks in New York working closely with their designer to get the app ready for launch. Then I got to see it live on the demo devices in my local Apple Store. Pretty damn cool.
Most apps can't do that much without a backend service that exposes an API. I build those too.