I’ve worked on around 30 Apps in the last couple of years – alone and in teams. Not only for phones but also for tablets and web using countless technologies. I can give you a estimate on your project for free.
I have over 10 years experience in designing websites, apps, applying new design patterns & trends. And I am also taking care of usability aspects- user testing is a common tool for me to evaluate apps.
I went through dozens of projects and two startups in the last years, and learned a lot. Not only about technologies but also about promotion, people, monetisation, and market strategy. Plus: I am still excited about learning something new. Let me hear about your project!