How do I find an experienced mobile app development company?

For companies who want to hire a software development company, it is a hard task to select which company or what type of services to procure. There are many factors that contribute to the performance of the company as a top app development company. The company has to focus on some key points such as the technical expertise of the company, past performance, portfolio of the company, expertise in the relevant niche and timely delivery of projects.