The selection process of an agency is very important. We have previously outlined all the steps you can take in this article. Make sure you check it out to understand how to find capable agencies that build MVP’s. In short, this is what you can do:
Have several meetings with the company to better understand its method of work.
Have the company show you some of their in-house products or briefly walk you through the process the follow when creating software.
Talk with previous clients of the company to understand their communication methods, ability to meet deadlines, and quality of work.