Jam City is the company making Harry Potter: Hogwarts Mystery.
They are a Los Angeles-based mobile game maker created in 2010 by former MySpace co-founders Chris DeWolfe, Aber Whitcomb, and former 20th Century Fox executive Josh Yguado,
Jam City is the creator of 6 of the Top 100 highest grossing games across Apple’s and Google’s US app stores. Its portfolio of titles includes Cookie Jam, Panda Pop, Family Guy: The Quest for Stuff and Marvel Avengers Academy. These have been downloaded more than 800 million times and is regularly played by nearly 50 million people monthly.
Jam City has studios in Seattle, San Francisco, San Diego and Buenos Aires. In 2016, Jam City acquired TinyCo, a San Francisco studio at the forefront of bringing the world’s most popular entertainment franchises to mobile games.
Check out their websit at http://www.jamcity.com/