Imidazo[1,2-b]pyridazine-based compounds of the formula (I): are disclosed, wherein R1, R2 and R3 are defined herein. Compositions comprising the compounds and methods of their use to treat, manage and/or prevent diseases and disorders mediated by mediated by adaptor associated kinase 1 activity are also disclosed. An example of the compound is (S)-1-(2-(((3-(3-chlorophenyl)imidazo[1,2-b] pyridazin-6-yl)amino)methyl)pyrrolidin-1-yl)-3-methylbutan-1-one.