When writing more powerful abstractions with Kotlin it becomes necessary to have a strong grasp of how to use generics. This talk covers a variety of concepts surrounding generic types & type parameters. Key points: * variance (covariance, contravariance, invariance) * type projection (+star projection, aka wildcard) * type constraints * reification (with inline modifier) Bree has 14 years experience doing full stack engineering in a variety of industries—from creative marketing agencies (Gin Lane), to music discovery (Hype Machine), underground events (Speakeasy), to group fitness (ClassPass), a desire to leverage the right tool for the job is the thread that ties all her work together.