This tutorial is targeted at researchers and practitioners interested in building efficient domain specific languages (DSLs) and program generators. Lightweight Modular Staging (LMS) is a pragmatic approach to runtime code generation in Scala, and Delite is a compiler framework for embedded DSLs that simplifies the process of implementing DSLs for parallel computation and heterogeneous targets. This tutorial provides an overview of the technology stack, demonstrates use-­cases where it has been successfully applied and guides the attendees step-­by-­step through creation of simple generators and DSLs.