2020 marked the 25th anniversary of the Java programming language. One of the most widely used programming languages, Java is the server-side language for many back-end development projects. This session is intended for Java developers who like to optimize their applications for AWS Lambda and containers. We will discuss various tweaks and recommendations for each architecture to improve all phases of the development lifecycle – during build-, deploy-, and runtime. For this, we will revisit best practices from the past and look at new ones to reduce the cold start time, speed up execution, and improve monitoring. Before we finish the session, we will demonstrate how you can leverage GraalVM and Quarkus to optimize the application for AWS Lambda even further.