Explore the practical application of the Eff monad in microservices architecture through this 49-minute conference talk from Scala Days Chicago 2017. Learn how to decompose a REST microservice into key components such as authentication, inter-service communication, and database access. Discover how the Eff monad can be utilized to define precise component interfaces and support additional functionalities like logging and asynchronous execution. Gain insights into implementing rate limiting as a separate component with time and state effects. Understand how this approach simplifies testing by eliminating the need for execution contexts and mocks. Bridge the gap between theoretical functional programming concepts and their real-world applications in everyday programming tasks.