Modern applications are composed of increasing numbers of microservices which talk to each other using APIs. They are also increasingly composed of heterogeneous components such as managed databases, message queues, data warehouses, third party APIs, and so on. This has made it all the more important to provide developers with rich feedback and signals from environments that resemble production - or better yet, are built off of production itself. Test signals from environments of lower fidelity are typically not as useful and it is more expensive to maintain multiple high fidelity environments in close synchronization.

The solution is to enable testing safely in production. In this session, you will learn how DoorDash, with 1500+ engineers doing 100s of commits per day on 200+ microservices, built a scalable system using open-source components like Kubernetes, Envoy, OpenTelemetry, improving developer velocity by testing in production in a safe and secure manner.

The talk assumes that you know Kubernetes and microservice fundamentals, along with concepts like context propagation, OpenTelemetry and Service Mesh.