Fibers get cut, databases crash, and you’ve adopted chaos engineering to challenge your production environment as much as possible. But what are you doing to craft the resiliency test suites that minimize the impact of failure on your application as much as possible? How do you debug resiliency problems locally and make sure single points of failure don’t creep into the application in the first place? Shopify developed the open source Toxiproxy in 2015 to emulate timeouts, latency, and outages in its development environments. This talk will equip you with tools to start writing resiliency test suites that harden your own applications and supplement other chaos engineering practices.