Taming a Huge, Sprawling System with Clojure

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Early this year Russell and the team decided it was time to invest some serious effort into refactoring and rewriting these systems to make changes easier, safer, and faster. They also had to find a way to do this without compromising their ability to deliver new features. During this talk, you will discover the practices and architectural choices they found helpful, and the lessons learned along the way.

Things the talk will explore:

• System architecture

• Moving from a "distributed monolith" to a small set of well-factored, cohesive monoliths

• Isolating DB access to a single (multi-app) repository

• Defining interfaces between services using shared schema code

• Moving from horizontal to vertical slices

• Testing

• What are the purpose of tests when you have a REPL?

• Finding a middle-ground between example-based and property-based testing

• Using docker-compose to spin up instant, complete dev and test environments

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