Szymon Fiedler

Make your JSON API tests clean with linter
Composable RSpec matchers
How to setup development work with RailsEventStore and mutant
Test critical paths in your app with ease thanks to Dependency Injection
One more step to DDD in a legacy rails app
The smart way to check health of a Rails app
How RSpec helped me with resolving random spec failures
A Simple feature toggle for a Rails app
Sitemaps with a bit of Metal
37 signals was not lying, you win by being remote