Over the last four years, Squarespace’s product offerings have expanded significantly. To keep up with Squarespace's growing platform, we needed to scale our functional test coverage. We created Firepit, a user interface (UI) for configuring and triggering tests. Firepit empowers engineers to easily run custom test suites in Squarespace's deployment environments. The foundation of our testing philosophy is straightforward: write tests that are simple, readable, and stable.