Concepts

Most integration pain doesn't come from code - it comes from the shape of your interfaces. Learn to design boundaries that clarify failure modes instead of hiding them.

Operations that are safe to repeat converge to the same state. This simple property changes everything about how you design, deploy, and recover.

Not all work creates equal outcomes. Learn to identify where small changes create disproportionate impact - and where effort vanishes without leverage.

Systems without feedback are guessing machines. Design loops that surface reality fast enough to matter, before assumptions drift too far from truth.

Most complexity isn't in the code - it's in the coordination between people, teams, and components. Recognize it, name it, and design around it.

Interfaces are promises. Contract tests lock those promises, catch breakage before production, and give consumers confidence to integrate.