sbt — Scala Build Tool

Why it matters

sbt is Scala's Maven. Understanding shapes daily developer experience.

The architecture

build.sbt: project settings as Scala DSL.

plugins.sbt: build plugins.

How it works end to end

Cross-building: same code for multiple Scala versions.

Multi-project builds: monorepo support.

Repl: sbt console for interactive REPL.

Alternatives: Mill (simpler), Bazel (large-scale).