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Bun is a modern JavaScript/TypeScript runtime built from scratch in Zig, designed to be a fast, all-in-one replacement for Node.js. It includes a package manager (bun install), bundler (bun build), and test runner (bun test) natively, reducing tooling complexity. Job relevance: Backend and full-stack developers increasingly adopt Bun for performance-critical applications, edge computing, and rapid API development. Expertise attracts startups and performance-focused teams.