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Forty services in one monorepo. How do you decide what to build and test for a single change?

Build graphs identify affected targets only when their dependencies are complete. The ladder from build-everything to content-addressed caching, hermeticity audits, and where undeclared inputs rot correctness.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Build graphs identify affected targets only when their dependencies are complete. The ladder from build-everything to content-addressed caching, hermeticity audits, and where undeclared inputs rot correctness.

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