Shift-Left

Shift-Right

Validating quality in production — through monitoring, feature flags, canary releases, and chaos experiments — to catch issues that synthetic tests can't reproduce.

TDD (Test-Driven Development)

Write a failing test first, write the minimum code to make it pass, refactor. Drives design through tests rather than testing afterward — and produces a thorough unit test suite as a byproduct.

Continuous Integration

The practice of merging code changes to a shared branch frequently, with automated builds and tests running on every change. Catches integration issues early and keeps the main branch always shippable.