Developer's glossary

CORS — cross-origin request rules. JWT — signed claims token. SSR/CSR — server/client rendering. Webhook — event callback. Idempotency — safe repeat.

ACID — transaction guarantees. Index — read speed at write cost. N+1 — query antipattern. Migration — versioned schema change. ORM — object DB access.

Monolith/microservices — deployment boundaries. Event-driven — coupling via events. CQRS — read/write split. Circuit breaker — cascade-failure guard. SLA/SLO/SLI — service levels.

CI/CD — automated build and delivery. Blue-green — two environments for zero downtime. Canary — release to a traffic slice. Observability — logs+metrics+traces. Runbook — incident playbook.

Rebase — moving commits to a new base. Cherry-pick — selective commit. Trunk-based — short branches into main. Semantic commit — feat/fix/chore. HEAD~ — previous commit.

Unit — isolated test. Integration — module wiring. E2E — user scenario. Mock/stub — fake dependencies. Coverage — test code coverage (a metric, not a goal).