incremental-implementation

Decompose multi-day features into independently deployable increments by applying vertical slicing—deliver end-to-end value in each small unit across UI, API, backend, and database layers. Each increment should be <500 lines, testable, and safe to deploy to main without blocking other work.

Vertical slicing prioritizes complete, thin cuts through all layers of your system rather than building one layer at a time. Each slice delivers measurable value and can deploy independently, reducing risk and enabling faster feedback cycles across your team.

Feature flags gate incomplete work behind toggles so code ships to main and production safely before the feature is user-visible. Plan the flag lifecycle upfront—when to enable, disable, and remove it—and pair it with clear rollout and backout strategies.

Define explicit dependencies between increments, establish clear success criteria for each unit, and plan backward-compatible migrations upfront. Document your backout strategy so each increment can be safely rolled back if needed.

Yes. Plan migrations as part of your increment strategy—deploy schema changes, backfill data, and toggle feature flags in separate, sequenced steps so each deployment is independently safe and reversible without downtime.

Each increment should be under 500 lines and independently deployable. Use the INVEST criteria—Independent, Negotiable, Valuable, Estimable, Small, and Testable—to ensure each unit delivers focused value and can be reviewed, tested, and deployed without dependencies on unreleased work.