Deliver in increments: discovery, design, foundation, identity/tenancy, core workflow, billing/async jobs, and production-readiness review.

How to apply it

Every milestone ends with a demo, tests, known risks, and a next-step decision. Include lint/type checks, logs, error handling, safe migrations, verified webhooks, and an operational runbook.

Worked example

A six-week plan can reserve early time for discovery/design, then identity and core workflow, followed by billing and hardening before staged rollout.

Common mistakes to avoid

Building all features in parallel without integration checkpoints.

Practice task

Implement this concept in the capstone. Add one positive test, one negative or failure-path test, and a short note explaining the trade-off you chose.