End-to-End Launch Hardening

Now that we've covered Stripe Checkout for Subscriptions and Plan Limits and Usage Quotas, the website checker has the shape of a paid SaaS app.

Users can:

• register and log in
• start website audits
• review spellcheck reports
• manage false positives
• upgrade through Stripe
• hit plan limits when usage is too high

The final startup-engineer step is launch hardening.

Hardening means checking the full path a real customer will take and removing fragile assumptions before traffic arrives:

visitor signs up
   ↓
starts audit
   ↓
sees report
   ↓
hits limit
   ↓
upgrades
   ↓
webhook updates subscription
   ↓
starts more audits

This is not a new feature sprint. It is the discipline of making the features you already built behave reliably together.