The Rebuild: preserve the product, replace the limits

The Rebuild is the exception

Most apps can be improved without being rebuilt. The Scan most often concludes with a targeted Production Upgrade, not a rebuild. Rebuilding becomes relevant only when the limitations are structural and comparative cost supports the decision.

The three signals that justify rebuilding

1. The architecture blocks what's next. Your app does what it does, but every new feature breaks two things elsewhere. The generated code piled up without an overall plan, and the cost of each evolution climbs instead of falling.
2. Security needs redoing everywhere. When flaws are not isolated points to fix but a repeated pattern across the whole codebase, closing them one by one costs more than starting from healthy foundations.
3. The platform holds your project back. Quotas, impossible features, costs that explode with usage: when your backend lives at Base44 or within the limits of a Replit plan, there comes a point where pure migration isn't enough and the app deserves a real architecture of its own.

What we keep from your prototype

The prototype is not a draft to throw away. It is a living specification. It validated the need, the flows, the screens, the features that actually matter. The Rebuild starts from there:

• Your features, taken over one by one, as your users know them
• Your data and your accounts, migrated without loss
• Your interface, kept or improved, your call
• What you learned, built in instead of rediscovered at your expense

What we rebuild on

On KERN-IT's engineering stack: the one we use for our own products and for our clients for over ten years. Clear architecture, automated tests, reproducible deployment, monitoring, backups. Nothing exotic: proven, documented foundations another developer can pick up tomorrow. Your app becomes software like the ones we ship as an agency, with the same standards.

A project track, not an endless construction site

The Rebuild is split into delivered stages: first the foundation (data, accounts, security), then the features in order of importance, with a usable version at every stage. You see the progress, you pay per stage, and the old app keeps running until the new one is ready. The budget is scoped after the Scan, like the Intervention, and we explain the ranges in our article on costs.