Migrating an Old App to a Modern Codebase
Apps built years ago often reach a point where they are costly to maintain, slow to change, or at risk of breaking on new devices. Migrating to a modern codebase renews the foundation without throwing away what works.
It is a significant decision, and the right approach depends on the state of the existing app and your future plans.
When an App Grows Old
Software ages in ways that are not always visible from the outside. An app may still run today yet sit on tools and frameworks that are no longer supported, making every change slower, riskier and more expensive. Left long enough, it can stop working on new devices altogether. Recognising when an app has reached this point is the first step in deciding whether to migrate.
Signs It Is Time
- Small changes take far longer and cost more than they should.
- The app relies on outdated, unsupported technology.
- It struggles or crashes on the latest devices.
- Adding modern features is difficult or impossible.
How We Approach a Migration
- Assess the existing app and document what it does.
- Decide between a phased rebuild and a clean rewrite.
- Preserve user data and core behaviour throughout.
- Release carefully so existing users are not disrupted.
Frequently Asked Questions
Will users have to do anything?
Ideally not. A good migration is invisible to users — they simply receive an update, with their data and login intact.
Is migrating cheaper than starting over?
Often, yes, because we reuse proven logic and design. We advise honestly when a fresh start would actually serve you better.
If you need a hand with any of this, your Progressive Robot delivery team is ready to help. Raise a ticket from the Support area of your client portal or speak to your account manager and we will guide you through the next steps.