Filmin
Angular to React, in production
Replaced in flight.
Filmin's TV app was Angular, coupled to an older project, carrying years of special cases. It became fully React without a release freeze — the app kept shipping while the framework changed underneath it.
The problem
A rewrite nobody can pause for
The safe way to change frameworks is to stop everything else and do only that. A streaming service can't: features, device certifications and fixes keep their own calendar. The migration had to happen inside the normal release rhythm, or not at all.
The codebase made it harder — Angular coupled to an older project, and a special case for every television that disagreed with the rest.
The approach
Sequence over speed
Decouple first, so the app stood on its own. Then move it piece by piece, with both frameworks running in the same build until the last Angular view was gone. Consolidating the platform special cases as each piece crossed over meant the React side started cleaner than the Angular side had ever been.
The result
One hundred percent, quietly
Angular is retired. One React codebase ships to every device at once, and the effort that used to go into keeping two worlds alive goes into the product instead.