When the client approached us, they already had two working websites generating traffic, one in English and the other in Portuguese. Their goal was to switch from their current stack to SPA to improve the websites’ usability. The client’s team realized the challenge of such migration: if done incorrectly, possible outcomes were traffic loss, pessimization, and, as a result, client loss. They asked for our help in migrating to SPA to save the existing traffic and avoid negative implications.