Flutter project (involves Keycloak integratin with PKCE Auth Code Flow, Data forms)

The project will grow into an open-source project which provides all the target platforms (web, desktop, and mobile). It's going to be a long-term project, but a small portion of it needs to be built immediately, mainly the integration with keycloak for login and a few data form pages). I need to know the current state of performance issues that existed with Flutter web with previous releases. More details could be discussed in chat. A person who's willing to collaborate long-term with an open-source mindset, but with adequate compensation is perfect. The budget mentioned is for the development of an MVP.