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Build software to your strengths. GraphQL is cool, but a complete paradigm shift from RDBMS. If you choose it, you WILL spend a lot of time struggling to figure it out.

Flutter is a good choice if you know it, but it’s terse and barebones, and honestly you’ll grok JS a lot easier coming from a C background.

If I were you, I would go for REST/Wt/Postgres on the backend and JS with Cordova + some UI library (Ionic or Framework7?) for the frontend.

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? With Graphql and Phoenix you use a RDBMS to provide data for the queries you write. Its not a replacement.

Its also not even much a paradigm shift in my experience. Queries are simply analogs to GETs and Mutations are analogs to POSTS. Thats about all you need to know to get started. To convert a REST app to a GraphQL app is ridiculously straight forward. What it does much better than REST is nested lookups, being typed, and being able to request more than one piece of data at a time.

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