I have something similar: Kotlin on the server-side with my SQL DSL generated by jOOQ and Flyway running my schema migrations. I don't have any experience with LINQ--but it looks to be of a similar idea to jOOQ such that you get an autogenerated, injection-safe, type-safe, compile-time-checked SQL DSL.
If you like LINQ, you'd probably really like jOOQ. It's uber-powerful and the only queries that I've not been able to completely write in jOOQ are geo-spatial queries--and even for them, I can use string SQL for just the one where-clause predicate where I need to go off-the-rails--the rest of the query still being standard jOOQ. The thing I like most about it, is that the queries that I write in the DSL are sooo close-to-the-metal of pure SQL--I'm not even context-switching between SQL and jOOQ really. Check it out!