Modern Java microservices in the Cloud
summary
Revolut describes a stack that aims for long‑lived simplicity: Java 17 with records, lightweight frameworks (historical use of Spark Java, now favoring Javalin/Helidon), constructor‑based injection and deliberate deprecation of DI frameworks, immutable value objects, and one client library per service. Migrations run at startup via Postgres + Flyway, tests use Testcontainers and explicit Jooq SQL, an event store atop Postgres NOTIFY exists, and services run on Kubernetes; these practices reduce surprise and have proven maintainable at scale.
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