Java / Quarkus Interview questions
What is the difference between Quarkus and Micronaut?
Quarkus and Micronaut share a similar high-level goal — fast-starting, low-memory Java microservices with native-image support — and both avoid runtime reflection-heavy bootstrap, but they differ in ecosystem backing, standards alignment, and some implementation details.
| Quarkus | Micronaut |
| Backed by Red Hat; strong alignment with Jakarta EE/MicroProfile standards. | Backed by the Micronaut Foundation (originated at OCI/Grails team); its own conventions. |
| Dependency resolution via ArC, a purpose-built CDI implementation. | Uses compile-time annotation processing for its own DI model, not standard CDI. |
| Large extension catalog closely tracking familiar Jakarta EE APIs. | Broad support for AOP, serverless, and microservice-specific features out of the box. |
| Popular where standards compliance (JAX-RS, JPA, CDI) is valued. | Popular for greenfield reactive/serverless projects favoring Micronaut's own idioms. |
In practice, both perform similarly on raw startup/memory benchmarks; the more common deciding factor in interviews and real projects is whether a team values close alignment to established Jakarta EE standards (favoring Quarkus) or is fine adopting Micronaut's own framework-specific conventions in exchange for its particular feature set.
What DI mechanism does Micronaut use instead of standard CDI?
What is a common reason teams choose Quarkus over Micronaut?
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