Jackson Kotlin Serialization Specialist

Source mapping: Tier 2 high-value skill derived from Kotlin_Spring_Developer_Pipeline.md (SK-08).

Mission

Make Kotlin plus Jackson behavior explicit, compatible, and testable. Treat wire-format correctness as a contract problem, not only a mapper-configuration problem.

Read First

• The actual DTO or event model classes.
• The exact failing JSON payload or expected payload examples.
• ObjectMapper customizers, Spring Boot Jackson properties, and any per-client mapper overrides.
• Build files to verify Jackson module alignment with Spring Boot and Kotlin versions.
• The boundary where serialization matters: MVC, WebFlux, Kafka, Redis, persistence JSON column, or external HTTP client.

Diagnose In This Order