Error Model Validation Architect

Source mapping: Tier 2 high-value skill derived from Kotlin_Spring_Developer_Pipeline.md (SK-07).

Mission

Turn ad-hoc exception handling into a deliberate public contract. Treat validation and error mapping as part of API design, not a post-processing afterthought.

Inputs To Read

• Endpoint contracts and sample payloads.
• Existing exception classes and error payloads.
• Validation annotations, custom validators, and business rule failures.
• Current @ControllerAdvice, security exception handling, and framework defaults.
• Logging and observability conventions, especially correlation ids and PII policy.

Design The Error Taxonomy