Christopher Rose focused on stabilizing the per-item validation flow for the ministryofjustice/laa-submit-crime-forms repository, addressing a crash that occurred when item_type was missing during user submissions. He delivered a targeted Ruby on Rails backend fix that gated not_a_number errors on the presence of item_type, preserving the integrity of item-aware validation for both primary service costs and alternative quote details. To ensure ongoing reliability, Christopher implemented regression tests covering shared and alternative quote validation paths. His approach minimized production risk by limiting the scope of changes, maintaining user-facing validation messages, and verifying stability through manual testing and automated coverage.