Worked on the companieshouse/psc-data-api repository to enhance null-safety in PSC identity verification features using Java. Focused on backend development and code refactoring, the work introduced @Nullable annotations to PscIdentityVerificationDetails and refactored CompanyPscTransformer to leverage Optional for date fields, simplifying null handling and reducing the risk of null-dereference errors. Unused helpers and imports were removed to streamline the codebase, improving maintainability and clarity for future contributors. These changes established a cleaner foundation for ongoing development, demonstrating disciplined application of Java best practices and supporting more reliable data processing within the PSC data API’s backend infrastructure.