Worked on enhancing the robustness of FHIR path evaluation in the FirelyTeam/firely-net-sdk repository by addressing nullability handling within the FhirPath ElementResolver. Focused on backend development using C# and .NET, the work introduced support for nullable ITypedElement returns, allowing the resolver to gracefully manage scenarios where resources are missing. This technical approach reduced runtime errors and improved the stability of FHIRPath evaluation, directly benefiting downstream integrations that rely on these rules. The update strengthened the reliability of API development workflows involving FHIR, demonstrating a careful, detail-oriented approach to improving library resilience and lowering support overhead for users.