Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

ApplicationLayer/Services/Applicants/NeededServices/IApplicantsRepository.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains.ApplicantDomain;
+
+namespace ApplicationLayer.Services.Applicants.NeededServices;
+
+/// Repository pattern for <see cref="Applicant"/>
+public interface IApplicantsRepository : IGenericRepository<Applicant>
+{
+    /// Find <see cref="Applicant"/> by Identifier
+    Task<Applicant> FindByUserIdAsync(Guid userId, CancellationToken cancellationToken);
+
+    /// Get identifier of applicant by user identifier
+    Task<Guid> GetApplicantIdByUserId(Guid userId, CancellationToken cancellationToken);
+
+    /// Returns value of NonResident property of applicant
+    Task<bool> IsApplicantNonResidentByUserId(Guid userId, CancellationToken cancellationToken);
+}