Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

Infrastructure/Database/Applicants/Repositories/ApplicantsRepository.cs

@@ -0,0 +1,39 @@
+using ApplicationLayer.Services.Applicants.NeededServices;
+using Domains.ApplicantDomain;
+using Infrastructure.Database.Applicants.Repositories.Exceptions;
+using Infrastructure.Database.Generic;
+using Microsoft.EntityFrameworkCore;
+
+namespace Infrastructure.Database.Applicants.Repositories;
+
+/// Repository pattern for <see cref="Applicant"/>
+/// <param name="reader"><inheritdoc cref="IGenericReader"/></param>
+/// <param name="writer"><inheritdoc cref="IGenericWriter"/></param>
+public sealed class ApplicantsRepository(IGenericReader reader, IGenericWriter writer)
+    : GenericRepository<Applicant>(reader, writer), IApplicantsRepository
+{
+    protected override IQueryable<Applicant> LoadDomain()
+    {
+        return base.LoadDomain()
+            .Include(a => a.PlaceOfWork);
+    }
+
+    /// <inheritdoc cref="IApplicantsRepository.FindByUserIdAsync"/>
+    public async Task<Applicant> FindByUserIdAsync(Guid userId, CancellationToken cancellationToken)
+    {
+        var result = await LoadDomain().SingleOrDefaultAsync(a => a.UserId == userId, cancellationToken);
+        return result ?? throw new ApplicantNotFoundByUserIdException();
+    }
+
+    async Task<Guid> IApplicantsRepository.GetApplicantIdByUserId(Guid userId, CancellationToken cancellationToken)
+    {
+        var result = await base.LoadDomain().SingleOrDefaultAsync(a => a.UserId == userId, cancellationToken);
+        return result?.Id ?? throw new ApplicantNotFoundByUserIdException();
+    }
+
+    async Task<bool> IApplicantsRepository.IsApplicantNonResidentByUserId(Guid userId, CancellationToken cancellationToken)
+    {
+        var applicant = await FindByUserIdAsync(userId, cancellationToken);
+        return applicant.IsNonResident;
+    }
+}

Infrastructure/Database/Applicants/Repositories/Exceptions/ApplicantNotFoundByUserIdException.cs

@@ -0,0 +1,5 @@
+using ApplicationLayer.GeneralExceptions;
+
+namespace Infrastructure.Database.Applicants.Repositories.Exceptions;
+
+public class ApplicantNotFoundByUserIdException() : EntityNotFoundException("Applicant not found.");