diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/CarDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/CarDataModel.cs
new file mode 100644
index 0000000..6ffb133
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/CarDataModel.cs
@@ -0,0 +1,35 @@
+using System.Text.RegularExpressions;
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class CarDataModel(string carId, string carMark, string carModel, string carNumber) : IValidation
+{
+    public string CarId { get; private set; } = carId;
+    public string CarMark { get; private set; } = carMark;
+    public string CarModel { get; private set; } = carModel;
+    public string CarNumber { get; private set; } = carNumber;
+
+    public void Validate()
+    {
+        if (CarId.IsEmpty())
+            throw new ValidationException("Field CarId is empty");
+
+        if (!CarId.IsGuid())
+            throw new ValidationException("The value in the field CarId is not a unique identifier");
+
+        if (CarMark.IsEmpty())
+            throw new ValidationException("Field CarMark is empty");
+
+        if (CarModel.IsEmpty())
+            throw new ValidationException("Field CarModel is empty");
+
+        if (CarNumber.IsEmpty())
+            throw new ValidationException("Field CarNumber is empty");
+
+        if (!Regex.IsMatch(CarNumber, @"^[АВЕКМНОРСТУХ]\d{3}(?<!000)[АВЕКМНОРСТУХ]{2}\d{2,3}$"))
+            throw new ValidationException("Field CarNumber is not a car number");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/OperationDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/OperationDataModel.cs
new file mode 100644
index 0000000..a8f85b8
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/OperationDataModel.cs
@@ -0,0 +1,25 @@
+using PimpMyRideContracts.Enums;
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class OperationDataModel(string operationId, OperationType operationType, List<OperationSupplieDataModel> supplies) : IValidation
+{
+    public string OperationId { get; private set; } = operationId;
+    public OperationType OperationType { get; private set; } = operationType;
+    public List<OperationSupplieDataModel> Supplies { get; private set; } = supplies;
+
+    public void Validate()
+    {
+        if (OperationId.IsEmpty())
+            throw new ValidationException("Field OperationId is empty");
+
+        if (!OperationId.IsGuid())
+            throw new ValidationException("The value in the field OperationId is not a unique identifier");
+
+        if ((Supplies?.Count ?? 0) == 0)
+            throw new ValidationException("The operation must include supplies");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/OperationSupplieDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/OperationSupplieDataModel.cs
new file mode 100644
index 0000000..bf3e0a4
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/OperationSupplieDataModel.cs
@@ -0,0 +1,30 @@
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class OperationSupplieDataModel(string operationId, string supplieId, int supplieCount) : IValidation
+{
+    public string OperationId { get; private set; } = operationId;
+    public string SupplieId { get; private set; } = supplieId;
+    public int SupplieCount { get; private set; } = supplieCount;
+
+    public void Validate()
+    {
+        if (OperationId.IsEmpty())
+            throw new ValidationException("Field OperationId is empty");
+
+        if (!OperationId.IsGuid())
+            throw new ValidationException("The value in the field OperationId is not a unique identifier");
+
+        if (SupplieId.IsEmpty())
+            throw new ValidationException("Field SupplieId is empty");
+
+        if (!SupplieId.IsGuid())
+            throw new ValidationException("The value in the field SupplieId is not a unique identifier");
+
+        if (SupplieCount <= 0)
+            throw new ValidationException("The value in field SupplieCount less ot equal 0");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/ServiceDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/ServiceDataModel.cs
new file mode 100644
index 0000000..d50939f
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/ServiceDataModel.cs
@@ -0,0 +1,37 @@
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class ServiceDataModel(string serviceId, string workerId, string carId, List<ServiceOperationDataModel> operations) : IValidation
+{
+    public string ServiceId { get; private set; } = serviceId;
+    public string WorkerId { get; private set; } = workerId;
+    public string CarId { get; private set; } = carId;
+    public List<ServiceOperationDataModel> Operations { get; private set; } = operations;
+
+    public void Validate()
+    {
+        if (ServiceId.IsEmpty())
+            throw new ValidationException("Field ServiceId is empty");
+
+        if (!ServiceId.IsGuid())
+            throw new ValidationException("The value in the field ServiceId is not a unique identifier");
+
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+
+        if (CarId.IsEmpty())
+            throw new ValidationException("Field CarId is empty");
+
+        if (!CarId.IsGuid())
+            throw new ValidationException("The value in the field CarId is not a unique identifier");
+
+        if ((Operations?.Count ?? 0) == 0)
+            throw new ValidationException("The service must include operations");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/ServiceOperationDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/ServiceOperationDataModel.cs
new file mode 100644
index 0000000..8180ebc
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/ServiceOperationDataModel.cs
@@ -0,0 +1,26 @@
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class ServiceOperationDataModel(string serviceId, string operationId) : IValidation
+{
+    public string ServiceId { get; private set; } = serviceId;
+    public string OperationId { get; private set; } = operationId;
+
+    public void Validate()
+    {
+        if(OperationId.IsEmpty())
+            throw new ValidationException("Field OperationId is empty");
+
+        if (!OperationId.IsGuid())
+            throw new ValidationException("The value in the field OperationId is not a unique identifier");
+
+        if(ServiceId.IsEmpty())
+            throw new ValidationException("Field ServiceId is empty");
+
+        if (!ServiceId.IsGuid())
+            throw new ValidationException("The value in the field ServiceId is not a unique identifier");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/SuppliesDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/SuppliesDataModel.cs
new file mode 100644
index 0000000..816f2df
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/SuppliesDataModel.cs
@@ -0,0 +1,28 @@
+using PimpMyRideContracts.Enums;
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class SuppliesDataModel(string supplieId, string supplieName, SuppliesType supplieType) : IValidation
+{
+    public string SupplieId { get; private set; } = supplieId;
+    public string SupplieName { get; private set; } = supplieName;
+    public SuppliesType SupplieType { get; private set; } = supplieType;
+
+    public void Validate()
+    {
+        if (SupplieId.IsEmpty())
+            throw new ValidationException("Field SupplieId is empty");
+
+        if (!SupplieId.IsGuid())
+            throw new ValidationException("The value in the field SupplieId is not a unique identifier");
+
+        if (SupplieName.IsEmpty())
+            throw new ValidationException("Field SupplieName is empty");
+
+        if (SupplieType == SuppliesType.None)
+            throw new ValidationException("Field SupplieType is empty");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/DataModels/WorkerDataModel.cs b/PimpMyRideProject/PimpMyRideContracts/DataModels/WorkerDataModel.cs
new file mode 100644
index 0000000..b9c1e7d
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/DataModels/WorkerDataModel.cs
@@ -0,0 +1,28 @@
+using PimpMyRideContracts.Enums;
+using PimpMyRideContracts.Exceptions;
+using PimpMyRideContracts.Extensions;
+using PimpMyRideContracts.Infrastructure;
+
+namespace PimpMyRideContracts.DataModels;
+
+public class WorkerDataModel(string workerId, string workerFIO, PostType postType) : IValidation
+{
+    public string WorkerId { get; private set; } = workerId;
+    public string WorkerFIO { get; private set; } = workerFIO;
+    public PostType PostType { get; private set; } = postType;
+
+    public void Validate()
+    {
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+
+        if (WorkerFIO.IsEmpty())
+            throw new ValidationException("Field WorkerFIO is empty");
+
+        if (PostType == PostType.None)
+            throw new ValidationException("Field PostType is empty");
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/Enums/OperationType.cs b/PimpMyRideProject/PimpMyRideContracts/Enums/OperationType.cs
new file mode 100644
index 0000000..0190837
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/Enums/OperationType.cs
@@ -0,0 +1,11 @@
+namespace PimpMyRideContracts.Enums;
+
+public enum OperationType
+{
+    None = 0,
+    TireReplacement = 1,
+    PistonReplacement = 2,
+    TimingBeltReplacing = 3,
+    OilChange = 4,
+    BodyPainting = 5
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/Enums/PostType.cs b/PimpMyRideProject/PimpMyRideContracts/Enums/PostType.cs
new file mode 100644
index 0000000..19dd68b
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/Enums/PostType.cs
@@ -0,0 +1,13 @@
+namespace PimpMyRideContracts.Enums;
+
+public enum PostType
+{
+    None = 0,
+    CarMechanic = 1,
+    CarElectrician = 2,
+    Straightener = 3,
+    BodyRepairSpecialist = 4,
+    TireFitter = 5,
+    CarDiagnosticTechnician = 6,
+    CarAirConditioningSpecialist = 7
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/Enums/SuppliesType.cs b/PimpMyRideProject/PimpMyRideContracts/Enums/SuppliesType.cs
new file mode 100644
index 0000000..fe53cdb
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/Enums/SuppliesType.cs
@@ -0,0 +1,13 @@
+namespace PimpMyRideContracts.Enums;
+
+public enum SuppliesType
+{
+    None = 0,
+    Suspension = 1,
+    Engine = 2,
+    Gearbox = 3,
+    Tires = 4,
+    Rims = 5,
+    Electronics = 6,
+    Body = 7
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/Exceptions/ValidationException.cs b/PimpMyRideProject/PimpMyRideContracts/Exceptions/ValidationException.cs
new file mode 100644
index 0000000..d3dc13c
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/Exceptions/ValidationException.cs
@@ -0,0 +1,5 @@
+namespace PimpMyRideContracts.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/Extensions/StringExtensions.cs b/PimpMyRideProject/PimpMyRideContracts/Extensions/StringExtensions.cs
new file mode 100644
index 0000000..9e24840
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/Extensions/StringExtensions.cs
@@ -0,0 +1,14 @@
+namespace PimpMyRideContracts.Extensions;
+
+public static class StringExtensions
+{
+    public static bool IsEmpty(this string str)
+    {
+        return string.IsNullOrWhiteSpace(str);
+    }
+
+    public static bool IsGuid(this string str)
+    {
+        return Guid.TryParse(str, out _);
+    }
+}
diff --git a/PimpMyRideProject/PimpMyRideContracts/Infrastructure/IValidation.cs b/PimpMyRideProject/PimpMyRideContracts/Infrastructure/IValidation.cs
new file mode 100644
index 0000000..4c17c6b
--- /dev/null
+++ b/PimpMyRideProject/PimpMyRideContracts/Infrastructure/IValidation.cs
@@ -0,0 +1,6 @@
+namespace PimpMyRideContracts.Infrastructure;
+
+public interface IValidation
+{
+    void Validate();
+}