diff --git a/backend/Platform.LabMetadata.Tests/LaboratoryTests.cs b/backend/Platform.LabMetadata.Tests/LaboratoryTests.cs
new file mode 100644
index 0000000..b51bf44
--- /dev/null
+++ b/backend/Platform.LabMetadata.Tests/LaboratoryTests.cs
@@ -0,0 +1,118 @@
+
+using System;
+using NUnit.Framework;
+using Platform.LabMetadata;
+
+namespace Platform.LabMetadata.Tests
+{
+    [TestFixture]
+    public class LaboratoryMetadataTests
+    {
+        [Test]
+        public void Constructor_ShouldPreserveLaboratoryId()
+        {
+            var id = Guid.NewGuid();
+
+            var metadata = new LaboratoryMetadata(
+                id,
+                "Learn access control",
+                LaboratoryDifficulty.Easy,
+                LaboratoryType.AccessControl,
+                new[] { "security" }
+            );
+
+            Assert.That(metadata.LaboratoryId, Is.EqualTo(id));
+        }
+
+        [Test]
+        public void Constructor_ShouldRejectInvalidDifficulty()
+        {
+            var invalidDifficulty = (LaboratoryDifficulty)999;
+
+            Assert.Throws<ArgumentOutOfRangeException>(() =>
+                new LaboratoryMetadata(
+                    Guid.NewGuid(),
+                    "Test objective",
+                    invalidDifficulty,
+                    LaboratoryType.AccessControl,
+                    new[] { "security" }
+                )
+            );
+        }
+
+        [Test]
+        public void Constructor_ShouldRejectInvalidType()
+        {
+            var invalidType = (LaboratoryType)999;
+
+            Assert.Throws<ArgumentOutOfRangeException>(() =>
+                new LaboratoryMetadata(
+                    Guid.NewGuid(),
+                    "Test objective",
+                    LaboratoryDifficulty.Easy,
+                    invalidType,
+                    new[] { "security" }
+                )
+            );
+        }
+
+        [Test]
+        public void Constructor_ShouldNormalizeTags()
+        {
+            var metadata = new LaboratoryMetadata(
+                Guid.NewGuid(),
+                "Test objective",
+                LaboratoryDifficulty.Easy,
+                LaboratoryType.AccessControl,
+                new[] { " Security ", "MFA", "security", " " }
+            );
+
+            Assert.That(
+                metadata.Tags,
+                Is.EqualTo(new[] { "security", "mfa" })
+            );
+        }
+
+        [Test]
+        public void Constructor_ShouldRejectEmptyId()
+        {
+            Assert.Throws<ArgumentException>(() =>
+                new LaboratoryMetadata(
+                    Guid.Empty,
+                    "Test objective",
+                    LaboratoryDifficulty.Easy,
+                    LaboratoryType.AccessControl,
+                    new[] { "security" }
+                )
+            );
+        }
+
+        [Test]
+        public void Constructor_ShouldRejectEmptyObjective()
+        {
+            Assert.Throws<ArgumentException>(() =>
+                new LaboratoryMetadata(
+                    Guid.NewGuid(),
+                    " ",
+                    LaboratoryDifficulty.Easy,
+                    LaboratoryType.AccessControl,
+                    new[] { "security" }
+                )
+            );
+        }
+
+        [Test]
+        public void Constructor_ShouldRejectNullTags()
+        {
+            Assert.Throws<ArgumentNullException>(() =>
+                new LaboratoryMetadata(
+                    Guid.NewGuid(),
+                    "Test objective",
+                    LaboratoryDifficulty.Easy,
+                    LaboratoryType.AccessControl,
+                    null!
+                )
+            );
+        }
+    }
+}
diff --git a/backend/Platform.LabMetadata.Tests/Platform.LabMetadata.Tests.csproj b/backend/Platform.LabMetadata.Tests/Platform.LabMetadata.Tests.csproj
new file mode 100644
index 0000000..1d565f9
--- /dev/null
+++ b/backend/Platform.LabMetadata.Tests/Platform.LabMetadata.Tests.csproj
@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
+    <PackageReference Include="NUnit" Version="4.3.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.7.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Platform.LabMetadata\Platform.LabMetadata.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+</Project>
diff --git a/backend/Platform.LabMetadata/LaboratoryDifficulty.cs b/backend/Platform.LabMetadata/LaboratoryDifficulty.cs
new file mode 100644
index 0000000..6f41dbc
--- /dev/null
+++ b/backend/Platform.LabMetadata/LaboratoryDifficulty.cs
@@ -0,0 +1,10 @@
+
+namespace Platform.LabMetadata
+{
+    public enum LaboratoryDifficulty
+    {
+        Easy,
+        Medium,
+        Hard
+    }
+}
diff --git a/backend/Platform.LabMetadata/LaboratoryMetadata.cs b/backend/Platform.LabMetadata/LaboratoryMetadata.cs
new file mode 100644
index 0000000..25f6894
--- /dev/null
+++ b/backend/Platform.LabMetadata/LaboratoryMetadata.cs
@@ -0,0 +1,59 @@
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Platform.LabMetadata
+{
+    public class LaboratoryMetadata
+    {
+        // Referenca na postojecu laboratoriju iz LAB-01.
+        // LAB-02 ne generise novi identitet.
+        public Guid LaboratoryId { get; }
+
+        public string Objective { get; private set; }
+        public LaboratoryDifficulty Difficulty { get; private set; }
+        public LaboratoryType Type { get; private set; }
+        public IReadOnlyList<string> Tags { get; private set; }
+
+        public LaboratoryMetadata(
+            Guid laboratoryId,
+            string objective,
+            LaboratoryDifficulty difficulty,
+            LaboratoryType type,
+            IEnumerable<string> tags)
+        {
+            if (laboratoryId == Guid.Empty)
+                throw new ArgumentException(
+                    "Laboratory ID cannot be empty.",
+                    nameof(laboratoryId));
+
+            if (string.IsNullOrWhiteSpace(objective))
+                throw new ArgumentException(
+                    "Laboratory objective is required.",
+                    nameof(objective));
+
+            if (!Enum.IsDefined(difficulty))
+                throw new ArgumentOutOfRangeException(nameof(difficulty));
+
+            if (!Enum.IsDefined(type))
+                throw new ArgumentOutOfRangeException(nameof(type));
+
+            if (tags is null)
+                throw new ArgumentNullException(nameof(tags));
+
+            LaboratoryId = laboratoryId;
+            Objective = objective.Trim();
+            Difficulty = difficulty;
+            Type = type;
+
+            Tags = Array.AsReadOnly(
+                tags
+                    .Where(tag => !string.IsNullOrWhiteSpace(tag))
+                    .Select(tag => tag.Trim().ToLowerInvariant())
+                    .Distinct()
+                    .ToArray()
+            );
+        }
+    }
+}
diff --git a/backend/Platform.LabMetadata/LaboratoryType.cs b/backend/Platform.LabMetadata/LaboratoryType.cs
new file mode 100644
index 0000000..01d31c0
--- /dev/null
+++ b/backend/Platform.LabMetadata/LaboratoryType.cs
@@ -0,0 +1,15 @@
+
+namespace Platform.LabMetadata
+{
+    public enum LaboratoryType
+    {
+        AccessControl,
+        LogAnalysis,
+        SecurityConfiguration,
+        ThreatModeling,
+        MfaAndSessions,
+        ContextualAuthorization,
+        IncidentResponse,
+        IsolatedService
+    }
+}
diff --git a/backend/Platform.LabMetadata/Platform.LabMetadata.csproj b/backend/Platform.LabMetadata/Platform.LabMetadata.csproj
new file mode 100644
index 0000000..b760144
--- /dev/null
+++ b/backend/Platform.LabMetadata/Platform.LabMetadata.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/backend/SecurityLab.slnx b/backend/SecurityLab.slnx
index 2f30a35..1302954 100644
--- a/backend/SecurityLab.slnx
+++ b/backend/SecurityLab.slnx
@@ -4,6 +4,8 @@
   <Project Path="Platform.Api/Platform.Api.csproj" />
   <Project Path="Platform.Audit/Platform.Audit.csproj" />
   <Project Path="Platform.Audit.Tests/Platform.Audit.Tests.csproj" />
+  <Project Path="Platform.LabMetadata.Tests/Platform.LabMetadata.Tests.csproj" Id="8ff98d14-96bd-4c62-b1ce-8e45e60fb816" />
+  <Project Path="Platform.LabMetadata/Platform.LabMetadata.csproj" Id="90892a49-5843-4415-a14a-1d89b684646f" />
   <Project Path="Platform.Authoring.Tests/Platform.Authoring.Tests.csproj" />
   <Project Path="Platform.Authoring/Platform.Authoring.csproj" />
   <Project Path="Platform.RateLimiting.Tests/Platform.RateLimiting.Tests.csproj" />