diff --git a/docs/migration/v4.md b/docs/migration/v4.md
index a63f834..64aaebc 100644
--- a/docs/migration/v4.md
+++ b/docs/migration/v4.md
@@ -27,4 +27,13 @@ The `AddNCronJob(Delegate)` (Minimal API) was a different static class than the
 ```diff
 - IServiceCollection.AddNCronJob(() => {}, "* * * * *");
 + NCronJobExtensions.AddNCronJob(services, () => {}, "* * * * *");
-```
\ No newline at end of file
+```
+
+## `IRuntimeRegistry` is more restrictive
+In `v3` the `IRuntimeRegistry` offered the ability to use the whole `NCronJobOptionBuilder` which lead to confusion, especially if done something like this:
+
+```csharp
+runtimeRegistry.AddJob(n => n.AddJob<MyJob>(...).RunAtStartup().AddExceptionHandler<MyHandler>());
+```
+
+It didn't make sense to add a startup job during runtime. Also adding exception handlers during runtime was out of scope for this feature. Therefore the interface is more restrictive now and only allows to add jobs.
\ No newline at end of file
diff --git a/src/NCronJob/Configuration/Builder/IRuntimeJobBuilder.cs b/src/NCronJob/Configuration/Builder/IRuntimeJobBuilder.cs
new file mode 100644
index 0000000..8a7f540
--- /dev/null
+++ b/src/NCronJob/Configuration/Builder/IRuntimeJobBuilder.cs
@@ -0,0 +1,37 @@
+namespace NCronJob;
+
+/// <summary>
+/// Represents a builder for adding jobs at runtime.
+/// </summary>
+public interface IRuntimeJobBuilder
+{
+    /// <summary>
+    /// Adds a job to the service collection that gets executed based on the given cron expression.
+    /// </summary>
+    /// <param name="options">Configures the <see cref="JobOptionBuilder"/>, like the cron expression or parameters that get passed down.</param>
+    /// <returns>Returns the <see cref="IRuntimeJobBuilder"/> for chaining.</returns>
+    IRuntimeJobBuilder AddJob<TJob>(Action<JobOptionBuilder>? options = null) where TJob : class, IJob;
+
+    /// <summary>
+    /// Adds a job to the service collection that gets executed based on the given cron expression.
+    /// </summary>
+    /// <param name="jobType">The type of the job to be added.</param>
+    /// <param name="options">Configures the <see cref="JobOptionBuilder"/>, like the cron expression or parameters that get passed down.</param>
+    /// <returns>Returns the <see cref="IRuntimeJobBuilder"/> for chaining.</returns>
+    IRuntimeJobBuilder AddJob(Type jobType, Action<JobOptionBuilder>? options = null);
+
+    /// <summary>
+    /// Adds a job using an asynchronous anonymous delegate to the service collection that gets executed based on the given cron expression.
+    /// </summary>
+    /// <param name="jobDelegate">The delegate that represents the job to be executed.</param>
+    /// <param name="cronExpression">The cron expression that defines when the job should be executed.</param>
+    /// <param name="timeZoneInfo">The time zone information that the cron expression should be evaluated against.
+    /// If not set the default time zone is UTC.
+    /// </param>
+    /// <param name="jobName">Sets the job name that can be used to identify and manipulate the job later on.</param>
+    /// <returns>Returns the <see cref="IRuntimeJobBuilder"/> for chaining.</returns>
+    IRuntimeJobBuilder AddJob(Delegate jobDelegate,
+        string cronExpression,
+        TimeZoneInfo? timeZoneInfo = null,
+        string? jobName = null);
+}
diff --git a/src/NCronJob/Configuration/Builder/NCronJobOptionBuilder.cs b/src/NCronJob/Configuration/Builder/NCronJobOptionBuilder.cs
index 97254b0..9a7640f 100644
--- a/src/NCronJob/Configuration/Builder/NCronJobOptionBuilder.cs
+++ b/src/NCronJob/Configuration/Builder/NCronJobOptionBuilder.cs
@@ -8,10 +8,10 @@ namespace NCronJob;
 /// <summary>
 /// Represents the builder for the NCronJob options.
 /// </summary>
-public class NCronJobOptionBuilder : IJobStage
+public class NCronJobOptionBuilder : IJobStage, IRuntimeJobBuilder
 {
-    private protected readonly IServiceCollection Services;
-    private protected readonly ConcurrencySettings Settings;
+    private readonly IServiceCollection services;
+    private readonly ConcurrencySettings settings;
     private readonly JobRegistry jobRegistry;
 
     internal NCronJobOptionBuilder(
@@ -19,8 +19,8 @@ internal NCronJobOptionBuilder(
         ConcurrencySettings settings,
         JobRegistry jobRegistry)
     {
-        Services = services;
-        Settings = settings;
+        this.services = services;
+        this.settings = settings;
         this.jobRegistry = jobRegistry;
     }
 
@@ -41,7 +41,7 @@ public IStartupStage<T> AddJob<T>(Action<JobOptionBuilder>? options = null)
         where T : class, IJob
     {
         var builder = AddJobInternal(typeof(T), options);
-        return new StartupStage<T>(Services, Settings, jobRegistry, builder);
+        return new StartupStage<T>(services, settings, jobRegistry, builder);
     }
 
     /// <summary>
@@ -60,7 +60,7 @@ public IStartupStage<T> AddJob<T>(Action<JobOptionBuilder>? options = null)
     public IStartupStage<IJob> AddJob(Type jobType, Action<JobOptionBuilder>? options = null)
     {
         var builder = AddJobInternal(jobType, options);
-        return new StartupStage<IJob>(Services, Settings, jobRegistry, builder);
+        return new StartupStage<IJob>(services, settings, jobRegistry, builder);
     }
 
     /// <summary>
@@ -103,10 +103,25 @@ public NCronJobOptionBuilder AddJob(
     /// </remarks>
     public NCronJobOptionBuilder AddExceptionHandler<TExceptionHandler>() where TExceptionHandler : class, IExceptionHandler
     {
-        Services.AddSingleton<IExceptionHandler, TExceptionHandler>();
+        services.AddSingleton<IExceptionHandler, TExceptionHandler>();
         return this;
     }
 
+    IRuntimeJobBuilder IRuntimeJobBuilder.AddJob<TJob>(Action<JobOptionBuilder>? options)
+    {
+        AddJob<TJob>(options);
+        return this;
+    }
+
+    IRuntimeJobBuilder IRuntimeJobBuilder.AddJob(Type jobType, Action<JobOptionBuilder>? options)
+    {
+        AddJob(jobType, options);
+        return this;
+    }
+
+    IRuntimeJobBuilder IRuntimeJobBuilder.AddJob(Delegate jobDelegate, string cronExpression, TimeZoneInfo? timeZoneInfo, string? jobName) =>
+        AddJob(jobDelegate, cronExpression, timeZoneInfo, jobName);
+
     private void ValidateConcurrencySetting(object jobIdentifier)
     {
         var cachedJobAttributes = jobIdentifier switch
@@ -117,11 +132,11 @@ private void ValidateConcurrencySetting(object jobIdentifier)
         };
 
         var concurrencyAttribute = cachedJobAttributes.ConcurrencyPolicy;
-        if (concurrencyAttribute != null && concurrencyAttribute.MaxDegreeOfParallelism > Settings.MaxDegreeOfParallelism)
+        if (concurrencyAttribute != null && concurrencyAttribute.MaxDegreeOfParallelism > settings.MaxDegreeOfParallelism)
         {
             var name = jobIdentifier is Type type ? type.Name : ((MethodInfo)jobIdentifier).Name;
             throw new InvalidOperationException(
-                $"The MaxDegreeOfParallelism for {name} ({concurrencyAttribute.MaxDegreeOfParallelism}) cannot exceed the global limit ({Settings.MaxDegreeOfParallelism}).");
+                $"The MaxDegreeOfParallelism for {name} ({concurrencyAttribute.MaxDegreeOfParallelism}) cannot exceed the global limit ({settings.MaxDegreeOfParallelism}).");
         }
     }
 
@@ -143,7 +158,7 @@ private JobOptionBuilder AddJobInternal(Type jobType, Action<JobOptionBuilder>?
         var builder = new JobOptionBuilder();
         options?.Invoke(builder);
 
-        Services.TryAddScoped(jobType);
+        services.TryAddScoped(jobType);
 
         var jobOptions = builder.GetJobOptions();
 
diff --git a/src/NCronJob/Registry/RuntimeJobRegistry.cs b/src/NCronJob/Registry/RuntimeJobRegistry.cs
index 5a47312..e46615b 100644
--- a/src/NCronJob/Registry/RuntimeJobRegistry.cs
+++ b/src/NCronJob/Registry/RuntimeJobRegistry.cs
@@ -11,7 +11,7 @@ public interface IRuntimeJobRegistry
     /// <summary>
     /// Gives the ability to add a job.
     /// </summary>
-    void AddJob(Action<NCronJobOptionBuilder> jobBuilder);
+    void AddJob(Action<IRuntimeJobBuilder> jobBuilder);
 
     /// <summary>
     /// Removes the job with the given name.
@@ -121,7 +121,7 @@ public RuntimeJobRegistry(
     }
 
     /// <inheritdoc />
-    public void AddJob(Action<NCronJobOptionBuilder> jobBuilder)
+    public void AddJob(Action<IRuntimeJobBuilder> jobBuilder)
     {
         var builder = new NCronJobOptionBuilder(services, concurrencySettings, jobRegistry);
         jobBuilder(builder);