diff --git a/src/Umbraco.Tests/Routing/RenderRouteHandlerTests.cs b/src/Umbraco.Tests/Routing/RenderRouteHandlerTests.cs
index d7b4b154eb..7552d4c0e7 100644
--- a/src/Umbraco.Tests/Routing/RenderRouteHandlerTests.cs
+++ b/src/Umbraco.Tests/Routing/RenderRouteHandlerTests.cs
@@ -56,8 +56,8 @@ namespace Umbraco.Tests.Routing
 
         public class TestRuntime : WebRuntime
         {
-            public TestRuntime(UmbracoApplicationBase umbracoApplication, Configs configs, IUmbracoVersion umbracoVersion, IIOHelper ioHelper, ILogger logger, IHostingEnvironment hostingEnvironment, IBackOfficeInfo backOfficeInfo)
-                : base(umbracoApplication, configs, umbracoVersion, ioHelper, Mock.Of<ILogger>(), Mock.Of<IProfiler>(), hostingEnvironment, backOfficeInfo, TestHelper.DbProviderFactoryCreator, TestHelper.MainDom)
+            public TestRuntime(Configs configs, IUmbracoVersion umbracoVersion, IIOHelper ioHelper, ILogger logger, IHostingEnvironment hostingEnvironment, IBackOfficeInfo backOfficeInfo)
+                : base(configs, umbracoVersion, ioHelper, Mock.Of<ILogger>(), Mock.Of<IProfiler>(), hostingEnvironment, backOfficeInfo, TestHelper.DbProviderFactoryCreator, TestHelper.MainDom)
             {
             }
 
diff --git a/src/Umbraco.Tests/Views/web.config b/src/Umbraco.Tests/Views/web.config
new file mode 100644
index 0000000000..efd80424e5
--- /dev/null
+++ b/src/Umbraco.Tests/Views/web.config
@@ -0,0 +1,74 @@
+<?xml version="1.0"?>
+
+<configuration>
+    <configSections>
+        <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
+            <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
+            <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
+        </sectionGroup>
+    </configSections>
+
+    <system.web.webPages.razor>
+        <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
+        <pages pageBaseType="System.Web.Mvc.WebViewPage">
+            <namespaces>
+                <add namespace="System.Web.Mvc" />
+                <add namespace="System.Web.Mvc.Ajax" />
+                <add namespace="System.Web.Mvc.Html" />
+                <add namespace="System.Web.Routing" />
+                <add namespace="Umbraco.Web" />
+                <add namespace="Umbraco.Core" />
+                <add namespace="Umbraco.Core.Models" />
+                <add namespace="Umbraco.Core.Models.PublishedContent" />
+                <add namespace="Umbraco.Web.Mvc" />
+                <add namespace="Examine" />
+                <add namespace="Umbraco.Web.PublishedModels" />
+            </namespaces>
+        </pages>
+    </system.web.webPages.razor>
+
+    <appSettings>
+        <add key="webpages:Enabled" value="false" />
+    </appSettings>
+
+    <system.webServer>
+        <handlers>
+            <remove name="BlockViewHandler"/>
+            <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
+        </handlers>
+    </system.webServer>
+
+    <system.web>
+        <compilation targetFramework="4.7.2">
+            <assemblies>
+                <add assembly="System.Web.Mvc, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
+
+                <!--
+                    Views are compiled by the Microsoft.CodeDom.Providers.DotNetCompilerPlatform which uses the Roslyn compiler
+                    from ~/bin/roslyn to expose an ICodeProvider implementation to System.CodeDom.
+
+                    For instance, starting with package 1.4.0 (which contains version 1.2.2.0) System.Collections.Immutable
+                    lists netstandard2.0 as a supported target, whereas package 1.3.1 only listed net45. So now, when
+                    installing, NuGet picks the netstandard2.0 version, thus introducing a dependency to netstandard2.0.
+                    
+                    Somehow, transitive dependencies are not working correctly, and either (a) NuGet fails to properly
+                    register this dependency, or (b) when reference assemblies are gathered before compiling views, this
+                    dependency is missed. In any case, the result is that the ICodeProvider is passed a list of referenced
+                    assemblies that is missing .NET Standard.
+
+                    It may be a mix of both. NuGet registers the dependency well enough, that we can actually build the
+                    whole application - but it is not doing something that is required in order to have .NET Standard
+                    being a dependency when building views.
+
+                    See also: https://stackoverflow.com/questions/50165910
+
+                    Funny enough, the CSharpCompiler already explicitly adds System.Runtime as a referenced assembly,
+                    with a comment mentioning an issue. But it's not adding .NET Standard. So, for the time being, to be sure,
+                    we are adding both here.
+                -->
+                <add assembly="System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
+                <add assembly="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" />                
+            </assemblies>
+        </compilation>
+    </system.web>
+</configuration>
diff --git a/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreBackOfficeInfo.cs b/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreBackOfficeInfo.cs
new file mode 100644
index 0000000000..ba12b64dfe
--- /dev/null
+++ b/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreBackOfficeInfo.cs
@@ -0,0 +1,16 @@
+using Umbraco.Core;
+using Umbraco.Core.Configuration;
+
+namespace Umbraco.Web.BackOffice.AspNetCore
+{
+    public class AspNetCoreBackOfficeInfo : IBackOfficeInfo
+    {
+        public AspNetCoreBackOfficeInfo(IGlobalSettings globalSettings)
+        {
+            GetAbsoluteUrl = globalSettings.UmbracoPath;
+        }
+
+        public string GetAbsoluteUrl { get; }
+
+    }
+}
diff --git a/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreMarchal.cs b/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreMarchal.cs
new file mode 100644
index 0000000000..98e040d338
--- /dev/null
+++ b/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreMarchal.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Runtime.InteropServices;
+using Umbraco.Core.Diagnostics;
+
+namespace Umbraco.Web.BackOffice
+{
+
+    public class AspNetCoreMarchal : IMarchal
+    {
+        // This thing is not available in net standard, but exists in both .Net 4 and .Net Core 3
+        public IntPtr GetExceptionPointers() => Marshal.GetExceptionPointers();
+    }
+}
diff --git a/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreSessionIdResolver.cs b/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreSessionIdResolver.cs
index abc043f9c5..5470516cf7 100644
--- a/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreSessionIdResolver.cs
+++ b/src/Umbraco.Web.BackOffice/AspNetCore/AspNetCoreSessionIdResolver.cs
@@ -3,11 +3,11 @@ using Umbraco.Net;
 
 namespace Umbraco.Web.BackOffice.AspNetCore
 {
-    internal class AspNetSessionIdResolver : ISessionIdResolver
+    internal class AspNetCoreSessionIdResolver : ISessionIdResolver
     {
         private readonly IHttpContextAccessor _httpContextAccessor;
 
-        public AspNetSessionIdResolver(IHttpContextAccessor httpContextAccessor)
+        public AspNetCoreSessionIdResolver(IHttpContextAccessor httpContextAccessor)
         {
             _httpContextAccessor = httpContextAccessor;
         }
diff --git a/src/Umbraco.Web.BackOffice/AspNetCore/UmbracoBackOfficeServiceCollectionExtensions.cs b/src/Umbraco.Web.BackOffice/AspNetCore/UmbracoBackOfficeServiceCollectionExtensions.cs
index 700398b9c1..8c7a798e95 100644
--- a/src/Umbraco.Web.BackOffice/AspNetCore/UmbracoBackOfficeServiceCollectionExtensions.cs
+++ b/src/Umbraco.Web.BackOffice/AspNetCore/UmbracoBackOfficeServiceCollectionExtensions.cs
@@ -1,4 +1,12 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DependencyInjection;
+using Umbraco.Core;
+using Umbraco.Core.Cache;
+using Umbraco.Core.Configuration;
+using Umbraco.Core.IO;
+using Umbraco.Core.Logging;
+using Umbraco.Core.Logging.Serilog;
 
 namespace Umbraco.Web.BackOffice.AspNetCore
 {
@@ -6,8 +14,37 @@ namespace Umbraco.Web.BackOffice.AspNetCore
     {
         public static IServiceCollection AddUmbracoBackOffice(this IServiceCollection services)
         {
+
+
+            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
+
+            CreateCompositionRoot(services);
+
+
             return services;
         }
 
+        private static void CreateCompositionRoot(IServiceCollection services)
+        {
+            var serviceProvider = services.BuildServiceProvider();
+
+            var httpContextAccessor = serviceProvider.GetService<IHttpContextAccessor>();
+            var webHostEnvironment = serviceProvider.GetService<IWebHostEnvironment>();
+
+            var configFactory = new ConfigsFactory();
+
+            var hostingSettings = configFactory.HostingSettings;
+            var coreDebug = configFactory.CoreDebug;
+
+            var hostingEnvironment = new AspNetCoreHostingEnvironment(hostingSettings, webHostEnvironment);
+            var ioHelper = new IOHelper(hostingEnvironment);
+            var configs = configFactory.Create(ioHelper);
+
+            var logger = SerilogLogger.CreateWithDefaultConfiguration(hostingEnvironment,  new AspNetCoreSessionIdResolver(httpContextAccessor), () => services.BuildServiceProvider().GetService<IRequestCache>(), coreDebug, ioHelper, new AspNetCoreMarchal());
+            var backOfficeInfo = new AspNetCoreBackOfficeInfo(configs.Global());
+            var profiler = new LogProfiler(logger);
+
+            Composing.Current.Initialize(logger, configs, ioHelper, hostingEnvironment, backOfficeInfo, profiler);
+        }
     }
 }
diff --git a/src/Umbraco.Web.BackOffice/Umbraco.Web.BackOffice.csproj b/src/Umbraco.Web.BackOffice/Umbraco.Web.BackOffice.csproj
index 4a9a3bb6d2..ca260b12f5 100644
--- a/src/Umbraco.Web.BackOffice/Umbraco.Web.BackOffice.csproj
+++ b/src/Umbraco.Web.BackOffice/Umbraco.Web.BackOffice.csproj
@@ -11,6 +11,7 @@
 
     <ItemGroup>
       <ProjectReference Include="..\Umbraco.Abstractions\Umbraco.Abstractions.csproj" />
+      <ProjectReference Include="..\Umbraco.Configuration\Umbraco.Configuration.csproj" />
       <ProjectReference Include="..\Umbraco.Core\Umbraco.Core.csproj" />
       <ProjectReference Include="..\Umbraco.Infrastructure\Umbraco.Infrastructure.csproj" />
     </ItemGroup>
diff --git a/src/Umbraco.Web/Runtime/WebRuntime.cs b/src/Umbraco.Web/Runtime/WebRuntime.cs
index 0fc35af2f2..9c8337c2e4 100644
--- a/src/Umbraco.Web/Runtime/WebRuntime.cs
+++ b/src/Umbraco.Web/Runtime/WebRuntime.cs
@@ -22,15 +22,12 @@ namespace Umbraco.Web.Runtime
     /// <remarks>On top of CoreRuntime, handles all of the web-related runtime aspects of Umbraco.</remarks>
     public class WebRuntime : CoreRuntime
     {
-        private readonly UmbracoApplicationBase _umbracoApplication;
         private BuildManagerTypeFinder _typeFinder;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="WebRuntime"/> class.
         /// </summary>
-        /// <param name="umbracoApplication"></param>
         public WebRuntime(
-            UmbracoApplicationBase umbracoApplication,
             Configs configs,
             IUmbracoVersion umbracoVersion,
             IIOHelper ioHelper,
@@ -42,7 +39,6 @@ namespace Umbraco.Web.Runtime
             IMainDom mainDom):
             base(configs, umbracoVersion, ioHelper, logger, profiler ,new AspNetUmbracoBootPermissionChecker(), hostingEnvironment, backOfficeInfo, dbProviderFactoryCreator, mainDom)
         {
-            _umbracoApplication = umbracoApplication;
 
             Profiler = GetWebProfiler();
         }
diff --git a/src/Umbraco.Web/UmbracoApplication.cs b/src/Umbraco.Web/UmbracoApplication.cs
index 90d575bf73..34b0ae5412 100644
--- a/src/Umbraco.Web/UmbracoApplication.cs
+++ b/src/Umbraco.Web/UmbracoApplication.cs
@@ -34,7 +34,7 @@ namespace Umbraco.Web
 
             var mainDom = new MainDom(logger, hostingEnvironment, mainDomLock);
 
-            return new WebRuntime(this, configs, umbracoVersion, ioHelper, logger, profiler, hostingEnvironment, backOfficeInfo, dbProviderFactoryCreator, mainDom);
+            return new WebRuntime(configs, umbracoVersion, ioHelper, logger, profiler, hostingEnvironment, backOfficeInfo, dbProviderFactoryCreator, mainDom);
         }
 
         /// <summary>