diff --git a/doc/architecture.md b/doc/architecture.md
deleted file mode 100644
index c44c96e..0000000
--- a/doc/architecture.md
+++ /dev/null
@@ -1,11 +0,0 @@
-```mermaid
-classDiagram
-    DevopsBuild <|-- DevopsDockerBuild
-    DevopsBuild <|-- DevopsTerraformBuild
-
-    DevopsBuild <|-- C4kMixin
-
-    DevopsBuild *-- BuildService
-    DevopsDockerBuild *-- DockerBuildService
-    C4kMixin *-- C4kBuildService
-```
\ No newline at end of file
diff --git a/doc/architecture/Build.md b/doc/architecture/Build.md
new file mode 100644
index 0000000..9ef0024
--- /dev/null
+++ b/doc/architecture/Build.md
@@ -0,0 +1,110 @@
+# Build Frontend
+
+```mermaid
+classDiagram
+    class DevopsBuild {
+        name()
+        build_path()
+        initialize_build_dir()
+    }
+
+    class DevopsTerraformBuild {
+        terraform_build_commons_path()
+        project_vars()
+        copy_build_resource_file_from_package(name)
+        copy_build_resources_from_package()
+        copy_build_resources_from_dir()
+        copy_local_state()
+        rescue_local_state()
+        initialize_build_dir()
+        post_build()
+        init_client()
+        write_output(terraform)
+        read_output_json()
+        plan()
+        plan_fail_on_diff()
+        apply(auto_approve=False)
+        refresh()
+        destroy(auto_approve=False)
+        tf_import(tf_import_name, tf_import_resource,)
+        print_terraform_command(terraform)
+    }
+
+    class HetznerMixin {
+        // HetznerMixin -> HetznerTerraformBuild
+        project_vars()
+        copy_build_resources_from_package()
+    }
+
+    class ExoscaleMixin {
+        // ExoscaleMixin -> ExoscaleTerraformBuild
+        project_vars()
+        copy_build_resources_from_package()
+    }
+
+    class AwsBackendPropertiesMixin {
+        def project_vars()
+        copy_build_resources_from_package()
+        init_client()
+    }
+
+    class DigitaloceanBackendPropertiesMixin {
+        project_vars(self)
+        copy_build_resources_from_package(self)
+        init_client(self)
+    }
+
+    class DevopsDockerBuild {
+        def initialize_build_dir()
+        image()
+        drun()
+        dockerhub_login()
+        dockerhub_publish()
+        test()
+    }
+
+    class ProvsK3sMixin {
+        // ProvsK3sMixin -> ProvsK3sBuild
+        def update_runtime_config(fqdn, ipv4, ipv6=None)
+        write_provs_config()
+        provs_apply(dry_run=False)
+    }
+
+    class C4kMixin {
+        // C4kMixin -> C4kBuild
+        def write_c4k_config()
+        def write_c4k_auth()
+        c4k_apply(dry_run=False)
+    }
+
+    DevopsBuild <|-- DevopsDockerBuild
+    DevopsBuild <|-- DevopsTerraformBuild
+    DevopsBuild <|-- AwsRdsPgMixin
+
+    DevopsTerraformBuild <|-- AwsBackendPropertiesMixin
+    DevopsTerraformBuild <|-- DigitaloceanTerraformBuild
+    DevopsTerraformBuild <|--ExoscaleMixin
+    DevopsTerraformBuild <|--HetznerMixin
+    DevopsBuild <|-- ProvsK3sMixin
+    DigitaloceanTerraformBuild <|-- DigitaloceanBackendPropertiesMixin
+    AwsBackendPropertiesMixin <|-- AwsMfaMixin
+
+    DevopsBuild <|-- C4kMixin
+
+```
+
+# Build Frontend with application and domain
+
+```mermaid
+classDiagram
+    DevopsBuild <|-- DevopsDockerBuild
+    DevopsBuild <|-- DevopsTerraformBuild
+
+    DevopsBuild <|-- C4kMixin
+
+    DevopsBuild *-- BuildService
+    DevopsDockerBuild *-- DockerBuildService
+    C4kMixin *-- C4kBuildService
+```
+
+# Domain
\ No newline at end of file
diff --git a/doc/architecture/BuildCreationAndCall.md b/doc/architecture/BuildCreationAndCall.md
new file mode 100644
index 0000000..3c46bde
--- /dev/null
+++ b/doc/architecture/BuildCreationAndCall.md
@@ -0,0 +1,54 @@
+# Build Frontend with application and domain
+
+```mermaid
+classDiagram
+    class DevopsBuild {
+        __init__(project, config)
+        do_sth(project)
+    }
+
+    class ProjectRepository {
+        get_build(project): Build
+        set_build(project, build)
+    }
+
+    class Build
+
+    class BuildService {
+        do_sth(project, build)
+    }
+
+    DevopsBuild *-- BuildService
+    BuildService *-- ProjectRepository
+    DevopsBuild *-- ProjectRepository
+    
+```
+
+In case of simple operations we will not need the BuildService in between.
+
+
+## Init Sequence
+
+```mermaid
+sequenceDiagram
+    MyBuild ->> DevOpsBuild: create_config
+    MyBuild ->> DevOpsBuild: __init__(project, config)
+    activate DevOpsBuild
+    DevOpsBuild ->> Build: __init__
+    DevOpsBuild ->> ProjectRepository: set_build(build)
+    deactivate DevOpsBuild
+```
+
+## do_sth Sequence
+
+```mermaid
+sequenceDiagram
+    MyBuild ->> DevOpsBuild: do_sth(project)
+    activate DevOpsBuild
+    DevOpsBuild ->> BuildService: do_sth(project)
+    activate BuildService
+    BuildService ->> ProjectRepository: get_build
+    BuildService ->> BuildService: do_some_complicated_stuff(build)
+    deactivate BuildService
+    deactivate DevOpsBuild
+```
\ No newline at end of file
diff --git a/doc/architecture/Domain.md b/doc/architecture/Domain.md
new file mode 100644
index 0000000..133940d
--- /dev/null
+++ b/doc/architecture/Domain.md
@@ -0,0 +1,10 @@
+# Domain
+
+```mermaid
+classDiagram
+    class Build {
+        __init__(project, config)
+        do_sth(project)
+    }
+    
+```
\ No newline at end of file