diff --git a/interfaces/auth/microsoft_entra_interface.dart b/interfaces/auth/microsoft_entra_interface.dart
new file mode 100644
index 0000000..e0a30e0
--- /dev/null
+++ b/interfaces/auth/microsoft_entra_interface.dart
@@ -0,0 +1,105 @@
+import 'package:aad_oauth/aad_oauth.dart';
+import 'package:aad_oauth/model/config.dart';
+import 'package:arcane_framework/arcane_framework.dart';
+import 'package:flutter/material.dart';
+
+class MicrosoftEntraInterface implements ArcaneAuthInterface {
+  MicrosoftEntraInterface._internal();
+  static final ArcaneAuthInterface _instance =
+      MicrosoftEntraInterface._internal();
+  static ArcaneAuthInterface get I => _instance;
+
+  static bool _mocked = false;
+
+  AadOAuth? _oauth;
+
+  @override
+  Future<String?>? get refreshToken async {
+    if (!await isSignedIn) return null;
+
+    final result = await _oauth?.refreshToken();
+
+    if (result == null) return null;
+
+    return result.fold(
+      (l) => null,
+      (r) async => r.refreshToken,
+    );
+  }
+
+  @override
+  Future<String?> get accessToken async =>
+      _oauth?.getAccessToken() ?? Future.value(null);
+
+  @override
+  Future<bool> get isSignedIn async =>
+      _oauth?.hasCachedAccountInformation ?? Future.value(false);
+
+  @override
+  Future<void> init() async {
+    if (_mocked) return;
+    if (_oauth != null) return;
+
+    final String? tenant = AppEnv.valueOf(EnvVar.adSsoTenant);
+    final String? clientId = AppEnv.valueOf(EnvVar.adSsoClientId);
+    final String? scope = AppEnv.valueOf(EnvVar.adSsoScope);
+    final String? redirectUri = AppEnv.valueOf(EnvVar.adSsoRedirectUri);
+
+    if (tenant == null) throw const FormatException('Tenant must not be null.');
+    if (clientId == null)
+      throw const FormatException('Client ID must not be null.');
+    if (scope == null) throw const FormatException('Scope must not be null.');
+    if (redirectUri == null)
+      throw const FormatException('Redirect URI must not be null.');
+
+    final Config config = Config(
+      tenant: tenant,
+      clientId: clientId,
+      scope: scope,
+      redirectUri: redirectUri,
+      navigatorKey:
+          navigatorKey, // Should be a GlobalKey<NavigatorState>() in the app's router
+    );
+
+    _oauth = AadOAuth(config);
+  }
+
+  @override
+  Future<Result<void, String>> login<T>(
+      {T? input, Future<void> Function()? onLoggedIn}) async {
+    if (_mocked) return Result.ok(null);
+    if (_oauth == null) await init();
+
+    if (await isSignedIn) return Result.ok(null);
+
+    final result = await _oauth!.login();
+
+    return result.fold(
+      (l) {
+        print(l);
+        return Result.error('Microsoft Authentication Failed!');
+      },
+      (r) async {
+        if (onLoggedIn != null) await onLoggedIn();
+        return Result.ok(null);
+      },
+    );
+  }
+
+  @override
+  Future<Result<void, String>> logout() async {
+    if (_mocked) return Result.ok(null);
+    if (_oauth == null) await init();
+
+    if (!await isSignedIn) return Result.error('Not signed in');
+
+    await _oauth?.logout();
+
+    return Result.ok(null);
+  }
+
+  @visibleForTesting
+  static void setMocked() {
+    _mocked = true;
+  }
+}
diff --git a/interfaces/logging/dev_log_interface.dart b/interfaces/logging/dev_log_interface.dart
new file mode 100644
index 0000000..9d9b066
--- /dev/null
+++ b/interfaces/logging/dev_log_interface.dart
@@ -0,0 +1,43 @@
+import 'dart:developer' as dev;
+
+import 'package:arcane_framework/arcane_framework.dart';
+import 'package:arcane_helper_utils/arcane_helper_utils.dart';
+import 'package:flutter/foundation.dart';
+
+class DevLog implements LoggingInterface {
+  static final DevLog _instance = DevLog._internal();
+  static DevLog get I => _instance;
+
+  final bool _initialized = true;
+
+  @override
+  bool get initialized => I._initialized;
+
+  DevLog._internal();
+
+  @visibleForTesting
+  void setMocked() => _mocked = true;
+  bool _mocked = false;
+
+  @override
+  void log(
+    String message, {
+    Map<String, dynamic>? metadata,
+    Level? level,
+    StackTrace? stackTrace,
+    Object? extra,
+  }) {
+    // If the string is too long, the message won't print. This _shouldn't_ be
+    // the case with `log`, yet here we are.
+    for (final String part in message.splitByLength(256)) {
+      dev.log(part);
+    }
+  }
+
+  @override
+  Future<LoggingInterface?> init() async {
+    if (_mocked) return null;
+
+    return I;
+  }
+}