diff --git a/adapter/di/__init__.py b/adapter/di/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/adapter/di/container.py b/adapter/di/container.py
new file mode 100644
index 0000000..b1efdbe
--- /dev/null
+++ b/adapter/di/container.py
@@ -0,0 +1,67 @@
+from collections.abc import Mapping
+from dataclasses import dataclass, field
+from pathlib import Path
+
+from adapter.config.loader import load_config
+from adapter.config.model import AppConfig
+from adapter.otel.bootstrap import OtelRuntime, setup_otel
+from repository.user import InMemoryUserRepository
+from usecase.user import GetUser
+
+
+@dataclass(frozen=True, slots=True)
+class AppRepositories:
+    user: InMemoryUserRepository
+
+
+@dataclass(frozen=True, slots=True)
+class AppUsecases:
+    get_user: GetUser
+
+
+@dataclass(slots=True)
+class AppContainer:
+    config: AppConfig
+    observability: OtelRuntime
+    repositories: AppRepositories
+    usecases: AppUsecases
+    _is_shutdown: bool = field(default=False, init=False, repr=False)
+
+    def shutdown(self) -> None:
+        if self._is_shutdown:
+            return
+
+        try:
+            self.observability.shutdown()
+        finally:
+            self._is_shutdown = True
+
+
+def build_container(
+    config_path: Path | str | None = None,
+    env_path: Path | str | None = None,
+    environ: Mapping[str, str] | None = None,
+) -> AppContainer:
+    config = load_config(
+        config_path=config_path,
+        env_path=env_path,
+        environ=environ,
+    )
+    observability = setup_otel(config)
+
+    user_repository = InMemoryUserRepository()
+    repositories = AppRepositories(user=user_repository)
+    usecases = AppUsecases(
+        get_user=GetUser(
+            repository=user_repository,
+            logger=observability.logger,
+            tracer=observability.tracer,
+        )
+    )
+
+    return AppContainer(
+        config=config,
+        observability=observability,
+        repositories=repositories,
+        usecases=usecases,
+    )