diff --git a/src/domain/card-repository.ts b/src/domain/card-repository.ts
new file mode 100644
index 0000000..0020cbd
--- /dev/null
+++ b/src/domain/card-repository.ts
@@ -0,0 +1,12 @@
+import type { Card, CardInput } from './card'
+
+export interface CardRepository {
+  findAll(): Promise<Card[]>
+  findById(id: string): Promise<Card | null>
+  create(input: CardInput): Promise<Card>
+  update(id: string, input: Partial<CardInput>): Promise<Card | null>
+  delete(id: string): Promise<boolean>
+  findRandom(): Promise<Card | null>
+  findRandomByTheme(theme: string): Promise<Card | null>
+  findThemes(): Promise<string[]>
+}
\ No newline at end of file