diff --git a/backend/src/main/java/org/raddatz/familienarchiv/search/NlQueryInterpretation.java b/backend/src/main/java/org/raddatz/familienarchiv/search/NlQueryInterpretation.java
new file mode 100644
index 00000000..5313f093
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/search/NlQueryInterpretation.java
@@ -0,0 +1,22 @@
+package org.raddatz.familienarchiv.search;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import java.time.LocalDate;
+import java.util.List;
+
+public record NlQueryInterpretation(
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        List<PersonHint> resolvedPersons,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        List<PersonHint> ambiguousPersons,
+        LocalDate dateFrom,
+        LocalDate dateTo,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        List<String> keywords,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        String rawQuery,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        boolean keywordsApplied
+) {
+}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/search/NlSearchRequest.java b/backend/src/main/java/org/raddatz/familienarchiv/search/NlSearchRequest.java
new file mode 100644
index 00000000..0e9d3a9a
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/search/NlSearchRequest.java
@@ -0,0 +1,11 @@
+package org.raddatz.familienarchiv.search;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public record NlSearchRequest(
+        @NotBlank
+        @Size(min = 3, max = 500)
+        String query
+) {
+}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/search/NlSearchResponse.java b/backend/src/main/java/org/raddatz/familienarchiv/search/NlSearchResponse.java
new file mode 100644
index 00000000..04e51bff
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/search/NlSearchResponse.java
@@ -0,0 +1,12 @@
+package org.raddatz.familienarchiv.search;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import org.raddatz.familienarchiv.document.DocumentSearchResult;
+
+public record NlSearchResponse(
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        DocumentSearchResult result,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        NlQueryInterpretation interpretation
+) {
+}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/search/OllamaClient.java b/backend/src/main/java/org/raddatz/familienarchiv/search/OllamaClient.java
new file mode 100644
index 00000000..c0c8f1da
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/search/OllamaClient.java
@@ -0,0 +1,5 @@
+package org.raddatz.familienarchiv.search;
+
+public interface OllamaClient {
+    NlQueryInterpretation parse(String query);
+}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/search/OllamaHealthClient.java b/backend/src/main/java/org/raddatz/familienarchiv/search/OllamaHealthClient.java
new file mode 100644
index 00000000..9f1ad1d5
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/search/OllamaHealthClient.java
@@ -0,0 +1,5 @@
+package org.raddatz.familienarchiv.search;
+
+public interface OllamaHealthClient {
+    boolean isHealthy();
+}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/search/PersonHint.java b/backend/src/main/java/org/raddatz/familienarchiv/search/PersonHint.java
new file mode 100644
index 00000000..61a0e0b9
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/search/PersonHint.java
@@ -0,0 +1,13 @@
+package org.raddatz.familienarchiv.search;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import java.util.UUID;
+
+public record PersonHint(
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        UUID id,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        String displayName
+) {
+}