diff --git a/agenta-backend/agenta_backend/services/aggregation_service.py b/agenta-backend/agenta_backend/services/aggregation_service.py
new file mode 100644
index 0000000000..d657bdf4de
--- /dev/null
+++ b/agenta-backend/agenta_backend/services/aggregation_service.py
@@ -0,0 +1,75 @@
+import re
+import traceback
+from typing import List
+
+from agenta_backend.models.db_models import Result, Error
+
+
+def aggregate_ai_critique(results: List[Result]) -> Result:
+    """Aggregates the results for the ai critique evaluation.
+
+    Args:
+        results (List[Result]): list of result objects
+
+    Returns:
+        Result: aggregated result
+    """
+
+    numeric_scores = []
+    for result in results:
+        # Extract the first number found in the result value
+        match = re.search(r"\d+", result.value)
+        if match:
+            try:
+                score = int(match.group())
+                numeric_scores.append(score)
+            except ValueError:
+                # Ignore if the extracted value is not an integer
+                continue
+
+    # Calculate the average of numeric scores if any are present
+    average_value = (
+        sum(numeric_scores) / len(numeric_scores) if numeric_scores else None
+    )
+    return Result(
+        type="number",
+        value=average_value,
+    )
+
+
+def aggregate_binary(results: List[Result]) -> Result:
+    """Aggregates the results for the binary (auto regex) evaluation.
+
+    Args:
+        results (List[Result]): list of result objects
+
+    Returns:
+        Result: aggregated result
+    """
+
+    if all(isinstance(result.value, bool) for result in results):
+        average_value = sum(int(result.value) for result in results) / len(results)
+    else:
+        average_value = None
+    return Result(type="number", value=average_value)
+
+
+def aggregate_float(results: List[Result]) -> Result:
+    """Aggregates the results for evaluations aside from auto regex and ai critique.
+
+    Args:
+        results (List[Result]): list of result objects
+
+    Returns:
+        Result: aggregated result
+    """
+
+    try:
+        average_value = sum(result.value for result in results) / len(results)
+        return Result(type="number", value=average_value)
+    except Exception as exc:
+        return Result(
+            type="error",
+            value=None,
+            error=Error(message=str(exc), stacktrace=str(traceback.format_exc())),
+        )
diff --git a/agenta-backend/agenta_backend/tasks/evaluations.py b/agenta-backend/agenta_backend/tasks/evaluations.py
index 0c387ac236..cfe05d06e3 100644
--- a/agenta-backend/agenta_backend/tasks/evaluations.py
+++ b/agenta-backend/agenta_backend/tasks/evaluations.py
@@ -23,6 +23,7 @@
     evaluators_service,
     llm_apps_service,
     deployment_manager,
+    aggregation_service,
 )
 from agenta_backend.services.db_manager import (
     create_new_evaluation_scenario,
@@ -312,45 +313,25 @@ async def aggregate_evaluator_results(
 
         if not results:
             result = Result(type="error", value=None, error=Error(message="-"))
-        else:
-            if evaluator_key == "auto_ai_critique":
-                numeric_scores = []
-                for result in results:
-                    # Extract the first number found in the result value
-                    match = re.search(r"\d+", result.value)
-                    if match:
-                        try:
-                            score = int(match.group())
-                            numeric_scores.append(score)
-                        except ValueError:
-                            # Ignore if the extracted value is not an integer
-                            continue
-
-                # Calculate the average of numeric scores if any are present
-                average_value = (
-                    sum(numeric_scores) / len(numeric_scores)
-                    if numeric_scores
-                    else None
-                )
-                result = Result(
-                    type="number",
-                    value=average_value,
-                )
+            continue
 
-            else:
-                # Handle boolean values for auto_regex_test and other evaluators
-                if all(isinstance(result.value, bool) for result in results):
-                    average_value = sum(result.value for result in results) / len(
-                        results
-                    )
-                else:
-                    # Handle other data types or mixed results
-                    average_value = None
+        if evaluator_key == "auto_ai_critique":
+            result = aggregation_service.aggregate_ai_critique(results)
 
-                result = Result(
-                    type="number",
-                    value=average_value,
-                )
+        elif evaluator_key == "auto_regex_test":
+            result = aggregation_service.aggregate_binary(results)
+
+        elif evaluator_key in [
+            "auto_exact_match",
+            "auto_similarity_match",
+            "field_match_test",
+            "auto_webhook_test",
+            "auto_custom_code_run",
+        ]:
+            result = aggregation_service.aggregate_float(results)
+
+        else:
+            raise Exception(f"Evaluator {evaluator_key} aggregation does not exist")
 
         evaluator_config = await fetch_evaluator_config(config_id)
         aggregated_result = AggregatedResult(