diff --git a/data_pipeline/stages/assemble_validated_events.py b/data_pipeline/stages/assemble_validated_events.py
index 5dbc055..5dc48f7 100644
--- a/data_pipeline/stages/assemble_validated_events.py
+++ b/data_pipeline/stages/assemble_validated_events.py
@@ -217,11 +217,14 @@ def error(msg):
     for table_name in EVENT_TABLES:
 
         df = load_logical_table(
-            contracted_path, table_name, log_info=info, log_error=error
+            contracted_path,
+            table_name,
+            log_info=info,
+            log_error=error,
         )
 
         if df is None:
-            log_error(f"{table_name}: dataset is empty", report)
+            error(f"{table_name}: dataset is empty")
             report["status"] = "failed"
 
             return report
@@ -234,7 +237,7 @@ def error(msg):
         df_contract = freeze_schema(df_assembled)
 
     except Exception as e:
-        log_error(str(e), report)
+        error(str(e))
         report["status"] = "failed"
 
         return report
@@ -242,9 +245,10 @@ def error(msg):
     output_path = run_context.assembled_path / "assembled_events.parquet"
 
     if not export_file(df_contract, output_path):
-        log_error("Export failed", report)
+        error("Export failed")
         report["status"] = "failed"
 
+    info(f"Export success: assembled_events.parquet ({len(df_contract)} rows)")
     return report
 
 
diff --git a/data_pipeline/stages/build_bi_semantic_layer.py b/data_pipeline/stages/build_bi_semantic_layer.py
index 1b1cfe7..267ff92 100644
--- a/data_pipeline/stages/build_bi_semantic_layer.py
+++ b/data_pipeline/stages/build_bi_semantic_layer.py
@@ -5,6 +5,87 @@
 # - Define and lock analytical grains for consistent aggregation and reporting
 # - Enforce referential integrity between fact and dimension tables
 
+import pandas as pd
+from typing import Dict, List
+from data_pipeline.shared.run_context import RunContext
+from data_pipeline.shared.raw_loader_exporter import load_logical_table, export_file
+
+
+# ------------------------------------------------------------
+# SEMANTIC REPORT & LOGS
+# ------------------------------------------------------------
+
+
+def init_report():
+    return {"status": "success", "errors": [], "info": []}
+
+
+def log_info(message: str, report: Dict[str, List[str]]) -> None:
+    print(f"[INFO] {message}")
+    report["info"].append(message)
+
+
+def log_error(message: str, report: Dict[str, List[str]]) -> None:
+    print(f"[ERROR] {message}")
+    report["errors"].append(message)
+
+
+# ------------------------------------------------------------
+# SEMANTIC LAYERING AND SCHEMA ENFORCEMENT
+# ------------------------------------------------------------
+
+
+# ------------------------------------------------------------
+# BUILD BI SEMANTIC
+# ------------------------------------------------------------
+
+
+def build_semantic_layer(run_context: RunContext) -> Dict:
+
+    report = init_report()
+
+    def info(msg):
+        log_info(msg, report)
+
+    def error(msg):
+        log_error(msg, report)
+
+    assembled_path = run_context.assembled_path
+
+    df = load_logical_table(
+        assembled_path,
+        "assembled_events",
+        log_info=info,
+        log_error=error,
+    )
+
+    if df is None or df.empty:
+        error("assembled events is empty")
+        report["status"] = "failed"
+
+        return report
+
+    fact_seller = pd.DataFrame()
+    dim_seller = pd.DataFrame()
+
+    fulfillment_tables = {
+        "seller_week_fulfillment_fact.parquet": fact_seller,
+        "dim_seller.parquet": dim_seller,
+    }
+
+    for table_name, table in fulfillment_tables.items():
+
+        output_path = run_context.semantic_path / table_name
+
+        if not export_file(table, output_path):
+            error(f"{table_name}: Export failed")
+            report["status"] = "failed"
+            break
+
+        info(f"Export success: {table_name} ({len(table)} rows)")
+
+    return report
+
 
 # =============================================================================
 # END OF SCRIPT
diff --git a/data_pipeline/stages/validate_raw_data.py b/data_pipeline/stages/validate_raw_data.py
index 80e27b7..db9a320 100644
--- a/data_pipeline/stages/validate_raw_data.py
+++ b/data_pipeline/stages/validate_raw_data.py
@@ -364,7 +364,7 @@ def error(msg: str):
         df = load_logical_table(base_path, table_name, log_info=info, log_error=error)
 
         if df is None:
-            log_error(f"{table_name} logical table is missing", report)
+            error(f"{table_name} logical table is missing")
             continue
 
         loaded_table_names.add(table_name)
@@ -385,7 +385,7 @@ def error(msg: str):
 
     missing_tables = sorted(expected_tables - loaded_table_names)
     if missing_tables:
-        log_error(f"missing expected table(s) {missing_tables}", report)
+        error(f"missing expected table(s) {missing_tables}")
 
     run_cross_table_validations(tables, report)