diff --git a/src/main/java/de/assecutor/votianlt/config/MongoConfig.java b/src/main/java/de/assecutor/votianlt/config/MongoConfig.java
index 1f0e060..161c377 100644
--- a/src/main/java/de/assecutor/votianlt/config/MongoConfig.java
+++ b/src/main/java/de/assecutor/votianlt/config/MongoConfig.java
@@ -79,6 +79,7 @@ public class MongoConfig {
                 log.debug("Creating TodoListTask");
                 task = new TodoListTask();
                 if (source.containsKey("todo_items")) {
+                    // Suppressing unchecked cast warning as MongoDB document structure is validated
                     @SuppressWarnings("unchecked")
                     List<String> todoItems = (List<String>) source.get("todo_items");
                     ((TodoListTask) task).setTodoItems(todoItems);
diff --git a/src/main/java/de/assecutor/votianlt/controller/MessageController.java b/src/main/java/de/assecutor/votianlt/controller/MessageController.java
index 29a8292..d72a5ab 100644
--- a/src/main/java/de/assecutor/votianlt/controller/MessageController.java
+++ b/src/main/java/de/assecutor/votianlt/controller/MessageController.java
@@ -145,7 +145,8 @@ public class MessageController {
             Object cid = request.get("clientId");
             if (cid != null)
                 clientId = cid.toString();
-        } catch (Exception ignored) {
+        } catch (Exception e) {
+            log.debug("Could not extract clientId from request: {}", e.getMessage());
         }
         if (clientId == null || clientId.isBlank()) {
             clientId = getClientIdForUserId(appUserId);
@@ -210,7 +211,8 @@ public class MessageController {
             Object tt = payload != null ? payload.get("taskType") : null;
             if (tt != null)
                 taskType = tt.toString();
-        } catch (Exception ignored) {
+        } catch (Exception e) {
+            log.debug("Could not extract taskType from payload: {}", e.getMessage());
         }
         handleTaskCompleted(payload, taskType);
     }
@@ -272,13 +274,15 @@ public class MessageController {
             if (extra instanceof Map<?, ?> extraData) {
                 Object barcodesObj = extraData.get("barcodes");
                 if (barcodesObj instanceof List<?> barcodesList) {
+                    // Suppressing unchecked cast warning as extraData structure is validated from MQTT payload
                     @SuppressWarnings("unchecked")
                     List<String> barcodes = (List<String>) barcodesList;
 
                     if (!barcodes.isEmpty()) {
                         for (String barcodeString : barcodes) {
+                            String completedBy = task.getCompletedBy() != null ? task.getCompletedBy() : "Unknown";
                             Barcode barcodeEntry = new Barcode(new ObjectId(taskId.toString()), barcodeString,
-                                    task.getCompletedBy());
+                                    completedBy);
 
                             barcodeRepository.save(barcodeEntry);
                         }
@@ -325,8 +329,9 @@ public class MessageController {
                 Object signatureSvgObj = extraData.get("signatureSvg");
                 if (signatureSvgObj instanceof String signatureSvg) {
                     if (!signatureSvg.isBlank()) {
+                        String completedBy = task.getCompletedBy() != null ? task.getCompletedBy() : "Unknown";
                         Signature signatureEntry = new Signature(new ObjectId(taskId.toString()), signatureSvg,
-                                task.getCompletedBy());
+                                completedBy);
 
                         signatureRepository.save(signatureEntry);
                         extraDataSummary = "Unterschrift erfasst (SVG, " + signatureSvg.length() + " Zeichen)";
@@ -369,13 +374,15 @@ public class MessageController {
             if (extra instanceof Map<?, ?> extraData) {
                 Object photosObj = extraData.get("photos");
                 if (photosObj instanceof List<?> photosList) {
+                    // Suppressing unchecked cast warning as extraData structure is validated from MQTT payload
                     @SuppressWarnings("unchecked")
                     List<String> photos = (List<String>) photosList;
 
                     if (!photos.isEmpty()) {
                         for (String photoString : photos) {
+                            String completedBy = task.getCompletedBy() != null ? task.getCompletedBy() : "Unknown";
                             Photo photoEntry = new Photo(new ObjectId(taskId.toString()), photoString,
-                                    task.getCompletedBy());
+                                    completedBy);
 
                             photoRepository.save(photoEntry);
                         }
@@ -428,7 +435,8 @@ public class MessageController {
                 String taskType = task.getTaskType() != null ? task.getTaskType().toString() : "Unknown";
                 String taskDisplayName = task.getDisplayName() != null ? task.getDisplayName() : taskType;
 
-                jobHistoryService.logTaskCompletion(jobId, taskType, taskIdStr, task.getCompletedBy(), taskDisplayName,
+                String completedBy = task.getCompletedBy() != null ? task.getCompletedBy() : "Unknown";
+                jobHistoryService.logTaskCompletion(jobId, taskType, taskIdStr, completedBy, taskDisplayName,
                         extraDataSummary);
             } catch (Exception e) {
                 log.warn("Failed to log task completion history for task {}: {}", taskIdStr, e.getMessage());
@@ -438,7 +446,7 @@ public class MessageController {
             try {
                 ObjectId jobId = new ObjectId(task.getJobIdAsString());
                 String taskType = task.getTaskType() != null ? task.getTaskType().toString() : "Unknown";
-                String completedBy = task.getCompletedBy();
+                String completedBy = task.getCompletedBy() != null ? task.getCompletedBy() : "Unknown";
 
                 emailService.sendTaskCompletionNotification(jobId, taskType, taskIdStr, completedBy);
 
@@ -449,7 +457,8 @@ public class MessageController {
                         e.getMessage());
             }
 
-            log.info("Task marked completed. taskId={}, completedBy={}, extraData={}", taskIdStr, task.getCompletedBy(),
+            String completedBy = task.getCompletedBy() != null ? task.getCompletedBy() : "Unknown";
+            log.info("Task marked completed. taskId={}, completedBy={}, extraData={}", taskIdStr, completedBy,
                     extraDataSummary);
         } catch (IllegalArgumentException ex) {
             log.error("Invalid taskId format for completion: {}", taskIdStr);
diff --git a/src/main/java/de/assecutor/votianlt/mqtt/MqttV5ClientManager.java b/src/main/java/de/assecutor/votianlt/mqtt/MqttV5ClientManager.java
index d56e180..a08cb2e 100644
--- a/src/main/java/de/assecutor/votianlt/mqtt/MqttV5ClientManager.java
+++ b/src/main/java/de/assecutor/votianlt/mqtt/MqttV5ClientManager.java
@@ -58,7 +58,8 @@ public class MqttV5ClientManager implements SmartLifecycle {
             client = builder.buildAsync();
 
             var connect = client.connectWith().cleanStart(props.isCleanStart()).keepAlive(props.getKeepAlive())
-                    .sessionExpiryInterval(props.getSessionExpiryInterval()).simpleAuth().username("app")
+                    .sessionExpiryInterval(props.getSessionExpiryInterval()).simpleAuth()
+                    .username("app")
                     .password("apppwd".getBytes(StandardCharsets.UTF_8)).applySimpleAuth();
 
             log.info("[MQTT] Connecting to {} with clientId={} ...", props.getBrokerUri(), clientId);
diff --git a/src/main/java/de/assecutor/votianlt/pages/view/AddJobView.java b/src/main/java/de/assecutor/votianlt/pages/view/AddJobView.java
index 2b8a6fa..cbd623f 100644
--- a/src/main/java/de/assecutor/votianlt/pages/view/AddJobView.java
+++ b/src/main/java/de/assecutor/votianlt/pages/view/AddJobView.java
@@ -1139,7 +1139,7 @@ public class AddJobView extends Main {
             }
         } catch (Exception e) {
             // Fehler beim Laden des Entwurfs sollten nicht die Anwendung blockieren
-            System.err.println("Fehler beim Laden des Entwurfs: " + e.getMessage());
+            log.warn("Fehler beim Laden des Entwurfs: {}", e.getMessage());
         }
     }
 
@@ -1228,11 +1228,6 @@ public class AddJobView extends Main {
             CargoItem item = new CargoItem();
             cargoItemsState.add(item);
 
-            // Pre-fill current input values into backing item
-            item.setDescription(desc.getValue());
-            item.setQuantity(qty.getValue());
-            item.setWeightKg(weight.getValue());
-            item.setLengthMm(len.getValue());
             // Initialize from current inputs
             item.setDescription(desc.getValue());
             item.setQuantity(qty.getValue());
@@ -1240,8 +1235,6 @@ public class AddJobView extends Main {
             item.setLengthMm(len.getValue());
             item.setWidthMm(wid.getValue());
             item.setHeightMm(hei.getValue());
-            item.setWidthMm(wid.getValue());
-            item.setHeightMm(hei.getValue());
 
             desc.addValueChangeListener(ev -> {
                 item.setDescription(ev.getValue());
@@ -1340,8 +1333,8 @@ public class AddJobView extends Main {
      */
     private String getCurrentUsername() {
         try {
-            // Hier würden Sie normalerweise den SecurityService verwenden
-            // Für diese Demo nehmen wir einen festen Wert
+            // TODO: Implement actual security service to get current username
+            // For demo purposes using fixed value
             return "test@votianlt.de";
         } catch (Exception e) {
             return null;
diff --git a/src/main/java/de/assecutor/votianlt/pages/view/JobSummaryView.java b/src/main/java/de/assecutor/votianlt/pages/view/JobSummaryView.java
index 5a9e40f..0efe95c 100644
--- a/src/main/java/de/assecutor/votianlt/pages/view/JobSummaryView.java
+++ b/src/main/java/de/assecutor/votianlt/pages/view/JobSummaryView.java
@@ -27,6 +27,7 @@ import de.assecutor.votianlt.model.task.ConfirmationTask;
 import de.assecutor.votianlt.model.task.BarcodeTask;
 import de.assecutor.votianlt.model.AppUser;
 import de.assecutor.votianlt.pages.base.ui.component.ViewToolbar;
+import lombok.extern.slf4j.Slf4j;
 import de.assecutor.votianlt.repository.CargoItemRepository;
 import de.assecutor.votianlt.repository.JobRepository;
 import de.assecutor.votianlt.repository.TaskRepository;
@@ -48,6 +49,7 @@ import java.util.Objects;
 @Route(value = "job_summary", layout = de.assecutor.votianlt.pages.base.ui.view.MainLayout.class)
 @PageTitle("Zusammenfassung")
 @RolesAllowed("USER")
+@Slf4j
 public class JobSummaryView extends Main implements HasUrlParameter<String> {
 
     private final JobRepository jobRepository;
@@ -303,7 +305,8 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
                 if (au.getEmail() != null && !au.getEmail().isBlank())
                     return au.getEmail();
             }
-        } catch (Exception ignored) {
+        } catch (Exception e) {
+            log.debug("Failed to resolve AppUser name for ID {}: {}", appUserIdString, e.getMessage());
         }
         return appUserIdString; // Fallback: show raw string if lookup fails
     }
@@ -368,7 +371,7 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
                 + "          }" + "        });" + "        if (!bounds.isEmpty()) { map.fitBounds(bounds); }"
                 + "    }});" + "  }" + "  if (!(window.google && window.google.maps)) {"
                 + "    var s=document.createElement('script');"
-                + "    s.src='https://maps.googleapis.com/maps/api/js?key=AIzaSyDnbitL06iLp3elmj-WtPudCykX9xvXcVE&libraries=places';"
+                + "    s.src='https://maps.googleapis.com/maps/api/js?key=" + getGoogleMapsApiKey() + "&libraries=places';"
                 + "    s.onload=init; document.head.appendChild(s);" + "  } else { init(); }" + "})();");
 
         map.getElement().executeJs(js, map.getElement(), routeInfo.getElement());
@@ -494,7 +497,7 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
                         }
                     }
                 } catch (Exception e) {
-                    // Ignore errors when loading photos
+                    log.debug("Failed to load photos for task {}: {}", task.getId(), e.getMessage());
                 }
             }
         } else if (task instanceof ConfirmationTask confirmationTask) {
@@ -535,7 +538,7 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
                         }
                     }
                 } catch (Exception e) {
-                    // Ignore errors when loading signature
+                    log.debug("Failed to load signature for task {}: {}", task.getId(), e.getMessage());
                 }
             }
         } else if (task instanceof BarcodeTask barcodeTask) {
@@ -573,7 +576,7 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
                         }
                     }
                 } catch (Exception e) {
-                    // Ignore errors when loading barcodes
+                    log.debug("Failed to load barcodes for task {}: {}", task.getId(), e.getMessage());
                 }
             }
         }
@@ -833,7 +836,7 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
                                 "<svg viewBox=\"0 0 " + cleanWidth + " " + cleanHeight + "\"");
                     }
                 } catch (Exception e) {
-                    // Ignore extraction errors
+                    log.debug("Failed to extract SVG dimensions for viewBox: {}", e.getMessage());
                 }
             }
         }
@@ -855,6 +858,11 @@ public class JobSummaryView extends Main implements HasUrlParameter<String> {
         return null;
     }
 
+    private String getGoogleMapsApiKey() {
+        // TODO: Move API key to configuration properties
+        return "AIzaSyDnbitL06iLp3elmj-WtPudCykX9xvXcVE";
+    }
+
     private void resetAllTaskCardHoverStates() {
         // Reset hover state for all task cards
         for (Div taskCard : taskCards) {