diff --git a/ui/src/api/queries/admin/apps.ts b/ui/src/api/queries/admin/apps.ts
index 9a309229..c868c784 100644
--- a/ui/src/api/queries/admin/apps.ts
+++ b/ui/src/api/queries/admin/apps.ts
@@ -20,6 +20,8 @@ export interface AppVersion {
   jarChecksum: string;
   jarFilename: string;
   jarSizeBytes: number;
+  detectedRuntimeType: string | null;
+  detectedMainClass: string | null;
   uploadedAt: string;
 }
 
diff --git a/ui/src/pages/AppsTab/AppsTab.tsx b/ui/src/pages/AppsTab/AppsTab.tsx
index a098d6b3..da9d08e2 100644
--- a/ui/src/pages/AppsTab/AppsTab.tsx
+++ b/ui/src/pages/AppsTab/AppsTab.tsx
@@ -209,6 +209,8 @@ function CreateAppView({ environments, selectedEnv }: { environments: Environmen
   const [deployStrategy, setDeployStrategy] = useState('blue-green');
   const [stripPrefix, setStripPrefix] = useState(true);
   const [sslOffloading, setSslOffloading] = useState(true);
+  const [runtimeType, setRuntimeType] = useState(String(defaults.runtimeType ?? 'auto'));
+  const [customArgs, setCustomArgs] = useState(String(defaults.customArgs ?? ''));
 
   const [configTab, setConfigTab] = useState<'monitoring' | 'resources' | 'variables'>('monitoring');
   const [busy, setBusy] = useState(false);
@@ -222,6 +224,8 @@ function CreateAppView({ environments, selectedEnv }: { environments: Environmen
     setCpuRequest(String(d.cpuRequest ?? 500));
     setCpuLimit(String(d.cpuLimit ?? ''));
     setPorts(Array.isArray(d.exposedPorts) ? d.exposedPorts as number[] : []);
+    setRuntimeType(String(d.runtimeType ?? 'auto'));
+    setCustomArgs(String(d.customArgs ?? ''));
   }, [envId, environments]);
 
   useEffect(() => {
@@ -261,6 +265,8 @@ function CreateAppView({ environments, selectedEnv }: { environments: Environmen
         deploymentStrategy: deployStrategy,
         stripPathPrefix: stripPrefix,
         sslOffloading: sslOffloading,
+        runtimeType: runtimeType,
+        customArgs: customArgs || null,
       };
       await updateContainerConfig.mutateAsync({ appId: app.slug, config: containerConfig });
 
@@ -821,6 +827,12 @@ function ConfigSubTab({ app, environment }: { app: App; environment?: Environmen
   const [deployStrategy, setDeployStrategy] = useState('blue-green');
   const [stripPrefix, setStripPrefix] = useState(true);
   const [sslOffloading, setSslOffloading] = useState(true);
+  const [runtimeType, setRuntimeType] = useState(String(merged.runtimeType ?? 'auto'));
+  const [customArgs, setCustomArgs] = useState(String(merged.customArgs ?? ''));
+
+  // Versions query for runtime detection hints
+  const { data: versions = [] } = useAppVersions(app.slug);
+  const latestVersion = versions?.[0] ?? null;
 
   // Sync from server data
   const syncFromServer = useCallback(() => {
@@ -848,6 +860,8 @@ function ConfigSubTab({ app, environment }: { app: App; environment?: Environmen
     setDeployStrategy(String(merged.deploymentStrategy ?? 'blue-green'));
     setStripPrefix(merged.stripPathPrefix !== false);
     setSslOffloading(merged.sslOffloading !== false);
+    setRuntimeType(String(merged.runtimeType ?? 'auto'));
+    setCustomArgs(String(merged.customArgs ?? ''));
   }, [agentConfig, merged]);
 
   useEffect(() => { syncFromServer(); }, [syncFromServer]);
@@ -897,6 +911,8 @@ function ConfigSubTab({ app, environment }: { app: App; environment?: Environmen
       deploymentStrategy: deployStrategy,
       stripPathPrefix: stripPrefix,
       sslOffloading: sslOffloading,
+      runtimeType: runtimeType,
+      customArgs: customArgs || null,
     };
     try {
       await updateContainerConfig.mutateAsync({ appId: app.slug, config: containerConfig });
@@ -1092,6 +1108,37 @@ function ConfigSubTab({ app, environment }: { app: App; environment?: Environmen
         <div className={sectionStyles.section}>
           <SectionHeader>Container Resources</SectionHeader>
           <div className={styles.configGrid}>
+            <span className={styles.configLabel}>Runtime Type</span>
+            <div>
+              <Select disabled={!editing} value={runtimeType} onChange={(e) => setRuntimeType(e.target.value)}
+                options={[
+                  { value: 'auto', label: 'Auto (detect from JAR)' },
+                  { value: 'spring-boot', label: 'Spring Boot' },
+                  { value: 'quarkus', label: 'Quarkus' },
+                  { value: 'plain-java', label: 'Plain Java' },
+                  { value: 'native', label: 'Native' },
+                ]} />
+              {latestVersion?.detectedRuntimeType && (
+                <span className={styles.configHint} style={{ color: 'var(--success)' }}>
+                  Detected: {latestVersion.detectedRuntimeType}
+                </span>
+              )}
+              {latestVersion && !latestVersion.detectedRuntimeType && (
+                <span className={styles.configHint} style={{ color: 'var(--amber)' }}>
+                  Detection failed — select runtime type manually
+                </span>
+              )}
+            </div>
+
+            <span className={styles.configLabel}>Custom Arguments</span>
+            <div>
+              <Input disabled={!editing} value={customArgs} onChange={(e) => setCustomArgs(e.target.value)}
+                placeholder="-Xmx256m -Dfoo=bar" className={styles.inputLg} />
+              <span className={styles.configHint}>
+                {runtimeType === 'native' ? 'Arguments passed to the native binary' : 'Additional JVM arguments appended to the start command'}
+              </span>
+            </div>
+
             <span className={styles.configLabel}>Memory Limit</span>
             <div className={styles.configInline}>
               <Input disabled={!editing} value={memoryLimit} onChange={(e) => setMemoryLimit(e.target.value)} className={styles.inputLg} />