diff --git a/app/Dockerfile b/app/Dockerfile
index 1699fc5..723aacb 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -10,4 +10,4 @@ COPY public ./public
 # Runtime mappers read JSON files from src/mappings, so they must be copied into the image.
 COPY src ./src
 
-CMD ["npm", "run", "dev"]
+CMD ["npm", "run", "start"]
diff --git a/app/package.json b/app/package.json
index df3f589..3399ecd 100644
--- a/app/package.json
+++ b/app/package.json
@@ -3,9 +3,9 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev":   "tsx watch --env-file=.env src/index.ts",
+    "dev": "tsx watch src/index.ts",
     "build": "tsc",
-    "start": "node --env-file=.env dist/index.js"
+    "start": "tsx src/index.ts"
   },
   "dependencies": {
     "@types/node": "^25.9.1",
diff --git a/app/src/cloud-ingest.ts b/app/src/cloud-ingest.ts
index 120c53c..abd18bc 100644
--- a/app/src/cloud-ingest.ts
+++ b/app/src/cloud-ingest.ts
@@ -1,7 +1,4 @@
-const DEFAULT_CLOUD_INGEST_URL = 'http://localhost:3101/ingest'
-
-export const cloudIngestUrl =
-  process.env.CLOUD_INGEST_URL ?? DEFAULT_CLOUD_INGEST_URL
+export const cloudIngestUrl = process.env.CLOUD_INGEST_URL as string
 
 export function postCloudIngest(body: unknown): Promise<Response> {
   return fetch(cloudIngestUrl, {
diff --git a/app/src/handlers/edge5-modbus-v2.ts b/app/src/handlers/edge5-modbus-v2.ts
index 2167fe4..ee6d67a 100644
--- a/app/src/handlers/edge5-modbus-v2.ts
+++ b/app/src/handlers/edge5-modbus-v2.ts
@@ -5,9 +5,7 @@ import type { TopicHandler } from '../types.js'
 export const TOPIC = 'data/edge5/modbus/v2'
 
 const mapper = createMetricMapper({
-  filePath:
-    process.env.EDGE5_MODBUS_V2_MAPPING_FILE ??
-    new URL('../mappings/edge5-modbus.json', import.meta.url),
+  filePath: process.env.EDGE5_MODBUS_V2_MAPPING_FILE as string,
 })
 const REGISTER_COUNT = mapper.tagCount
 
diff --git a/app/src/http/server.ts b/app/src/http/server.ts
index 42ec1de..edf9d15 100644
--- a/app/src/http/server.ts
+++ b/app/src/http/server.ts
@@ -3,7 +3,7 @@ import { createServer } from 'node:http'
 import { dirname, join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 
-const httpPort = Number(process.env.HTTP_PORT ?? 80)
+const httpPort = Number(process.env.HTTP_PORT)
 const publicDir = join(dirname(fileURLToPath(import.meta.url)), '../../public')
 const indexPath = join(publicDir, 'index.html')
 
diff --git a/app/src/mqtt.ts b/app/src/mqtt.ts
index a178558..994ef29 100644
--- a/app/src/mqtt.ts
+++ b/app/src/mqtt.ts
@@ -3,7 +3,7 @@ import mqtt from 'mqtt'
 import { getRegisteredTopics } from './registry.js'
 import { routeMessage } from './router.js'
 
-const mqttUrl = process.env.MQTT_URL ?? 'mqtt://localhost:1883'
+const mqttUrl = process.env.MQTT_URL as string
 
 export const mqttClient = mqtt.connect(mqttUrl)
 
diff --git a/app/src/stream/edge-chunk-relay.ts b/app/src/stream/edge-chunk-relay.ts
index 040ae55..c61ad32 100644
--- a/app/src/stream/edge-chunk-relay.ts
+++ b/app/src/stream/edge-chunk-relay.ts
@@ -1,7 +1,7 @@
 import type { IncomingMessage } from 'http'
 import { WebSocket, WebSocketServer } from 'ws'
 
-const wsPort = Number(process.env.WS_PORT ?? 9090)
+const wsPort = Number(process.env.WS_PORT)
 
 const wss = new WebSocketServer({ port: wsPort, perMessageDeflate: false })
 const clients = new Set<WebSocket>()