diff --git a/.env.example b/.env.example
index 6e20640..9b464f3 100644
--- a/.env.example
+++ b/.env.example
@@ -14,6 +14,7 @@ DB_NAME=omnichannel
 FRONTEND_URL=http://localhost:3000
 JWT_SECRET=change-this-long-random-secret
 JWT_EXPIRES_IN=8h
+LOG_LEVEL=info
 
 # Auth providers: ldap,microsoft or only one of them
 AUTH_PROVIDERS=ldap,microsoft
diff --git a/src/infra/config/env.ts b/src/infra/config/env.ts
new file mode 100644
index 0000000..4ade43a
--- /dev/null
+++ b/src/infra/config/env.ts
@@ -0,0 +1,49 @@
+export interface DatabaseConfig {
+  host: string;
+  port: number;
+  user: string;
+  password: string;
+  database: string;
+}
+
+const REQUIRED_ENV = ['DB_HOST', 'DB_PORT', 'DB_USER', 'DB_PASSWORD', 'DB_NAME', 'JWT_SECRET'];
+
+export function validateAppEnv() {
+  const missing = REQUIRED_ENV.filter((name) => !String(process.env[name] || '').trim());
+
+  if (missing.length) {
+    throw new Error(`Variaveis de ambiente obrigatorias ausentes: ${missing.join(', ')}`);
+  }
+
+  getNumberEnv('DB_PORT');
+}
+
+export function getDatabaseConfig(): DatabaseConfig {
+  return {
+    host: getRequiredEnv('DB_HOST'),
+    port: getNumberEnv('DB_PORT'),
+    user: getRequiredEnv('DB_USER'),
+    password: getRequiredEnv('DB_PASSWORD'),
+    database: getRequiredEnv('DB_NAME'),
+  };
+}
+
+function getRequiredEnv(name: string) {
+  const value = String(process.env[name] || '').trim();
+
+  if (!value) {
+    throw new Error(`Variavel de ambiente obrigatoria ausente: ${name}`);
+  }
+
+  return value;
+}
+
+function getNumberEnv(name: string) {
+  const value = Number(getRequiredEnv(name));
+
+  if (!Number.isFinite(value)) {
+    throw new Error(`Variavel de ambiente invalida: ${name} deve ser numerica`);
+  }
+
+  return value;
+}
diff --git a/src/infra/database/database.service.ts b/src/infra/database/database.service.ts
index b00bb40..cb1bbe4 100644
--- a/src/infra/database/database.service.ts
+++ b/src/infra/database/database.service.ts
@@ -1,15 +1,10 @@
 import { Injectable, OnModuleDestroy } from '@nestjs/common';
 import { Pool, PoolClient, QueryResultRow } from 'pg';
+import { getDatabaseConfig } from '../config/env';
 
 @Injectable()
 export class DatabaseService implements OnModuleDestroy {
-  private readonly pool = new Pool({
-    host: process.env.DB_HOST || 'localhost',
-    port: Number(process.env.DB_PORT || 5432),
-    user: process.env.DB_USER || process.env.POSTGRES_USER,
-    password: process.env.DB_PASSWORD || process.env.POSTGRES_PASSWORD,
-    database: process.env.DB_NAME || process.env.POSTGRES_DB,
-  });
+  private readonly pool = new Pool(getDatabaseConfig());
 
   query<T extends QueryResultRow = QueryResultRow>(text: string, params?: unknown[]) {
     return this.pool.query<T>(text, params);
diff --git a/src/infra/shared/logger.ts b/src/infra/shared/logger.ts
deleted file mode 100644
index ec86896..0000000
--- a/src/infra/shared/logger.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import { Logger } from '@nestjs/common';
-
-export const appLogger = new Logger('Application');
diff --git a/src/main.ts b/src/main.ts
index 8e323f2..5581a8e 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -4,10 +4,12 @@ import { NestFactory } from '@nestjs/core';
 import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger';
 import { json, urlencoded } from 'express';
 import { AppModule } from './app.module';
+import { validateAppEnv } from './infra/config/env';
 import { loadEnv } from './infra/config/load-env';
 
 async function bootstrap() {
   loadEnv();
+  validateAppEnv();
 
   const app = await NestFactory.create(AppModule, { bodyParser: false });
   const frontendUrl = process.env.FRONTEND_URL || 'http://localhost:3000';