diff --git a/backend/.env.example b/backend/.env.example
index be99c9c..9710d63 100755
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -18,7 +18,10 @@ S3_BUCKET=your-bucket-name
 # JWT Authentication
 # =============================================================================
 JWT_SECRET=change-this-to-a-strong-secret-at-least-32-characters
-
+JWT_EXPIRATION=7d
+PASSWORD_PEPPER=some-random-string-for-password-hashing
+COOKIE_SECRET=change-this-to-something-secure
+COOKIE_DOMAIN=localhost
 # =============================================================================
 # Server Configuration
 # =============================================================================
diff --git a/backend/internal/infrastructure/auth/jwt_service.go b/backend/internal/infrastructure/auth/jwt_service.go
index ac156a8..f2e67fe 100644
--- a/backend/internal/infrastructure/auth/jwt_service.go
+++ b/backend/internal/infrastructure/auth/jwt_service.go
@@ -3,6 +3,8 @@ package auth
 import (
 	"errors"
 	"os"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/golang-jwt/jwt/v5"
@@ -41,12 +43,36 @@ func (s *JWTService) VerifyPassword(hash, password string) bool {
 }
 
 func (s *JWTService) GenerateToken(userID, tenantID string, roles []string) (string, error) {
+	// Parse expiration from env
+	expirationStr := os.Getenv("JWT_EXPIRATION")
+	var expirationDuration time.Duration
+	var err error
+
+	if expirationStr == "" {
+		expirationDuration = time.Hour * 24 // Default 24h
+	} else {
+		if strings.HasSuffix(expirationStr, "d") {
+			daysStr := strings.TrimSuffix(expirationStr, "d")
+			days, err := strconv.Atoi(daysStr)
+			if err == nil {
+				expirationDuration = time.Hour * 24 * time.Duration(days)
+			} else {
+				expirationDuration = time.Hour * 24 // Fallback
+			}
+		} else {
+			expirationDuration, err = time.ParseDuration(expirationStr)
+			if err != nil {
+				expirationDuration = time.Hour * 24 // Fallback
+			}
+		}
+	}
+
 	claims := jwt.MapClaims{
 		"sub":    userID,
 		"tenant": tenantID,
 		"roles":  roles,
 		"iss":    s.issuer,
-		"exp":    time.Now().Add(time.Hour * 24).Unix(), // 24 hours
+		"exp":    time.Now().Add(expirationDuration).Unix(),
 		"iat":    time.Now().Unix(),
 	}
 
diff --git a/backend/migrations/010_seed_super_admin.sql b/backend/migrations/010_seed_super_admin.sql
index 3b26bf9..8bbc14e 100644
--- a/backend/migrations/010_seed_super_admin.sql
+++ b/backend/migrations/010_seed_super_admin.sql
@@ -15,7 +15,9 @@ VALUES (
 ) ON CONFLICT (id) DO NOTHING;
 
 -- 2. Insert Super Admin User
--- Password: "password123" (BCrypt hash)
+-- WARNING: This hash is generated WITHOUT PASSWORD_PEPPER.
+-- For development only. Use seeder-api for proper user creation.
+-- Password: "password123" (BCrypt hash without pepper)
 INSERT INTO core_users (id, tenant_id, name, email, password_hash, status, created_at, updated_at)
 VALUES (
     '00000000-0000-0000-0000-000000000002', -- Fixed SuperAdmin User ID
diff --git a/backoffice/.env.example b/backoffice/.env.example
index 32649c7..86f0984 100644
--- a/backoffice/.env.example
+++ b/backoffice/.env.example
@@ -23,11 +23,20 @@ STRIPE_PUBLISHABLE_KEY=pk_test_your_publishable_key
 DATABASE_URL=postgresql://user:password@localhost:5432/gohorse_backoffice
 
 # =============================================================================
-# JWT
+# JWT Authentication (Shared with Backend)
 # =============================================================================
+# The backoffice validates JWT tokens issued by the backend.
+# These values MUST match the backend configuration for auth to work.
+
+# MUST match backend/.env JWT_SECRET exactly
 JWT_SECRET=your-super-secret-jwt-key
+
+# Token expiration (should match backend for consistency)
 JWT_EXPIRATION=7d
 
+# NOTE: PASSWORD_PEPPER is NOT needed here.
+# The backoffice does not handle login - it only validates tokens via Bearer header or cookie.
+
 # =============================================================================
 # Cloudflare API (for cache management)
 # =============================================================================
diff --git a/backoffice/src/app.module.ts b/backoffice/src/app.module.ts
index 68b0c78..e6f05c7 100644
--- a/backoffice/src/app.module.ts
+++ b/backoffice/src/app.module.ts
@@ -5,10 +5,12 @@ import { AppService } from './app.service';
 import { StripeModule } from './stripe';
 import { PlansModule } from './plans';
 import { AdminModule } from './admin';
+import { AuthModule } from './auth';
 
 @Module({
   imports: [
     ConfigModule.forRoot({ isGlobal: true, envFilePath: '.env' }),
+    AuthModule,
     StripeModule,
     PlansModule,
     AdminModule,
@@ -16,4 +18,4 @@ import { AdminModule } from './admin';
   controllers: [AppController],
   providers: [AppService],
 })
-export class AppModule {}
+export class AppModule { }
diff --git a/backoffice/src/auth/auth.module.ts b/backoffice/src/auth/auth.module.ts
new file mode 100644
index 0000000..f3c714c
--- /dev/null
+++ b/backoffice/src/auth/auth.module.ts
@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { JwtAuthGuard } from './jwt-auth.guard';
+
+@Module({
+    imports: [ConfigModule],
+    providers: [JwtAuthGuard],
+    exports: [JwtAuthGuard],
+})
+export class AuthModule { }
diff --git a/backoffice/src/auth/index.ts b/backoffice/src/auth/index.ts
new file mode 100644
index 0000000..f094f34
--- /dev/null
+++ b/backoffice/src/auth/index.ts
@@ -0,0 +1,2 @@
+export * from './auth.module';
+export * from './jwt-auth.guard';
diff --git a/backoffice/src/auth/jwt-auth.guard.ts b/backoffice/src/auth/jwt-auth.guard.ts
new file mode 100644
index 0000000..c2558c2
--- /dev/null
+++ b/backoffice/src/auth/jwt-auth.guard.ts
@@ -0,0 +1,51 @@
+import {
+    Injectable,
+    CanActivate,
+    ExecutionContext,
+    UnauthorizedException,
+} from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import * as jwt from 'jsonwebtoken';
+
+@Injectable()
+export class JwtAuthGuard implements CanActivate {
+    constructor(private readonly configService: ConfigService) { }
+
+    canActivate(context: ExecutionContext): boolean {
+        const request = context.switchToHttp().getRequest();
+        const token = this.extractToken(request);
+
+        if (!token) {
+            throw new UnauthorizedException('Missing authentication token');
+        }
+
+        try {
+            const secret = this.configService.get<string>('JWT_SECRET');
+            if (!secret) {
+                throw new UnauthorizedException('JWT secret not configured');
+            }
+
+            const payload = jwt.verify(token, secret);
+            request.user = payload;
+            return true;
+        } catch {
+            throw new UnauthorizedException('Invalid or expired token');
+        }
+    }
+
+    private extractToken(request: any): string | null {
+        // 1. Try Authorization header first
+        const authHeader = request.headers?.authorization;
+        if (authHeader && authHeader.startsWith('Bearer ')) {
+            return authHeader.slice(7);
+        }
+
+        // 2. Fallback to cookie
+        const cookies = request.cookies;
+        if (cookies?.jwt) {
+            return cookies.jwt;
+        }
+
+        return null;
+    }
+}
diff --git a/backoffice/src/main.ts b/backoffice/src/main.ts
index de3198e..dcf2965 100644
--- a/backoffice/src/main.ts
+++ b/backoffice/src/main.ts
@@ -8,6 +8,7 @@ import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
 import { AppModule } from './app.module';
 import compression from '@fastify/compress';
 import helmet from '@fastify/helmet';
+import cookie from '@fastify/cookie';
 
 async function bootstrap() {
   // Create Fastify adapter with Pino logging
@@ -34,6 +35,7 @@ async function bootstrap() {
   await app.register(helmet, {
     contentSecurityPolicy: process.env.NODE_ENV === 'production',
   });
+  await app.register(cookie); // Enable cookie parsing for JWT auth
 
   // CORS configuration (Fastify-native)
   app.enableCors({
diff --git a/frontend/src/app/page.tsx b/frontend/src/app/page.tsx
index 6bed529..98484e8 100644
--- a/frontend/src/app/page.tsx
+++ b/frontend/src/app/page.tsx
@@ -39,7 +39,7 @@ export default function HomePage() {
             isFeatured: j.isFeatured
           }))
 
-        const featuredRes = await fetch(`${apiBase}/jobs?featured=true&limit=6`)
+        const featuredRes = await fetch(`${apiBase}/api/v1/jobs?featured=true&limit=6`)
         if (!featuredRes.ok) throw new Error("Failed to fetch featured jobs")
         const featuredData = await featuredRes.json()
         const featuredList = featuredData.data ? mapJobs(featuredData.data) : []
@@ -49,7 +49,7 @@ export default function HomePage() {
           return
         }
 
-        const fallbackRes = await fetch(`${apiBase}/jobs?limit=6`)
+        const fallbackRes = await fetch(`${apiBase}/api/v1/jobs?limit=6`)
         if (!fallbackRes.ok) throw new Error("Failed to fetch fallback jobs")
         const fallbackData = await fallbackRes.json()
         const fallbackList = fallbackData.data ? mapJobs(fallbackData.data) : []
diff --git a/frontend/src/lib/auth.ts b/frontend/src/lib/auth.ts
index 5e64982..8645e31 100644
--- a/frontend/src/lib/auth.ts
+++ b/frontend/src/lib/auth.ts
@@ -2,7 +2,8 @@ import { User } from "./types";
 export type { User };
 
 const AUTH_KEY = "job-portal-auth";
-const API_URL = process.env.NEXT_PUBLIC_API_URL || "http://localhost:8521/api/v1";
+const BASE_URL = process.env.NEXT_PUBLIC_API_URL || "http://localhost:8521";
+const API_URL = `${BASE_URL}/api/v1`;
 
 interface LoginResponse {
   token: string;
diff --git a/seeder-api/.env.example b/seeder-api/.env.example
index 77aea58..b3e815e 100644
--- a/seeder-api/.env.example
+++ b/seeder-api/.env.example
@@ -17,3 +17,6 @@ NODE_ENV=development
 
 # Backend API URL (to sync data)
 BACKEND_API_URL=http://localhost:8521/api/v1
+
+# MUST match backend PASSWORD_PEPPER for login to work
+PASSWORD_PEPPER=some-random-string-for-password-hashing
diff --git a/seeder-api/README.md b/seeder-api/README.md
index 17e6eaf..cd1d0e5 100644
--- a/seeder-api/README.md
+++ b/seeder-api/README.md
@@ -105,8 +105,13 @@ DB_PORT=5432
 DB_USER=postgres
 DB_PASSWORD=yourpassword
 DB_NAME=gohorsejobs
+
+# MUST match backend PASSWORD_PEPPER
+PASSWORD_PEPPER=your-pepper-value
 ```
 
+> ⚠️ **IMPORTANTE**: O `PASSWORD_PEPPER` deve ser idêntico ao configurado no backend. Caso contrário, os usuários criados pelo seeder não conseguirão fazer login.
+
 ### Comandos
 
 | Comando | Descrição |
diff --git a/seeder-api/src/seeders/acme.js b/seeder-api/src/seeders/acme.js
index edc876d..7e89554 100644
--- a/seeder-api/src/seeders/acme.js
+++ b/seeder-api/src/seeders/acme.js
@@ -244,7 +244,8 @@ export async function seedWileECoyote() {
 
     try {
         const bcrypt = await import('bcrypt');
-        const hash = await bcrypt.default.hash('MeepMeep@123', 10);
+        const pepper = process.env.PASSWORD_PEPPER || '';
+        const hash = await bcrypt.default.hash('MeepMeep@123' + pepper, 10);
 
         await pool.query(`
             INSERT INTO users (identifier, password_hash, role, full_name, email, city, state, bio, title)
diff --git a/seeder-api/src/seeders/users.js b/seeder-api/src/seeders/users.js
index 77445ca..7f63f87 100644
--- a/seeder-api/src/seeders/users.js
+++ b/seeder-api/src/seeders/users.js
@@ -3,6 +3,9 @@ import bcrypt from 'bcrypt';
 import crypto from 'crypto';
 import { pool } from '../db.js';
 
+// Get pepper from environment - MUST match backend PASSWORD_PEPPER
+const PASSWORD_PEPPER = process.env.PASSWORD_PEPPER || '';
+
 export async function seedUsers() {
     console.log('👤 Seeding users (Core Architecture)...');
 
@@ -14,7 +17,7 @@ export async function seedUsers() {
         const systemTenantId = '00000000-0000-0000-0000-000000000000';
 
         // 1. Create SuperAdmin (Requested: superadmin / Admin@2025!)
-        const superAdminPassword = await bcrypt.hash('Admin@2025!', 10);
+        const superAdminPassword = await bcrypt.hash('Admin@2025!' + PASSWORD_PEPPER, 10);
         const superAdminId = crypto.randomUUID();
         // User requested identifier 'superadmin'
         const superAdminIdentifier = 'superadmin';
@@ -47,7 +50,7 @@ export async function seedUsers() {
         ];
 
         for (const admin of companyAdmins) {
-            const hash = await bcrypt.hash(admin.pass, 10);
+            const hash = await bcrypt.hash(admin.pass + PASSWORD_PEPPER, 10);
             const userId = crypto.randomUUID();
             const tenantId = companyMap[admin.company];
 
@@ -84,7 +87,7 @@ export async function seedUsers() {
         ];
 
         for (const cand of candidates) {
-            const hash = await bcrypt.hash(cand.pass, 10);
+            const hash = await bcrypt.hash(cand.pass + PASSWORD_PEPPER, 10);
             const userId = crypto.randomUUID();
 
             const result = await pool.query(`
@@ -175,7 +178,7 @@ export async function seedUsers() {
         ];
 
         for (const cand of legacyCandidates) {
-            const hash = await bcrypt.hash('User@2025', 10);
+            const hash = await bcrypt.hash('User@2025' + PASSWORD_PEPPER, 10);
             await pool.query(`
                 INSERT INTO users (
                     identifier,