diff --git a/.gitignore b/.gitignore
index e05b688..d8748a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,7 +12,9 @@ coverage/
 dist/
 build/
 .next/
-out/
+# Only ignore Next.js output directory, not all 'out' folders
+/.next/out/
+/apps/frontend/out/
 
 # Environment variables
 .env
diff --git a/apps/backend/src/domain/ports/out/audit-log.repository.ts b/apps/backend/src/domain/ports/out/audit-log.repository.ts
new file mode 100644
index 0000000..4212346
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/audit-log.repository.ts
@@ -0,0 +1,59 @@
+/**
+ * Audit Log Repository Port
+ *
+ * Defines the interface for Audit Log persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { AuditLog } from '../../entities/audit-log.entity';
+
+export const AUDIT_LOG_REPOSITORY = 'AuditLogRepository';
+
+export interface AuditLogFilters {
+  userId?: string;
+  organizationId?: string;
+  action?: string[];
+  resourceType?: string;
+  resourceId?: string;
+  dateFrom?: Date;
+  dateTo?: Date;
+  limit?: number;
+  offset?: number;
+}
+
+export interface AuditLogRepository {
+  /**
+   * Save an audit log entry
+   */
+  save(auditLog: AuditLog): Promise<void>;
+
+  /**
+   * Find audit log by ID
+   */
+  findById(id: string): Promise<AuditLog | null>;
+
+  /**
+   * Find audit logs by filters
+   */
+  findByFilters(filters: AuditLogFilters): Promise<AuditLog[]>;
+
+  /**
+   * Count audit logs matching filters
+   */
+  count(filters: AuditLogFilters): Promise<number>;
+
+  /**
+   * Find audit logs for a specific resource
+   */
+  findByResource(resourceType: string, resourceId: string): Promise<AuditLog[]>;
+
+  /**
+   * Find recent audit logs for an organization
+   */
+  findRecentByOrganization(organizationId: string, limit: number): Promise<AuditLog[]>;
+
+  /**
+   * Find audit logs by user
+   */
+  findByUser(userId: string, limit: number): Promise<AuditLog[]>;
+}
diff --git a/apps/backend/src/domain/ports/out/booking.repository.ts b/apps/backend/src/domain/ports/out/booking.repository.ts
new file mode 100644
index 0000000..6376928
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/booking.repository.ts
@@ -0,0 +1,49 @@
+/**
+ * Booking Repository Port
+ *
+ * Defines the interface for Booking persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { Booking } from '../../entities/booking.entity';
+import { BookingNumber } from '../../value-objects/booking-number.vo';
+import { BookingStatus } from '../../value-objects/booking-status.vo';
+
+export const BOOKING_REPOSITORY = 'BookingRepository';
+
+export interface BookingRepository {
+  /**
+   * Save a booking entity
+   */
+  save(booking: Booking): Promise<Booking>;
+
+  /**
+   * Find booking by ID
+   */
+  findById(id: string): Promise<Booking | null>;
+
+  /**
+   * Find booking by booking number
+   */
+  findByBookingNumber(bookingNumber: BookingNumber): Promise<Booking | null>;
+
+  /**
+   * Find all bookings for a specific user
+   */
+  findByUser(userId: string): Promise<Booking[]>;
+
+  /**
+   * Find all bookings for an organization
+   */
+  findByOrganization(organizationId: string): Promise<Booking[]>;
+
+  /**
+   * Find all bookings with a specific status
+   */
+  findByStatus(status: BookingStatus): Promise<Booking[]>;
+
+  /**
+   * Delete booking by ID
+   */
+  delete(id: string): Promise<void>;
+}
diff --git a/apps/backend/src/domain/ports/out/cache.port.ts b/apps/backend/src/domain/ports/out/cache.port.ts
new file mode 100644
index 0000000..ae07254
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/cache.port.ts
@@ -0,0 +1,60 @@
+/**
+ * Cache Port
+ *
+ * Defines the interface for caching operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+export const CACHE_PORT = 'CachePort';
+
+export interface CachePort {
+  /**
+   * Get a value from cache
+   * Returns null if key doesn't exist
+   */
+  get<T>(key: string): Promise<T | null>;
+
+  /**
+   * Set a value in cache
+   * @param key - Cache key
+   * @param value - Value to store
+   * @param ttlSeconds - Time to live in seconds (optional)
+   */
+  set<T>(key: string, value: T, ttlSeconds?: number): Promise<void>;
+
+  /**
+   * Delete a key from cache
+   */
+  delete(key: string): Promise<void>;
+
+  /**
+   * Delete multiple keys from cache
+   */
+  deleteMany(keys: string[]): Promise<void>;
+
+  /**
+   * Check if a key exists in cache
+   */
+  exists(key: string): Promise<boolean>;
+
+  /**
+   * Get time to live for a key (in seconds)
+   * Returns -2 if key doesn't exist, -1 if key has no expiration
+   */
+  ttl(key: string): Promise<number>;
+
+  /**
+   * Clear all cache entries
+   */
+  clear(): Promise<void>;
+
+  /**
+   * Get cache statistics
+   */
+  getStats(): Promise<{
+    hits: number;
+    misses: number;
+    hitRate: number;
+    keyCount: number;
+  }>;
+}
diff --git a/apps/backend/src/domain/ports/out/carrier-connector.port.ts b/apps/backend/src/domain/ports/out/carrier-connector.port.ts
new file mode 100644
index 0000000..3955c4b
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/carrier-connector.port.ts
@@ -0,0 +1,64 @@
+/**
+ * Carrier Connector Port
+ *
+ * Defines the interface for carrier API integrations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { RateQuote } from '../../entities/rate-quote.entity';
+
+export const CARRIER_CONNECTOR_PORT = 'CarrierConnectorPort';
+
+export interface CarrierRateSearchInput {
+  origin: string;
+  destination: string;
+  containerType: string;
+  departureDate: Date;
+  quantity?: number;
+  mode?: string; // 'FCL' or 'LCL'
+  weight?: number; // Weight in kg
+  volume?: number; // Volume in CBM
+  isHazmat?: boolean; // Hazardous materials flag
+  imoClass?: string; // IMO class for hazmat
+  hazardous?: boolean;
+  reefer?: boolean;
+  commodityType?: string;
+}
+
+export interface CarrierAvailabilityInput {
+  origin: string;
+  destination: string;
+  containerType: string;
+  startDate: Date;
+  endDate: Date;
+  departureDate?: Date; // Specific departure date
+  quantity?: number; // Number of containers
+}
+
+export interface CarrierConnectorPort {
+  /**
+   * Get the carrier name
+   */
+  getCarrierName(): string;
+
+  /**
+   * Get the carrier code
+   */
+  getCarrierCode(): string;
+
+  /**
+   * Search for shipping rates
+   */
+  searchRates(input: CarrierRateSearchInput): Promise<RateQuote[]>;
+
+  /**
+   * Check container availability
+   * Returns the number of available containers
+   */
+  checkAvailability(input: CarrierAvailabilityInput): Promise<number>;
+
+  /**
+   * Health check to verify carrier API is accessible
+   */
+  healthCheck(): Promise<boolean>;
+}
diff --git a/apps/backend/src/domain/ports/out/carrier.repository.ts b/apps/backend/src/domain/ports/out/carrier.repository.ts
new file mode 100644
index 0000000..b6855c7
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/carrier.repository.ts
@@ -0,0 +1,62 @@
+/**
+ * Carrier Repository Port
+ *
+ * Defines the interface for Carrier persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { Carrier } from '../../entities/carrier.entity';
+
+export const CARRIER_REPOSITORY = 'CarrierRepository';
+
+export interface CarrierRepository {
+  /**
+   * Save a carrier entity
+   */
+  save(carrier: Carrier): Promise<Carrier>;
+
+  /**
+   * Save multiple carrier entities
+   */
+  saveMany(carriers: Carrier[]): Promise<Carrier[]>;
+
+  /**
+   * Find carrier by ID
+   */
+  findById(id: string): Promise<Carrier | null>;
+
+  /**
+   * Find carrier by carrier code
+   */
+  findByCode(code: string): Promise<Carrier | null>;
+
+  /**
+   * Find carrier by SCAC (Standard Carrier Alpha Code)
+   */
+  findByScac(scac: string): Promise<Carrier | null>;
+
+  /**
+   * Find all active carriers
+   */
+  findAllActive(): Promise<Carrier[]>;
+
+  /**
+   * Find all carriers that support API integration
+   */
+  findWithApiSupport(): Promise<Carrier[]>;
+
+  /**
+   * Find all carriers (including inactive)
+   */
+  findAll(): Promise<Carrier[]>;
+
+  /**
+   * Update a carrier entity
+   */
+  update(carrier: Carrier): Promise<Carrier>;
+
+  /**
+   * Delete carrier by ID
+   */
+  deleteById(id: string): Promise<void>;
+}
diff --git a/apps/backend/src/domain/ports/out/csv-booking.repository.ts b/apps/backend/src/domain/ports/out/csv-booking.repository.ts
new file mode 100644
index 0000000..d5b7dff
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/csv-booking.repository.ts
@@ -0,0 +1,87 @@
+import { CsvBooking } from '../../entities/csv-booking.entity';
+
+/**
+ * CSV Booking Repository Port (Output Port)
+ *
+ * Interface for CSV booking persistence operations.
+ * Implemented by infrastructure layer.
+ *
+ * This port abstracts database operations from the domain layer.
+ */
+export interface CsvBookingRepositoryPort {
+  /**
+   * Create a new booking
+   * @param booking - Booking to create
+   * @returns Created booking with generated ID
+   */
+  create(booking: CsvBooking): Promise<CsvBooking>;
+
+  /**
+   * Find booking by ID
+   * @param id - Booking ID
+   * @returns Booking if found, null otherwise
+   */
+  findById(id: string): Promise<CsvBooking | null>;
+
+  /**
+   * Find booking by confirmation token
+   * @param token - Confirmation token from email link
+   * @returns Booking if found, null otherwise
+   */
+  findByToken(token: string): Promise<CsvBooking | null>;
+
+  /**
+   * Find all bookings for a user
+   * @param userId - User ID
+   * @returns Array of bookings
+   */
+  findByUserId(userId: string): Promise<CsvBooking[]>;
+
+  /**
+   * Find all bookings for an organization
+   * @param organizationId - Organization ID
+   * @returns Array of bookings
+   */
+  findByOrganizationId(organizationId: string): Promise<CsvBooking[]>;
+
+  /**
+   * Find bookings by status
+   * @param status - Booking status
+   * @returns Array of bookings with matching status
+   */
+  findByStatus(status: string): Promise<CsvBooking[]>;
+
+  /**
+   * Find pending bookings that are about to expire
+   * @param daysUntilExpiration - Number of days until expiration (e.g., 2)
+   * @returns Array of bookings expiring soon
+   */
+  findExpiringSoon(daysUntilExpiration: number): Promise<CsvBooking[]>;
+
+  /**
+   * Update existing booking
+   * @param booking - Booking with updated data
+   * @returns Updated booking
+   */
+  update(booking: CsvBooking): Promise<CsvBooking>;
+
+  /**
+   * Delete booking
+   * @param id - Booking ID
+   */
+  delete(id: string): Promise<void>;
+
+  /**
+   * Count bookings by status for a user
+   * @param userId - User ID
+   * @returns Object with counts per status
+   */
+  countByStatusForUser(userId: string): Promise<Record<string, number>>;
+
+  /**
+   * Count bookings by status for an organization
+   * @param organizationId - Organization ID
+   * @returns Object with counts per status
+   */
+  countByStatusForOrganization(organizationId: string): Promise<Record<string, number>>;
+}
diff --git a/apps/backend/src/domain/ports/out/csv-rate-loader.port.ts b/apps/backend/src/domain/ports/out/csv-rate-loader.port.ts
new file mode 100644
index 0000000..e9a691a
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/csv-rate-loader.port.ts
@@ -0,0 +1,44 @@
+import { CsvRate } from '../../entities/csv-rate.entity';
+
+/**
+ * CSV Rate Loader Port (Output Port)
+ *
+ * Interface for loading rates from CSV files.
+ * Implemented by infrastructure layer.
+ *
+ * This port abstracts CSV file operations from the domain layer.
+ */
+export interface CsvRateLoaderPort {
+  /**
+   * Load all rates from a CSV file
+   * @param filePath - Absolute or relative path to CSV file
+   * @param companyEmail - Email address for the company (stored in config metadata)
+   * @returns Array of CSV rates
+   * @throws Error if file cannot be read or parsed
+   */
+  loadRatesFromCsv(filePath: string, companyEmail: string): Promise<CsvRate[]>;
+
+  /**
+   * Load rates for a specific company
+   * @param companyName - Name of the carrier company
+   * @returns Array of CSV rates for the company
+   */
+  loadRatesByCompany(companyName: string): Promise<CsvRate[]>;
+
+  /**
+   * Validate CSV file structure without fully parsing
+   * @param filePath - Path to CSV file
+   * @returns Validation result with errors if any
+   */
+  validateCsvFile(filePath: string): Promise<{
+    valid: boolean;
+    errors: string[];
+    rowCount?: number;
+  }>;
+
+  /**
+   * Get list of all available CSV rate files
+   * @returns Array of file paths
+   */
+  getAvailableCsvFiles(): Promise<string[]>;
+}
diff --git a/apps/backend/src/domain/ports/out/email.port.ts b/apps/backend/src/domain/ports/out/email.port.ts
new file mode 100644
index 0000000..f7885e1
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/email.port.ts
@@ -0,0 +1,92 @@
+/**
+ * Email Port
+ *
+ * Defines the interface for email sending operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+export const EMAIL_PORT = 'EmailPort';
+
+export interface EmailAttachment {
+  filename: string;
+  content: Buffer | string;
+  contentType?: string;
+}
+
+export interface EmailOptions {
+  to: string | string[];
+  cc?: string | string[];
+  bcc?: string | string[];
+  replyTo?: string;
+  subject: string;
+  html?: string;
+  text?: string;
+  attachments?: EmailAttachment[];
+}
+
+export interface EmailPort {
+  /**
+   * Send an email
+   */
+  send(options: EmailOptions): Promise<void>;
+
+  /**
+   * Send booking confirmation email
+   */
+  sendBookingConfirmation(
+    email: string,
+    bookingNumber: string,
+    bookingDetails: any,
+    pdfAttachment?: Buffer
+  ): Promise<void>;
+
+  /**
+   * Send email verification email
+   */
+  sendVerificationEmail(email: string, token: string): Promise<void>;
+
+  /**
+   * Send password reset email
+   */
+  sendPasswordResetEmail(email: string, token: string): Promise<void>;
+
+  /**
+   * Send welcome email
+   */
+  sendWelcomeEmail(email: string, firstName: string): Promise<void>;
+
+  /**
+   * Send user invitation email
+   */
+  sendUserInvitation(
+    email: string,
+    organizationName: string,
+    inviterName: string,
+    tempPassword: string
+  ): Promise<void>;
+
+  /**
+   * Send CSV booking request email to carrier
+   */
+  sendCsvBookingRequest(
+    carrierEmail: string,
+    bookingDetails: {
+      bookingId: string;
+      origin: string;
+      destination: string;
+      volumeCBM: number;
+      weightKG: number;
+      palletCount: number;
+      priceUSD: number;
+      priceEUR: number;
+      primaryCurrency: string;
+      transitDays: number;
+      containerType: string;
+      documents: Array<{
+        type: string;
+        fileName: string;
+      }>;
+      confirmationToken: string;
+    }
+  ): Promise<void>;
+}
diff --git a/apps/backend/src/domain/ports/out/index.ts b/apps/backend/src/domain/ports/out/index.ts
new file mode 100644
index 0000000..2f50b35
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/index.ts
@@ -0,0 +1,25 @@
+/**
+ * Domain Ports (Output) - Barrel Export
+ *
+ * Exports all output port interfaces and tokens for easy importing.
+ */
+
+// Repository Ports
+export * from './user.repository';
+export * from './booking.repository';
+export * from './rate-quote.repository';
+export * from './organization.repository';
+export * from './port.repository';
+export * from './carrier.repository';
+export * from './notification.repository';
+export * from './audit-log.repository';
+export * from './webhook.repository';
+export * from './csv-booking.repository';
+
+// Infrastructure Ports
+export * from './cache.port';
+export * from './email.port';
+export * from './pdf.port';
+export * from './storage.port';
+export * from './carrier-connector.port';
+export * from './csv-rate-loader.port';
diff --git a/apps/backend/src/domain/ports/out/notification.repository.ts b/apps/backend/src/domain/ports/out/notification.repository.ts
new file mode 100644
index 0000000..24ad7fe
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/notification.repository.ts
@@ -0,0 +1,80 @@
+/**
+ * Notification Repository Port
+ *
+ * Defines the interface for Notification persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { Notification } from '../../entities/notification.entity';
+
+export const NOTIFICATION_REPOSITORY = 'NotificationRepository';
+
+export interface NotificationFilters {
+  userId?: string;
+  organizationId?: string;
+  type?: string[];
+  read?: boolean;
+  priority?: string[];
+  startDate?: Date;
+  endDate?: Date;
+  offset?: number;
+  limit?: number;
+}
+
+export interface NotificationRepository {
+  /**
+   * Save a notification entity
+   */
+  save(notification: Notification): Promise<void>;
+
+  /**
+   * Find notification by ID
+   */
+  findById(id: string): Promise<Notification | null>;
+
+  /**
+   * Find notifications by filters
+   */
+  findByFilters(filters: NotificationFilters): Promise<Notification[]>;
+
+  /**
+   * Count notifications matching filters
+   */
+  count(filters: NotificationFilters): Promise<number>;
+
+  /**
+   * Find unread notifications for a user
+   */
+  findUnreadByUser(userId: string, limit?: number): Promise<Notification[]>;
+
+  /**
+   * Count unread notifications for a user
+   */
+  countUnreadByUser(userId: string): Promise<number>;
+
+  /**
+   * Find recent notifications for a user
+   */
+  findRecentByUser(userId: string, limit?: number): Promise<Notification[]>;
+
+  /**
+   * Mark a notification as read
+   */
+  markAsRead(id: string): Promise<void>;
+
+  /**
+   * Mark all notifications as read for a user
+   */
+  markAllAsReadForUser(userId: string): Promise<void>;
+
+  /**
+   * Delete a notification
+   */
+  delete(id: string): Promise<void>;
+
+  /**
+   * Delete old read notifications
+   * Returns the number of deleted records
+   */
+  deleteOldReadNotifications(olderThanDays: number): Promise<number>;
+}
diff --git a/apps/backend/src/domain/ports/out/organization.repository.ts b/apps/backend/src/domain/ports/out/organization.repository.ts
new file mode 100644
index 0000000..b7a48b4
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/organization.repository.ts
@@ -0,0 +1,62 @@
+/**
+ * Organization Repository Port
+ *
+ * Defines the interface for Organization persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { Organization } from '../../entities/organization.entity';
+
+export const ORGANIZATION_REPOSITORY = 'OrganizationRepository';
+
+export interface OrganizationRepository {
+  /**
+   * Save an organization entity
+   */
+  save(organization: Organization): Promise<Organization>;
+
+  /**
+   * Find organization by ID
+   */
+  findById(id: string): Promise<Organization | null>;
+
+  /**
+   * Find organization by name
+   */
+  findByName(name: string): Promise<Organization | null>;
+
+  /**
+   * Find organization by SCAC (Standard Carrier Alpha Code)
+   */
+  findBySCAC(scac: string): Promise<Organization | null>;
+
+  /**
+   * Find all organizations
+   */
+  findAll(): Promise<Organization[]>;
+
+  /**
+   * Find all active organizations
+   */
+  findAllActive(): Promise<Organization[]>;
+
+  /**
+   * Find organizations by type (e.g., 'FREIGHT_FORWARDER', 'CARRIER')
+   */
+  findByType(type: string): Promise<Organization[]>;
+
+  /**
+   * Update an organization entity
+   */
+  update(organization: Organization): Promise<Organization>;
+
+  /**
+   * Delete organization by ID
+   */
+  deleteById(id: string): Promise<void>;
+
+  /**
+   * Count total organizations
+   */
+  count(): Promise<number>;
+}
diff --git a/apps/backend/src/domain/ports/out/pdf.port.ts b/apps/backend/src/domain/ports/out/pdf.port.ts
new file mode 100644
index 0000000..48ef315
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/pdf.port.ts
@@ -0,0 +1,66 @@
+/**
+ * PDF Port
+ *
+ * Defines the interface for PDF generation operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+export const PDF_PORT = 'PdfPort';
+
+export interface BookingPdfData {
+  bookingNumber: string;
+  bookingDate: Date;
+  origin: {
+    code: string;
+    name: string;
+  };
+  destination: {
+    code: string;
+    name: string;
+  };
+  carrier: {
+    name: string;
+    logo?: string;
+  };
+  etd: Date;
+  eta: Date;
+  transitDays: number;
+  shipper: {
+    name: string;
+    address: string;
+    contact: string;
+    email: string;
+    phone: string;
+  };
+  consignee: {
+    name: string;
+    address: string;
+    contact: string;
+    email: string;
+    phone: string;
+  };
+  containers: Array<{
+    type: string;
+    quantity: number;
+    containerNumber?: string;
+    sealNumber?: string;
+  }>;
+  cargoDescription: string;
+  specialInstructions?: string;
+  price: {
+    amount: number;
+    currency: string;
+  };
+}
+
+export interface PdfPort {
+  /**
+   * Generate booking confirmation PDF
+   */
+  generateBookingConfirmation(data: BookingPdfData): Promise<Buffer>;
+
+  /**
+   * Generate rate quote comparison PDF
+   */
+  generateRateQuoteComparison(quotes: any[]): Promise<Buffer>;
+}
diff --git a/apps/backend/src/domain/ports/out/port.repository.ts b/apps/backend/src/domain/ports/out/port.repository.ts
new file mode 100644
index 0000000..40ba3f5
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/port.repository.ts
@@ -0,0 +1,58 @@
+/**
+ * Port Repository Port
+ *
+ * Defines the interface for Port (maritime port) persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { Port } from '../../entities/port.entity';
+
+export const PORT_REPOSITORY = 'PortRepository';
+
+export interface PortRepository {
+  /**
+   * Save a port entity
+   */
+  save(port: Port): Promise<Port>;
+
+  /**
+   * Save multiple port entities
+   */
+  saveMany(ports: Port[]): Promise<Port[]>;
+
+  /**
+   * Find port by UN LOCODE
+   */
+  findByCode(code: string): Promise<Port | null>;
+
+  /**
+   * Find multiple ports by codes
+   */
+  findByCodes(codes: string[]): Promise<Port[]>;
+
+  /**
+   * Search ports by query string (name, city, or code)
+   * with optional country filter and limit
+   */
+  search(query: string, limit?: number, countryFilter?: string): Promise<Port[]>;
+
+  /**
+   * Find all active ports
+   */
+  findAllActive(): Promise<Port[]>;
+
+  /**
+   * Find all ports in a specific country
+   */
+  findByCountry(countryCode: string): Promise<Port[]>;
+
+  /**
+   * Count total ports
+   */
+  count(): Promise<number>;
+
+  /**
+   * Delete port by code
+   */
+  deleteByCode(code: string): Promise<void>;
+}
diff --git a/apps/backend/src/domain/ports/out/rate-quote.repository.ts b/apps/backend/src/domain/ports/out/rate-quote.repository.ts
new file mode 100644
index 0000000..d53f3a1
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/rate-quote.repository.ts
@@ -0,0 +1,53 @@
+/**
+ * RateQuote Repository Port
+ *
+ * Defines the interface for RateQuote persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { RateQuote } from '../../entities/rate-quote.entity';
+
+export const RATE_QUOTE_REPOSITORY = 'RateQuoteRepository';
+
+export interface RateQuoteRepository {
+  /**
+   * Save a rate quote entity
+   */
+  save(rateQuote: RateQuote): Promise<RateQuote>;
+
+  /**
+   * Save multiple rate quote entities
+   */
+  saveMany(rateQuotes: RateQuote[]): Promise<RateQuote[]>;
+
+  /**
+   * Find rate quote by ID
+   */
+  findById(id: string): Promise<RateQuote | null>;
+
+  /**
+   * Find rate quotes by search criteria
+   */
+  findBySearchCriteria(criteria: {
+    origin: string;
+    destination: string;
+    containerType: string;
+    departureDate: Date;
+  }): Promise<RateQuote[]>;
+
+  /**
+   * Find all rate quotes for a specific carrier
+   */
+  findByCarrier(carrierId: string): Promise<RateQuote[]>;
+
+  /**
+   * Delete expired rate quotes
+   * Returns the number of deleted records
+   */
+  deleteExpired(): Promise<number>;
+
+  /**
+   * Delete rate quote by ID
+   */
+  deleteById(id: string): Promise<void>;
+}
diff --git a/apps/backend/src/domain/ports/out/storage.port.ts b/apps/backend/src/domain/ports/out/storage.port.ts
new file mode 100644
index 0000000..75d13a0
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/storage.port.ts
@@ -0,0 +1,69 @@
+/**
+ * Storage Port
+ *
+ * Defines the interface for object storage operations (S3, MinIO, etc.).
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+export const STORAGE_PORT = 'StoragePort';
+
+export interface UploadOptions {
+  bucket: string;
+  key: string;
+  body: Buffer | string;
+  contentType?: string;
+  metadata?: Record<string, string>;
+  acl?: string;
+}
+
+export interface DownloadOptions {
+  bucket: string;
+  key: string;
+}
+
+export interface DeleteOptions {
+  bucket: string;
+  key: string;
+}
+
+export interface StorageObject {
+  key: string;
+  url: string;
+  size: number;
+  contentType?: string;
+  lastModified?: Date;
+}
+
+export interface StoragePort {
+  /**
+   * Upload a file to storage
+   */
+  upload(options: UploadOptions): Promise<StorageObject>;
+
+  /**
+   * Download a file from storage
+   */
+  download(options: DownloadOptions): Promise<Buffer>;
+
+  /**
+   * Delete a file from storage
+   */
+  delete(options: DeleteOptions): Promise<void>;
+
+  /**
+   * Get a signed URL for temporary access
+   * @param options - Download options
+   * @param expiresIn - URL expiration in seconds (default: 3600)
+   */
+  getSignedUrl(options: DownloadOptions, expiresIn?: number): Promise<string>;
+
+  /**
+   * Check if a file exists in storage
+   */
+  exists(options: DownloadOptions): Promise<boolean>;
+
+  /**
+   * List objects in a bucket
+   */
+  list(bucket: string, prefix?: string): Promise<StorageObject[]>;
+}
diff --git a/apps/backend/src/domain/ports/out/user.repository.ts b/apps/backend/src/domain/ports/out/user.repository.ts
new file mode 100644
index 0000000..15499e8
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/user.repository.ts
@@ -0,0 +1,62 @@
+/**
+ * User Repository Port
+ *
+ * Defines the interface for User persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { User } from '../../entities/user.entity';
+
+export const USER_REPOSITORY = 'UserRepository';
+
+export interface UserRepository {
+  /**
+   * Save a user entity
+   */
+  save(user: User): Promise<User>;
+
+  /**
+   * Find user by ID
+   */
+  findById(id: string): Promise<User | null>;
+
+  /**
+   * Find user by email address
+   */
+  findByEmail(email: string): Promise<User | null>;
+
+  /**
+   * Find all users belonging to an organization
+   */
+  findByOrganization(organizationId: string): Promise<User[]>;
+
+  /**
+   * Find all users with a specific role
+   */
+  findByRole(role: string): Promise<User[]>;
+
+  /**
+   * Find all active users
+   */
+  findAllActive(): Promise<User[]>;
+
+  /**
+   * Update a user entity
+   */
+  update(user: User): Promise<User>;
+
+  /**
+   * Delete user by ID
+   */
+  deleteById(id: string): Promise<void>;
+
+  /**
+   * Count users in an organization
+   */
+  countByOrganization(organizationId: string): Promise<number>;
+
+  /**
+   * Check if email exists
+   */
+  emailExists(email: string): Promise<boolean>;
+}
diff --git a/apps/backend/src/domain/ports/out/webhook.repository.ts b/apps/backend/src/domain/ports/out/webhook.repository.ts
new file mode 100644
index 0000000..38097ce
--- /dev/null
+++ b/apps/backend/src/domain/ports/out/webhook.repository.ts
@@ -0,0 +1,53 @@
+/**
+ * Webhook Repository Port
+ *
+ * Defines the interface for Webhook persistence operations.
+ * This is a secondary port (output port) in hexagonal architecture.
+ */
+
+import { Webhook, WebhookEvent } from '../../entities/webhook.entity';
+
+export const WEBHOOK_REPOSITORY = 'WebhookRepository';
+
+export interface WebhookFilters {
+  organizationId?: string;
+  status?: string[];
+  event?: WebhookEvent;
+}
+
+export interface WebhookRepository {
+  /**
+   * Save a webhook entity
+   */
+  save(webhook: Webhook): Promise<void>;
+
+  /**
+   * Find webhook by ID
+   */
+  findById(id: string): Promise<Webhook | null>;
+
+  /**
+   * Find all webhooks for an organization
+   */
+  findByOrganization(organizationId: string): Promise<Webhook[]>;
+
+  /**
+   * Find active webhooks by event and organization
+   */
+  findActiveByEvent(event: WebhookEvent, organizationId: string): Promise<Webhook[]>;
+
+  /**
+   * Find webhooks by filters
+   */
+  findByFilters(filters: WebhookFilters): Promise<Webhook[]>;
+
+  /**
+   * Delete a webhook
+   */
+  delete(id: string): Promise<void>;
+
+  /**
+   * Count webhooks for an organization
+   */
+  countByOrganization(organizationId: string): Promise<number>;
+}