You have been tasked with planning the migration of your company's application from on- premises to Google Cloud. Your company's monolithic application is an ecommerce website. The application will be

Question

Options

• AMigrate the Product catalog, which has integrations to the frontend and product database.
• BMigrate Payment processing, which has integrations to the frontend, order database, and third-
• CMigrate Order fulfillment, which has integrations to the order database, inventory system, and
• DMigrate the Shopping cart, which has integrations to the frontend, cart database, inventory

• A
  83% (30)
• B
  8% (3)
• C
  6% (2)
• D
  3% (1)

Explanation

When migrating a revenue-critical ecommerce application in stages, the guiding principle is to start with the component that has the fewest external dependencies and lowest business risk. The Product catalog is a largely read-only, display service with simple integrations (frontend + product database). A failure in the product catalog is visible but not immediately revenue-blocking (users can't browse but existing carts still work). This makes it the safest first migration candidate. Payment processing (B) is extremely high-risk-it integrates with third parties and directly handles revenue; a failure here causes immediate financial loss. Order fulfillment (C) has complex integrations with inventory and shipping systems. Shopping cart (D) is deeply intertwined with frontend, inventory, and cart database. Both C and D have more dependencies and higher risk than the catalog. Migrating the simplest component first validates the migration process with minimal risk.

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