Answer-first: An enterprise Magento project in Vietnam distributes real-world effort across 4 tiers: Storefront UI (15-25%), Backend Business Logic (25-35%), ERP/WMS System Integration (25-40%), and Production Operations (10-20%). The leading cause of budget overrun is underestimating the domestic systems integration tier. Enterprises should run a Paid Discovery Phase, build an integration matrix with idempotency guarantees, and calculate a 3-year Total Cost of Ownership (TCO) before signing any Fixed-Price contract.
Explore the full architectural migration handbook in the Magento Migration Vietnam Series.
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