DoorDash rebuilt its Dasher onboarding system from a fragmented, country-specific legacy architecture into a unified, composable workflow platform. The new design uses reusable step modules that each encapsulate their own business logic, validation, and failure handling, orchestrated by a centralized engine driven by declarative workflow definitions. A unified status map replaces scattered persistence layers as the single source of truth for applicant progress. The US flow migrated in January 2025, followed by Australia, Canada, Puerto Rico, and New Zealand, with no reported regressions. Key design principles included composable steps, clear interface contracts, module ownership, and backward compatibility, enabling faster market launches and reduced engineering overhead.
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