FreshCart is a high-traffic online grocery delivery service. As the platform scaled, the initial MongoDB database structure led to serious data inconsistency issues, missing relationships, and slow complex queries. The frontend codebase, written in un-typed JavaScript, suffered from frequent runtime bugs and slow rendering speeds.
The main challenges were three-fold: first, migrating hundreds of thousands of documents from MongoDB to PostgreSQL without causing service downtime; second, refactoring a massive legacy JavaScript codebase into strict TypeScript to prevent runtime type errors; and third, optimizing frontend bundle sizes to improve load times for users on low-bandwidth mobile connections.
We designed and executed a phased migration database strategy using structured PostgreSQL schemas with strict foreign key constraints. We completely refactored the backend controllers and utility functions into TypeScript. On the frontend, we migrated to a modern Next.js structure and optimized asset loading.
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