Developer Details GraphQL and CQRS Architecture Used in Production EMR System

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Software developer Erwin Wilson Ceniza published a technical deep dive on July 2, 2026, detailing the GraphQL architecture powering a production electronic medical records system. The system uses HotChocolate's code-first approach to serve three separate portals from a single unified schema. Key architectural decisions include BatchDataLoaders to prevent N+1 query problems and a CQRS pattern combined with a transactional outbox for handling mutations reliably. Security is enforced at the resolver level through custom middleware attributes, while Apollo Federation is employed to future-proof the graph for scalability. The article also covers GraphQL client implementation on mobile using Ionic, sharing query logic across all three portals.

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