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EHR Prescription Service

A high-uptime prescription and clinical-note service for an EHR platform, with a REST layer tuned for fast mobile clients and strict data-access controls.

  • Django
  • PostgreSQL
  • FHIR R4
  • REST
Source

title: EHR Prescription Service summary: A high-uptime prescription and clinical-note service for an EHR platform, with a REST layer tuned for fast mobile clients and strict data-access controls. stack: ["Django", "PostgreSQL", "FHIR R4", "REST"] links: repo: https://github.com/your-handle/ehr-prescription-service featured: true order: 3

The problem

A monolithic patient-record service coupled five downstream consumers behind shared state, and slow queries pushed API responses well past what mobile clients could tolerate. In a clinical setting, a sluggish or flaky prescription flow is not a cosmetic issue.

The approach

I decoupled the downstream consumers behind a message queue so they no longer contended on the same records, then profiled and tuned the PostgreSQL indexes and queries behind the hottest endpoints. Adopting FHIR R4 made patient data interoperable with partner systems instead of locked into a bespoke shape.

The discipline here was correctness first: every change had to preserve audit trails and access controls, so optimizations were validated against the same compliance constraints they shipped under.

The outcome

  • Average API response brought from ~420ms to ~95ms
  • Processed 2M+ monthly prescriptions at a 99.9% uptime SLA
  • Patient data interoperable across partner hospital networks via FHIR R4