Telemedicine Architecture Notes

High-level architecture blueprint for modern telemedicine platforms.

Covers the full operational flow:

intake → eligibility → voucher → provider → prescription → pharmacy → fulfillment

Designed to demonstrate backend systems thinking, API orchestration, and healthcare-compliant architecture patterns.

---

🧭 End-to-End System Flow

flowchart LR
  A["Patient Intake Form"] --> B["Eligibility Service"]
  B --> C["Voucher API"]
  C --> D["Provider Assignment"]
  D --> E["Prescription Service"]
  E --> F["Pharmacy API"]
  F --> G["Order Fulfillment"]
  G --> H["Tracking & Notifications"]

Loading

---

🔌 Typical API Surface

Patient & Intake

• POST /patients
• POST /intake
• GET /patients/{id}
• GET /cases/{id}

Eligibility

• POST /eligibility/check
• GET /eligibility/{case_id}

Voucher

• POST /vouchers
• GET /vouchers/{id}
• POST /vouchers/{id}/invalidate

Provider

• POST /cases/assign-provider
• GET /providers/{id}

Prescription

• POST /prescriptions
• GET /prescriptions/{id}
• POST /prescriptions/{id}/cancel

Pharmacy

• POST /orders
• GET /orders/{id}
• POST /orders/{id}/cancel
• POST /orders/{id}/resend

---

🔐 Security Checklist

• ✅ Token-based authentication (JWT or API keys)
• ✅ Role-based access control (RBAC)
• ✅ Webhook signature validation (HMAC SHA-256)
• ✅ Idempotency keys for order creation
• ✅ Rate limiting and abuse protection
• ✅ Structured audit logging
• ✅ PHI encryption at rest
• ✅ TLS enforced for all endpoints
• ✅ Access logs with correlation IDs
• ✅ Background job isolation for pharmacy calls

---

🏗 Recommended Architecture Pattern

• Event-driven design
• Message queue between prescription and pharmacy services
• Centralized logging service
• Distributed tracing (correlation IDs)
• Retry strategy with exponential backoff
• Circuit breaker for external pharmacy APIs

---

⚠️ Common Pitfalls

1️⃣ Idempotency Failures

Duplicate voucher or prescription creation due to webhook retries.

2️⃣ Race Conditions

Eligibility approved but provider not yet assigned.

3️⃣ Webhook Delivery Delays

Pharmacy webhook arrives late or duplicated.

4️⃣ Retry Storms

External API retries without exponential backoff.

5️⃣ Partial Order States

Prescription created but pharmacy order failed.

6️⃣ Missing Audit Trail

No traceability for regulatory review.

---

📊 Observability Strategy

• Structured JSON logs
• Centralized log aggregation
• Metrics for:
  • Voucher generation rate
  • Prescription latency
  • Pharmacy API failures
• Alerting on failure thresholds

---

📁 Suggested Modular Structure

telemedicine-platform/
├─ intake-service/
├─ eligibility-service/
├─ voucher-service/
├─ provider-service/
├─ prescription-service/
├─ pharmacy-integration/
├─ notification-service/
└─ shared-auth-library/

---

🧠 Design Goals

• Decoupled services
• Clear auditability
• Resilience to external API failures
• Regulatory compliance readiness
• Scalable multi-tenant architecture

---

📬 Author

Rober Lopez
Backend & API Integration Specialist · Automation · Healthcare Integrations

• 🌐 Website: https://roberlopez.com
• 💻 GitHub: https://github.com/kirito18
• 🔗 LinkedIn: https://www.linkedin.com/in/web-rober-lopez/