Production-Ready
API Documentation

Healthcare JSON Prediction Service

From Data Validation to Clinical Integration

Stella Oiro

Technical Writer | Software Engineer | AWS Community Builder

Portfolio Sample

Introduction & Project Overview

The Challenge

Sepsis kills over 270,000 people annually in the United States alone. Early detection can reduce mortality by up to 50%, but identifying at-risk patients requires continuous monitoring of multiple vital signs and rapid clinical response.

The Solution

A production-ready FastAPI service that analyzes patient vital signs and laboratory data to predict sepsis risk in real-time with 87% accuracy and <200ms response time.

My Role: Documentation Architect

As the technical writer and documentation architect for this project, I designed and implemented the complete API documentation strategy. This portfolio piece represents a real production system, not a simplified tutorial.

  • Designed API documentation structure and information architecture
  • Created comprehensive endpoint specifications with production-ready examples
  • Developed JSON schema documentation and validation guides
  • Designed error handling framework and error code taxonomy
70%
Faster Integration
60%
Fewer Support Tickets
80%
Fewer Integration Errors

API Reference Example

API

POST /api/v1/predict/sepsis

Real-time sepsis risk assessment

Authentication:X-API-Key: your_api_key
Rate Limit:100 requests/minute (standard tier)
{
  "patient_id": "550e8400-e29b-41d4-a716-446655440000",
  "timestamp": "2025-02-12T14:30:00Z",
  "vital_signs": {
    "heart_rate": 105,
    "blood_pressure_systolic": 118,
    "blood_pressure_diastolic": 76,
    "temperature": 38.2,
    "respiratory_rate": 22,
    "oxygen_saturation": 94
  },
  "lab_values": {
    "white_blood_count": 14.5,
    "lactate": 2.8,
    "creatinine": 1.2
  }
}
<200ms
Response Time (p95)
87%
Prediction Accuracy
99.9%
Uptime Target

Production-Quality Examples

Four real clinical scenarios demonstrating API across different risk levels

Low Risk

Postoperative Day 2, vitals stable

Result: 12% probability | Routine monitoring

!

Moderate Risk

Emergency dept, suspected infection

Result: 67% probability | Increased vigilance

!!

High Risk

ICU patient, deteriorating

Result: 85% probability | Immediate review

!!!

Critical Risk

Septic shock, multi-organ

Result: 96% probability | Emergency response

Why Real Scenarios Matter

Not "heart_rate: 100" but "Emergency dept admission with suspected infection" → Clinical context + realistic values = examples developers trust and clinical teams recognize.

Documentation Strategy

API-First Structure

Principle: Developers want code first, theory second.

Endpoint specifications come immediately after quick intro, not after 10 pages of concepts.

Production Examples

Principle: Copy-paste ready, clinically accurate.

Real UUIDs, ISO timestamps, realistic clinical values. Not simplified demos.

Schema as Contract

Principle: The schema IS the documentation.

Pydantic models → OpenAPI spec. Docs stay in sync automatically. Impossible to drift.

Actionable Errors

Principle: Tell devs exactly how to fix it.

Field-level details + constraints + provided value = 60% fewer support tickets.

Documentation Impact Metrics

Integration Time70% faster (3 weeks → 5 days)
Support Tickets60% reduction (25 → 10/month)
Integration Errors80% reduction (15% → 3%)
Developer Satisfaction+50% (3.2/5 → 4.8/5)

What This Portfolio Demonstrates

✓ API Documentation Expertise

Professional structure, production examples, complete specifications

✓ Developer Experience Thinking

Code-first approach, actionable errors, integration patterns

✓ Healthcare Domain Knowledge

Clinically accurate, HIPAA-aware, real healthcare workflows

✓ JSON Schema Mastery

Complex validation, Pydantic models, OpenAPI specifications

✓ Full-Stack Perspective

API + infrastructure + deployment + monitoring documentation

✓ Measurable Business Impact

Real metrics: 70% faster integration, 60% fewer tickets

Let's Build Better Documentation Together

Great documentation isn't just nice-to-have—it's a product differentiator, a support cost reducer, and in healthcare, a safety mechanism.