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SAAS
Physio Xpert - Medical Platform for Physiotherapists
Full-stack medical platform developed for physiotherapists, featuring a microservices architecture (5 services), a Next.js admin dashboard and a React mobile application. The system integrates intelligent questionnaires with JSONLogic rules engine, medical flags system (red flags), and a personalized exercise recommendation algorithm based on the V/O/R protocol (Green/Orange/Red).
Features
Microservices architecture with API Gateway
Complete admin dashboard (Next.js 16)
Mobile patient application (React + Vite)
Intelligent questionnaires with JSONLogic
Medical flags system (red/yellow flags)
V/O/R algorithm for exercise progression
GDPR compliance (encryption, soft delete, audit)
Questionnaire versioning system
The Challenge
Develop a complete medical platform requiring a scalable architecture with 5 distinct microservices (Gateway, Core, Questionnaire, Rehab, Eval), while ensuring GDPR compliance with patient data encryption. The system needed to integrate a JSONLogic rules engine for dynamic questionnaires triggering medical flags, as well as an exercise progression algorithm based on patient feedback (V/O/R). Everything had to be maintainable long-term with ~190,000 lines of TypeScript.
Microservices architecture
Design 5 decoupled services with API Gateway, JWT authentication and intelligent routing
GDPR Compliance
Implement patient data encryption, soft delete, audit logs and consent management
JSONLogic rules engine
Develop a dynamic questionnaire system with conditional rules and flag calculation
Dual user interface
Create a complete admin dashboard and an intuitive mobile patient application
The Solution
Microservices architecture with Fastify and Drizzle ORM for a performant and type-safe API. Next.js 16 dashboard with Base UI for a modern admin interface. React mobile application with Vite for optimal patient experience. JSONLogic engine for questionnaire rules with real-time flag calculation. V/O/R system to automatically adapt exercise difficulty based on patient tolerance. PostgreSQL encryption (pgp_sym_encrypt) and soft delete for GDPR compliance.
API Gateway
:3010 Gateway
JWT Auth + Routing
:3011 Core
Patients, Users
:3012 Quest
Questionnaires, Rules
:3013 Rehab
Exercises, Sessions
:3014 Eval
Evaluations, Results
Tech Stack
Backend
FastifyDrizzle ORMPostgreSQLJWT Auth
Dashboard (Admin)
Next.js 16Base UITailwind CSS v4
Mobile (Patient)
React 19Vite 7React Router v7
DevOps
ScalingoGitHub ActionsPlaywright E2E
Results
190k
Lines of code
TypeScript
5
API Services
Microservices architecture
227
Components
Dashboard + Mobile
188
E2E Tests
Full coverage
GDPR
Compliance
Encryption + Audit
1
Developer
Solo project
Administration interface for managing patients and questionnaires
1 / 3
Lessons Learned
Solo microservices architecture
TechnicalManaging 5 distinct services requires rigorous discipline on API contracts and shared dependency management
Drizzle ORM and PostgreSQL
TechnicalDrizzle offers an excellent balance between type-safety and flexibility, with simple migrations to manage
Base UI vs Radix
TechnicalBase UI offers more flexibility than shadcn/Radix with the render pattern, but requires more initial configuration
JSONLogic for business rules
DesignJSONLogic allows storing complex rules in database, making the system extensible without deployment
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