Fitness SaaS backend for authentication, subscriptions, workout management, equipment data, user preferences, role permissions, and AI-assisted fitness features.
A scalable fitness-focused SaaS backend built to support members, coaches, and admins with secure account access, subscription workflows, workout planning, equipment management, fitness preferences, analytics, and AI-assisted feature expansion.
A backend-first summary of the product problem and the solution direction behind the full project delivery.
A scalable fitness-focused SaaS backend built to support members, coaches, and admins with secure account access, subscription workflows, workout planning, equipment management, fitness preferences, analytics, and AI-assisted feature expansion.
The platform needed a reliable backend foundation for fitness users, paid subscriptions, role-based access, workout data, equipment workflows, user preferences, and future AI-assisted features such as equipment detection and smart workout support.
I built a modular FastAPI backend with secure JWT authentication, RBAC permissions, subscription-ready workflows, structured workout and equipment APIs, Redis-backed OTP and caching, background processing, and deployment automation using Docker, Nginx, and CI/CD.
A single system architecture snapshot preserved as proof of the delivery design and implementation flow.
The stack used across the full build, covering service logic, data storage, infrastructure, cloud setup, frontend integration points, and delivery tooling.
The core capabilities were implemented as production-facing modules, shaped for real usage, maintainability, and future scale.
Feature 01
Secure JWT-based login, refresh tokens, password handling, and protected API access.
Feature 02
Permission-aware access for members, coaches, admins, and operational users.
Feature 03
Redis-backed OTP flows with expiration, cooldowns, and abuse prevention.
Feature 04
Subscription-ready backend workflows for paid fitness plans, access control, and billing states.
Feature 05
Structured APIs for workout plans, exercises, sets, reps, rest periods, and training workflows.
Feature 06
Admin-managed equipment categories, groups, usage instructions, images, banners, and videos.
Feature 07
Profile preference support for weight, distance, and measurement units such as KG/LBS, KM/MILE, and CM/INCH.
Feature 08
Backend foundation for AI-driven equipment detection, smart recommendations, and fitness workflow automation.
Feature 09
Backend metrics for users, subscriptions, workout activity, equipment usage, and platform performance.
Feature 10
Scalable list endpoints for users, workouts, equipment, subscriptions, and admin records.
Feature 11
Centralized backend controls for users, plans, equipment, workouts, permissions, and activity monitoring.
The main engineering tradeoffs handled during delivery instead of being deferred into post-launch cleanup.
Production Tradeoff
Production Tradeoff
Production Tradeoff
Production Tradeoff
Production Tradeoff
Production Tradeoff
Optimized the backend for faster response times, steadier throughput, and more predictable behavior under production traffic.
Applied practical safeguards across authentication, validation, permissions, and transport security to protect the platform in production.
Releases stay repeatable through a clear path from source control to health-checked production deployment.
Representative product surfaces supported by the APIs, workflows, and operational foundations built for the project.
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FastAPI • Python • REST APIs • JWT Authentication • Async API Design • VPS Hosting • Linux Server • Domain & Reverse Proxy Setup • SQL Database • Tortoise ORM • Aerich Migrations • Redis • Next.js Storefront • Next.js Admin Dashboard • Docker • Docker Compose • Nginx • VPS Deployment • Steadfast Delivery API • Payment Workflow • Email / OTP Ready Flow • Git • GitHub Actions • Postman • Swagger/OpenAPI
Open project