ACTIVE
FastAPI
ENGINE SPEC
High Perf API
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KINNIKUAPP
KINNIKU APP
FastAPISQLModelSaaS ArchitectureQR-Core
TECHNICAL SUMMARY
A comprehensive SaaS platform for gym owners. Built with FastAPI and PostgreSQL, it handles multi-tenant data isolation with absolute security. Gyms can manage members, automate payments, and track attendance via a high-performance QR check-in system.
KEY CAPABILITIES
Multi-tenant Data Isolation
QR Attendance & Member Control
Automated Payment Workflows
White-label Gym Branding
ENGINE_SPECIFICATIONS
SQL
ACTIVE
SQLModel
ENGINE SPEC
ORM / Types
TS
ACTIVE
SaaS Architecture
ENGINE SPEC
Tech Stack
TS
ACTIVE
QR-Core
ENGINE SPEC
Tech Stack
ENGINEERING_DECISIONS
PROBLEM ▸Many gyms on one platform — one tenant's data must never leak into another's.
DECISION ▸Strict multi-tenant isolation enforced at the data layer in FastAPI + PostgreSQL.
PROBLEM ▸Front-desk attendance control has to be faster than a paper list.
DECISION ▸QR check-in flow validated server-side against the member's subscription.
PROBLEM ▸Each gym wants the app to look like their own brand.
DECISION ▸White-label theming resolved per tenant at runtime.
CHALLENGE
Strict data isolation & dynamic branding for multi-tenant scaling.
IMPACT
Scalable SaaS infrastructure ready for commercial multi-gym rollout.