CallidusOS — Multi-Tenant Clinic SaaS
Dusko Licanin
CallidusOS dashboard
Approve result
What it is
Multi-tenant SaaS that gives UK aesthetic clinics one source of truth for scheduling, patient records, and billing — replacing disconnected spreadsheets and legacy desktop tools.
What I built
Solo build over 10 weeks, ~1,887 commits. Each clinic (tenant) gets isolated data, staff roles, and per-clinic configuration from a single codebase.
Multi-tenant architecture with full data isolation per clinic
Role-based access control (admin, practitioner, receptionist)
Appointment scheduling with calendar views
Patient record management with treatment history
Invoicing and billing per clinic
100+ Cloud Functions powering backend logic
Scheduling & appointments
Appointment drawer
Booking pending state
Patient records & clinical data
Patient clinical view
Approve result detail
Invoicing & billing
Invoices dark mode
Supplier management
Supplier detail
Multi-step flows & comparison views
Back step 2
Comparison view
Edge cases & polish
Empty state
5 attempts validation
Stack
React, TypeScript, Firebase (Auth, Firestore, Cloud Functions), multi-tenant data isolation, RBAC.
Demo
Result
Live with UK clinics — scheduling, records, and invoicing run in one web app instead of four separate tools.
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Posted Jul 1, 2026
Multi-tenant SaaS replacing spreadsheets and legacy tools for UK aesthetic clinics — scheduling, patient records, invoicing, RBAC. Solo 10-week build.
