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SaaS web platformFitness
DailyFit
Visit siteMulti-tenant gym management SaaS: a standalone Express and TypeScript API with 183 endpoints behind a 63-page Next.js app, covering members, classes, staff and billing.
Re-architected from a Next.js monolith into a separate Express and TypeScript API, with Prisma on PostgreSQL, Zod validation, NextAuth and OAuth, structured Pino logging, and Docker and nginx for deployment. Includes a six-module finance suite, a scheduling-conflict engine, a three-tier access hierarchy across nine roles, and about 48 documents with a prioritised technical-debt register.
Highlights
- Re-architected a Next.js monolith into a standalone Express and TypeScript API with 183 endpoints, reaching a production build in 11 days and full deployment readiness in 26 days.
- Engineered a finance suite with 6 modules and 43 endpoints, including idempotent automation that eliminates 12 manual entries per rule annually.
- Secured the API with rate limiting of 5 logins per 15 minutes, Zod validation and OAuth, alongside a 3-tier access hierarchy across 9 roles.
- Implemented a scheduling-conflict engine that checks 5 conflict types, preventing double-booked trainers and rooms.
- Refactored the Next.js frontend (63 pages) with 9 shared UI components, moving 943 lines out of one page into 4 modals.
- Documented the platform in about 48 docs (about 21K lines) with a prioritised technical-debt register.