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Case Study
In-house product · Ongoing developmentSimpleTraining — Fitness SaaS Platform
A workout programming SaaS built for personal trainers and their clients
Next.jsTypeScriptSaaSTailwind CSSPostgreSQLPrisma
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Industry
Fitness / SaaS
Project Type
Custom SaaS System
Tech Stack
Next.jsTypeScriptPostgreSQLPrismaTailwind CSS
Scope of Work
Product planningUI/UX designFull-stack developmentDatabase designPayment integrationAdmin dashboard
Screens
Screens from the live site
DesktopSimpleTraining platform homepage with the product positioning and trainer sign-up entry point 
DesktopFeature section showing programme management, training logs, and progress tracking 
MobileMobile interface: the main entry points trainers and clients use on a phone
Overview
Overview
SimpleTraining is a SaaS product we built independently from the ground up, designed for personal trainers and their clients. Trainers create workout plans and track client training data on the platform; clients check their programs anytime and log their results, extending coaching beyond the session itself.
The project covers the full lifecycle of a SaaS product: requirements definition, data modeling, interface design, subscription payments, multi-tenant architecture, and admin tooling — all delivered independently. It's the clearest proof of our end-to-end capability for custom system development.
Challenge
The Challenge
Multi-tenant data isolation
Each trainer operates like an independent studio: client data, programs, and logs must be strictly isolated while sharing one codebase and architecture.
Two very different user roles
One platform serves two distinct workflows — trainers programming and managing, clients viewing and logging. Both experiences had to feel intuitive on their own terms.
Structuring training data
Sets, reps, load, perceived effort — training variables are many and messy. The data model had to stay flexible while supporting long-term analytics.
Subscription payments
The platform runs on subscriptions, requiring payment gateway integration plus plan management and payment-status synchronization.
Solution
The Solution
Full-stack Next.js architecture
Built with Next.js and TypeScript, sharing type definitions across the stack; PostgreSQL with Prisma ORM keeps development fast and data consistent.
Role-centered interface design
The trainer side focuses on programming and client overviews; the client side on today's workout and history. Each role gets a lean, purposeful flow.
Modular programming system
Programs are modeled as 'training day → exercise → sets,' letting trainers copy and adapt templates and dramatically cutting weekly programming time.
Complete admin tooling
A platform admin dashboard manages tenants, subscriptions, and usage — the foundation for long-term operations.
Highlights
Highlights
Workout plan management
Trainers build, copy, and adjust programs quickly, tailoring weekly training to each client.
Training logs
Clients log weight and reps set by set, with completion status at a glance and full history preserved.
Data tracking
Training volume and progress trends visualized in charts — making coaching results visible.
Multi-tenant architecture
Every trainer gets an isolated data space, with security and separation enforced at the system level.
Subscription billing
Integrated payment gateway supporting subscription plans and payment-status management.
Admin dashboard
A complete operations backend for tenants, subscriptions, and platform usage.
Outcome
The Outcome
- A complete SaaS product taken from zero to launch, now live and continuously iterated
- The multi-tenant architecture is proven in production — new trainers can onboard instantly
- The experience gained in permissions, payments, and data modeling now underpins our custom development projects
If you're considering a booking system, membership platform, or any custom system, SimpleTraining is a working demonstration of what we deliver end to end — from product planning to a live, operating service.
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