Passion Fitness

The Challenge

Martial arts gyms, particularly Brazilian Jiu-Jitsu (BJJ) academies, needed a specialized platform to manage class bookings, track member belt progression, and foster community engagement. Generic gym software lacked martial-arts-specific features like technique progression tracking and member roll (sparring) connections.

Key requirements:

• Class booking — Schedule management for group classes, open mats, and private sessions
• Mon Parcours (My Journey) — Belt progression tracking with technique milestones and instructor evaluations
• RollMap — BJJ-specific knowledge graph connecting members by skill level, training partners, and technique exchanges
• Native mobile app — Members need on-the-go access to schedules, progression tracking, and training logs
• Payment integration — Automated subscription billing with Paddle for international payment support
• Multi-tenant SaaS — Support multiple gym locations with isolated data and branding

Our Approach

We built a dual-platform system—Next.js web dashboard for gym staff and Expo React Native mobile app for members:

Class Booking & Scheduling

• Live calendar — Real-time class availability with capacity limits
• Automated reminders — Push notifications 1 hour before scheduled classes
• Attendance tracking — Staff mark attendees; system logs training frequency per member

Mon Parcours — Belt Progression System

• Technique curriculum — Define belt requirements (e.g., “Master 5 guard passes for blue belt”)
• Instructor evaluations — Coaches review member progress and award stripes/belts
• Progress dashboard — Members see their journey: techniques learned, rolling hours logged, belt promotion timeline

RollMap — BJJ Knowledge Graph

• Training partner network — Visualize who trains with whom; discover new rolling partners
• Technique exchange — Members tag techniques practiced during rolls, building a shared knowledge base
• Skill-based matching — Suggest sparring partners based on weight class, experience level, and training goals

Mobile-First Member Experience

• Expo React Native — iOS and Android apps from a single codebase
• Offline support — View schedules and progression data without connectivity
• Push notifications — Class reminders, belt promotions, and training partner invites

Payment & Multi-Tenancy

• Paddle integration — Handle subscriptions, invoicing, and tax compliance for international gyms
• Supabase RLS — Strict data isolation per gym using Row-Level Security policies
• Custom branding — Each gym configures logo, colors, and belt system (some gyms use modified stripe progressions)

The Stack

• Web Dashboard: Next.js 14 with App Router, TypeScript, TanStack Query
• Mobile App: Expo React Native, TypeScript, Expo Router
• Backend: Supabase (PostgreSQL + Auth + Realtime + Storage)
• Database: PostgreSQL with Row-Level Security policies for multi-tenancy
• Payments: Paddle for subscription billing and invoicing
• Infrastructure: Vercel for web, EAS for mobile builds, Supabase managed backend

Outcome

Passion Fitness launched in July 2025 and is now in production at BJJ gyms in Morocco:

• Member engagement — Training frequency increased as members tracked progression and connected with partners via RollMap
• Instructor efficiency — Belt evaluations streamlined from paper logs to digital tracking
• Mobile adoption — 80%+ of members use the app weekly for class bookings and progression checks
• International ready — Paddle handles multi-currency subscriptions for gyms expanding to Europe

Engineering Lessons

Expo simplifies mobile deployment: EAS builds and over-the-air updates let us ship bug fixes and features without App Store approval delays (critical for early-stage products).

RollMap graph visualization is the killer feature: Early versions focused on booking and progression; RollMap’s social graph became the most requested feature once members saw training partner connections.

Supabase Realtime powers collaborative features: Class capacity updates and instructor evaluations propagate instantly across web and mobile, essential for multi-device workflows.

Paddle abstracts payment complexity: Handling VAT, SCA, and multi-currency invoicing would’ve taken weeks to build; Paddle handled it out of the box.

Building a niche SaaS platform with web + mobile? Let’s talk.