GarageBook is a commercial B2B SaaS platform that digitizes the daily operations of auto workshops — job cards, estimates, invoicing, inventory, accounting, and customer retention — all from a mobile phone. The product runs on a paid subscription model (₹10,000/year or ₹22,000 lifetime) and is actively used by mechanics and garage owners across India to replace pen-and-paper workflows.
During a 7-month internship at Zymbia Interactive Technologies (CaRPM), I worked as one of two Flutter developers — alongside a senior — and helped build the app from scratch through to production release on both Android and iOS.
Custom Offline-First Sync Engine The most technically demanding part of this project was designing the offline-first synchronization module. Garage owners often work in low-connectivity environments but still need to log jobs, track inventory, and update customer records in real time — and many workshops use the app across multiple devices simultaneously (owner, mechanics, front desk). I built a custom sync engine that:
- Tracks all local changes (job cards, inventory updates, customer interactions) in a structured queue
- Reconciles state across multiple devices working on the same garage account
- Handles bidirectional sync — pushing local changes to the server and pulling remote updates back down
- Resolves conflicts when the same record is updated on multiple devices
- Operates seamlessly in the background without blocking the UI
This sync layer became the backbone of the app's reliability and is what enabled garage owners to trust the app for daily operations.
Core Features I Built
- Job Cards — digital job tracking with parts, services, status, and image galleries
- Estimates & Invoicing — generate, share, and digitally approve customer estimates; downloadable invoices for tax filing
- Inventory Management — automated stock tracking with low-inventory alerts
- Accounting Dashboard — automatic sales tracking, monthly PnL, Excel exports
- Customer Retention — auto-shortlist customers due for next service
- In-App Purchases — subscription tier handling for Plus / Lifetime plans
- WhatsApp Direct Share — send job summaries and invoices to customers via WhatsApp
- Multi-language Support — localization for regional Indian languages (the user base includes Hindi-speaking workshops)
- Push Notifications & Analytics — Firebase Cloud Messaging + Firebase Analytics
- Error Monitoring — Bugsnag integration for production crash reporting
Release Process Shipped progressively — initial beta with select garage owners to collect feedback and feature requests, followed by iterative production releases on App Store and Play Store. The app evolved through multiple versions during my time there based on real workshop feedback.
Live Product Available on Play Store and App Store. Currently serving 10,000+ Android downloads, 8,000+ iOS downloads, with workshops actively paying for the product.