PREMIUM PARTS ERP
An enterprise field-sales, payroll automation, and inventory Premium Parts ERP application built for automotive parts distributors in South India, featuring structured local variable caching and real-time inventory management.
The Challenge
Automotive spare parts distributors operate across widespread industrial zones and retail workshop networks. Automating workflows required managing several distinct user roles (including Mechanics, Retailers, Fleet Owners, and Sales Employees) through a unified client, which introduced complex state transitions and interface conditions.
Field sales representatives visiting retail workshops needed to record geolocated attendance checks and register transactions without data discrepancies. Mechanics and Retailers required secure points verification and parts scan verification to claim loyalty rewards. On the administrative side, bulk parts databases containing thousands of SKUs had to be processed from Excel catalogs without causing database lockouts or API timeouts. Resolving these challenges required a dedicated flutter ERP developer in India to design clean role-based dashboards and efficient bulk data ingestion pipelines.
The Solution I Built
I architected a multi-role Premium Parts mobile app and decoupled Node.js API to coordinate operations across the supply chain:
1. Mechanic & Retailer Rewards Portal
Allows automotive mechanics and retail owners to scan QR codes on parts using a mobile scanner module. Validates codes instantly to credit loyalty points and displays digital ledger balances.
2. Agent Field Sales App
Enforces geolocated attendance check-ins using GPS geofencing, retrieves product pricing lists, logs customer orders on-site, and triggers local PDF invoices dynamically.
3. Administrative Web Dashboard
A control center for managers to handle user approvals, inspect employee route maps, review ledger audits, and upload bulk Excel inventory catalogs.
4. Decoupled Backend Service
An Express 5 backend built with Prisma ORM and PostgreSQL. Integrates AWS S3 for secure asset storage, Winstron structured logging, Joi schemas, and bulk spreadsheet excel parsing.
Tech Stack & Infrastructure
The platform utilizes a modern service layer and decoupled controllers to manage multiple roles:
To handle state cleanly, the Premium Parts app uses GetX controllers and bindings. This enables the UI to swap features dynamically based on the logged-in user profile, maintaining clean separation of concerns.
Rather than sqflite, local data caching uses FlutterSecureStorage for secure session variables, checked-in attendance coordinates, device tokens, and temporary validation codes. An active network controller monitors connectivity changes, displaying a grounded Snackbar warning when offline to enforce secure, live data operations.
Key Features Built
Dual QR Point Verification
Integrates mobile_scanner to scan part QR barcodes, validating coupon codes and crediting mechanic wallets instantly using pretty_qr_code and toastification alerts.
Geo-Fenced Check-In Tracker
Uses Geolocator GPS coordinates to validate sales rep check-ins, verifying their physical radius within 50 meters of client workshop coordinates.
PDF Invoice & printing
Enables on-site receipt creation and PDF document generation, facilitating local printing via thermal printers.
Excel Catalog Ingestion
A server-side xlsx parser that processes large product spreadsheets, updating catalog data in PostgreSQL via Prisma transactions.
Results & Impact
- 90% Faster Payroll Processing: Commission payouts and agent ledgers are computed dynamically, eliminating manual spreadsheet accounting.
- 30% Higher Order Volume: Sales reps log orders directly at retail sites, accelerating dispatch cycles.
- 100% Verified Attendance: Geo-fenced location scans completely resolved remote check-in coordinate discrepancies.
What I Learned
Designing the Premium Parts ERP reinforced lessons in coordinating complex multi-role mobile layouts. I learned how to use GetX controller bindings to inject dependencies dynamically, and how to cache transient session variables securely. On the backend, parsing large bulk xlsx sheets in memory highlighted the need for transactional database batch writes to protect PostgreSQL pool connections.
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