Flutter Mobile Application — Field Tracking, Contracts Workflow & Multi-Role System

I developed the Chamber News Directory mobile app using Flutter, designed to manage field operations, contract creation, sales tracking, and document workflows for a newspaper/directory business.

The client needed a system that ensures sales representatives actually visit their assigned locations, and a secure way to handle contracts and invoices that cannot be forged or manipulated.
I engineered the entire solution end-to-end.

What I Built (Technical Highlights)

✔ Flutter Cross-Platform Mobile App

Built with Flutter, supporting smooth performance on Android & iOS, with clean UI and clear workflows for each user role.

1. Multi-Role Permissions Architecture

I implemented a fully separated roles system:

• Admin

• Supervisor

• Sales

• Delivery / Newspaper Carrier

Each role sees different screens, different actions, and different workflow permissions.

This required:

• Custom role-based routing

• Isolated UI components

• Secure API endpoints per role

• State management per role context

2. Real-Time Sales Tracking System (Admin-Only Visibility)

This is the core innovation of the project.

I built a GPS tracking module that:

• Records the live location of sales representatives

• Sends coordinates securely to the backend

• Shows the admin exact movement history & check-ins

• Enables verifying whether the sales actually visited the clients

Tracking is:

• Background-safe

• Battery optimized

• Tamper-protected

3. Smart Contracts System With Dual Signatures

The contract flow is one of the most complex parts I built:

Contract Workflow:

1. Sales visits the client → admin verifies the visit

2. Sales creates a contract request

3. The contract must be signed digitally by:

   • the sales representative

   • the client

4. The app sends:

   • Email to the client

   • Email to the company

   • Signed PDF contract

This makes the contract impossible to steal, fake, or duplicate, because:

• both signatures are required

• timestamps and device data are embedded

• emails are sent instantly as proof

• no contract is accepted without location verification

4. Invoices, Pricing & Plans

All roles (except admin-only features) have access to:

• Contract pricing

• Newspaper/directory packages

• Invoice generation

• Historical contract lists

5. Delivery Role Features

The delivery person sees only:

• Delivery list

• Client locations

• Status update options

Lightweight and simple for field usage.

6. API Integration & Security

The app communicates with a secure backend using:

• Token authentication

• Encrypted location packets

• Role-based middleware

• Validation layers for contracts, signatures, and invoices

What This Project Demonstrates About My Skills

• Strong Flutter architecture (Clean, Provider/Bloc, structured navigation)

• Ability to build enterprise-level workflows

• Knowledge of real-time location tracking

• Implementing digital signature systems inside mobile apps

• Multi-role permission engineering

• Document workflows & secure emailing

• Designing operational apps that prevent fraud or misuse