Flexible POS App with Flutter: Advanced Features and Optimization Techniques

Jerry PM
3 min readApr 17, 2023


Point of Sale (POS) II

Welcome to the second part of our series on building a flexible Point of Sale (POS) app using Flutter. In the previous article, “Designing a Flexible POS App with Flutter: A Journey of Continuous Improvement,

We covered the initial creation and design of the app, and now we’re ready to take it to the next level. In this follow-up article, we will discuss the implementation of additional features such as payment history tracking, inventory management, and overall optimization to enhance the app’s performance and usability.

Adding a Payment History Feature:

To help users keep track of their transactions, I’d a payment history feature to the POS app. This feature will display a list of all completed transactions, including details such as date, time, items purchased, and the total amount paid. To achieve this, we will create a new screen with a list view that fetches data from the app’s database and displays it in a user-friendly format. Users can also filter the list by date, payment method, or other criteria to easily find specific transactions.

Implementing the Order Feature:

The order feature allows users to create and manage a list of items that customers want to purchase. This is a crucial aspect of any POS app and will help streamline the transaction process.

The invoice will be sent to the customer’s email, thereby reducing paper usage. If tap “Place New Order” will be back home page.

App Features:

  • Written completely in Flutter
  • MVVM code structure, with decoupled modules for easy drag-and-drop. functionality
  • Singleton design pattern for optimized data handling, reducing memory usage by avoiding multiple service instances
  • User-friendly experience when permissions are denied
  • Utilizes GitHub API & Dummy API Swagger for repository management
  • Local data storage

and this app I’d sell in code-canyon

These enhancements not only streamline the transaction process but also improve the app’s overall performance and usability. Furthermore, by sending invoices to customers’ email addresses, we have successfully reduced paper usage, contributing to a more sustainable approach.