Frontend E-Commerce Application

Completed frontend project

E-Millenial Store

A responsive e-commerce experience with product browsing, cart management, customer validation, purchase summaries, and Paystack payment integration.

My role

Frontend developer

Core stack

HTML5 · CSS3 · JavaScript

View source

e-millenial-store.kwabenasoadwa.dev

The problem

The project required a simple but complete purchasing flow without using a frontend framework. Cart state, customer details, totals, validation, and payment processing all needed to work with vanilla JavaScript.

The solution

I created a modular JavaScript shopping workflow that manages products, cart quantities, customer information, totals, purchase summaries, and Paystack payment initiation.

Project overview

From practical need to complete product.

E-Millenial Store is a responsive shopping interface that demonstrates the complete customer journey from product selection to payment confirmation.

HTML5CSS3JavaScriptPaystack API

Responsive product view

One interface, every screen.

The same product is presented across desktop, tablet, and phone frames to show how the interface adapts—not just how it looks in one screenshot.

desktop

tablet

phone

System architecture

A clear delivery path from the user interface through application logic to data and external services.

01Responsive HTML product catalogue

02Vanilla JavaScript state and event layer

03Cart and checkout validation workflow

04Paystack payment integration

My responsibilities

Responsive interface implementation
Cart state and modal interactions
Customer validation and purchase summaries
Paystack integration and end-to-end testing

Key outcomes

Delivered a complete browse-to-checkout customer journey
Maintained cart totals and quantities without a framework
Integrated a real payment workflow into a responsive interface

Key features

Interactive shopping cart
Paystack payment workflow
Customer form validation
Purchase-summary interface
Responsive mobile-first layout

Engineering challenges

Maintaining cart state without a framework
Calculating totals and quantities accurately
Integrating the Paystack checkout process
Keeping modal interfaces responsive

Future improvements

Add persistent cart storage
Connect the interface to a product database
Add customer authentication
Add order-history functionality

Lessons learned

What this project improved in my engineering process.

01Small state-management utilities make vanilla JavaScript easier to maintain
02Payment flows require clear validation and user feedback
03Mobile checkout layouts must be tested with realistic content

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