Invoice Maker - Smart Billing & Invoicing App

[Invoicing App]

Tech Stack

Kotlin, Java, XML, Dagger, Retrofit, OkHttp, Gson

Organization(s)

Content Arcade

Resources

Google Play

Invoice Maker - Smart Billing & Invoicing App

Project Details

The Challenge

Small business owners, freelancers, and independent contractors needed a fast, professional way to create and send invoices on the go, without being tied to a desktop, expensive accounting software, or manual paper-based billing processes that slowed down getting paid.

The Solution

Invoice Maker is a clean, professional billing app for Android that lets users generate invoices, smart receipts, and estimates in minutes, directly from their phone. With full offline support, it keeps billing workflows fast and reliable whether users are in the office or in the field.

As the Android developer, I built and integrated the full data layer, implementing real-time server sync alongside robust on-device storage to ensure a seamless, always-available billing experience.

What I Built

Invoice & Receipt Generation: Create professional invoices, smart receipts, and estimates instantly using customizable templates

Itemized Billing: Add multiple line items, apply tax invoices, set terms and conditions, and customize every invoice to client and project needs

Real-Time Cloud Sync: Connected to a dedicated server for real-time data upload and download, keeping invoices accessible and up to date across sessions

Offline-First Storage: On-device data persistence ensuring full functionality even without an internet connection

RESTful API Integration: Implemented robust API layer using Retrofit, OkHttp, and GSON for reliable, efficient client-server communication

Impact

Delivered a professional billing tool that freed 10K+ small business owners and freelancers from manual invoicing, putting fast, reliable, client-ready billing in their pocket.