Independent Product

Multibiller — Mobile Invoicing and Quote Management

A mobile application that enables freelancers and small businesses in German-speaking countries to create, manage and share quotes, invoices and paid invoices.

My RoleFull-stack product development
PlatformsiOS · Android
StatusMobile application developed
Multibiller mobile application screens

01

Project Overview

  • Multibiller provides mobile quote and invoice management for freelancers and small businesses in German-speaking countries.

02

The Problem

  • Preparing professional quotes and invoices can be complex, especially when working with multiple company profiles.

03

The Solution

  • Reusable company, customer and product records simplify quote, invoice and paid-invoice workflows.

04

My Role and Contribution

Product and business rules

  • Product planning, mobile experience and multiple company profiles
  • Quote, invoice, payment-status and calculation rules

Document experience

  • Professional document layout and PDF generation
  • Native mobile sharing and local data management

05

Key Features

  • Company, customer and product management
  • Quote-to-invoice conversion
  • Tax and total calculations
  • PDF generation
  • Mobile sharing

06

Technical Architecture

  • The mobile app manages company, customer, product and document flows, with a document layer producing PDF output.
  • Backend and infrastructure technologies are not stated because the sources do not confirm them.

07

Technical Challenges

Invoice data consistency

Relationships and calculations across companies, customers, products, documents and line items needed to remain consistent.

08

Key Decisions

  • The product focuses on quote and invoice creation instead of complex accounting.
  • Native system sharing is used for documents.

09

Outcome

  • Quote, invoice, paid-status, PDF generation and mobile sharing flows have been implemented.

10

Status

  • Mobile application developed
  • Multiple company profiles supported
  • Designed for German-speaking markets

11

Technologies

React NativeJavaScriptLocal storagePDF generationNative mobile sharing