Job Estimation & Invoice App Development

I'm looking for a skilled app developer to create a comprehensive app for both iOS and Android. The main purpose of this app is to facilitate job estimations and invoice generation.

Key Features:
- Job Estimation Tools: The app needs to incorporate robust job estimation tools that can accurately assess the costs and timeframes for various tasks.
- Invoice Generation: An integral part of the app is its ability to generate professional, accurate invoices based on the job estimations.
-Home Depot Material Generator: The app should also have a feature that can generate a list of materials needed from Home Depot for each job.

Ideal skills for this project include proficiency in cross-platform app development, experience with creating productivity tools and e-commerce apps, and a good understanding of job estimation and invoicing processes. A background in integrating third-party databases, like Home Depot's inventory, would be a plus. Please provide examples of similar applications you've developed in your bid.