Dynamic Construction Contract App

I want a mobile application that lets contractors and residential clients manage building contracts from start to finish, all on their phones. The core of the app is a living contract: either side can propose changes mid-project, but nothing updates until both parties tap “accept”. Once approved, the amended clauses instantly recalculate and display the new running total so everyone stays in sync on scope and cost.

I need this to work seamlessly on both iOS and Android, so a cross-platform stack such as Flutter or React Native makes sense, provided the finished builds feel completely native. Secure sign-up and log-in are required for both contractors and clients; roles determine who can create, edit, or merely view agreements.

Because clear deliverables help everyone, here’s what I expect to receive:
• Universal mobile app (iOS & Android) compiled and ready for store submission
• Role-based authentication tied to a cloud database
• Contract editor supporting text, numbers, photos and file attachments
• Change-request workflow with dual approval and timestamped history
• Automatic running-total calculation, visible to both parties at all times
• Source code, build instructions, and a short hand-over session

Push notifications for pending approvals and a simple administrator dashboard would be a welcome bonus if they can be added without delaying the core release.

I’m aiming for a clean, intuitive interface; reliability is more important than flashy extras. If you’ve built contract, finance, or workflow apps before and can hit these marks, I’d like to see how you’d approach the build and timeline.