Cross-Platform Marketplace App Build

I am launching a scalable e-commerce marketplace and need the complete mobile application built for both iOS and Android. The first milestone centres on three core capabilities that must be production-ready from day one:

• Secure user authentication – email or social sign-in, token refresh, and logout flows handled safely.
• Seamless payment gateway integration – in-app checkout that passes all compliance tests and returns clear transaction states to the UI.
• Product reviews – verified purchasers can post ratings and comments that update instantly across devices.

Wireframes and an API (REST/GraphQL) are already in motion, so your focus will be the full mobile build, state management, and preparing store-ready releases. Clean architecture, modular code, automated tests, and CI/CD pipelines are expected to keep the codebase performant and easy to scale.

Deliverables
• Complete iOS & Android source code
• Integrated and tested authentication, payment, and review modules
• Build scripts / CI configuration files
• App Store and Google Play release builds with basic branding
• Hand-over documentation for setup and deployment

Acceptance criteria
• Flawless operation on the latest two major OS versions
• No critical crashes in release mode
• Payments succeed in both sandbox and live environments
• Code meets provided linters and unit-test coverage targets (≥ 90%)

If you have a track record of shipping high-quality cross-platform apps that meet these standards, let’s discuss the roadmap and timeline.