I am looking for a partner to develop a centralized cloud-based CO₂ calculation platform for a construction and infrastructure company operating across multiple branches and project sites. The purpose of the platform is to provide one central digital system for collecting emissions-related operational data, automatically calculating CO₂ emissions, and generating dashboards, analytics, and reporting. The system should be accessible through: Web platform (desktop/browser) Mobile UI (applications for Android and iOS) Both web and mobile applications should be fully connected to one central cloud database and calculation engine, so all branches work within the same platform. Core Functions The platform should calculate CO₂ emissions from operational areas such as: Fleet & transportation Construction equipment & machinery Building materials (cement, steel, concrete, asphalt, etc.) Energy consumption (offices, camps, project sites) Business travel Waste management / recycling Users should be able to input data manually, upload files/documents, and submit data directly through the mobile app from project sites. AI Features The platform should include AI-powered functions such as: Automatic estimation where data is missing Detection of unusual or incorrect entries Smart recommendations for emission factors Predictive CO₂ forecasting (monthly / annual / project-based) Trend analysis and reduction opportunity suggestions Intelligent categorization of uploaded documents/data Flexible Category Management Administrators should be able to create new emission categories, products, materials, or fuel types manually, including defining their emission factors, units, and classifications, without needing software redevelopment. This creates a growing internal emissions database that can be reused across all branches. Dashboards & Reporting The platform should provide: Real-time CO₂ dashboards Emissions by category / project / branch Historical trend analysis Benchmarking between branches Charts and statistics Exportable PDF / Excel reports Technical Requirements Preferred solution: Secure cloud hosting Web application + mobile apps Centralized database Shared backend API Role-based access control Scalable architecture for regional rollout High security and audit trail Please provide your recommendation regarding architecture, timeline, estimated cost, and suitable technology stack.