Full-Stack Developer for Construction Platform

We are looking for a full-stack developer to turn our existing PROCOAT S1 prototype into a fully functional internal web application. We are an epoxy and polyurethane flooring company. The platform will be used only internally by our employees, with up to approximately 100 users. The existing prototype will be attached to the job post and should be used as the main reference for the design and functionality. Main requirements The system should include: Dashboard Projects / construction sites Employee calendar Daily work reports Employee management Materials Tools/equipment Project archive User roles and permissions Warehouse We also need a simple materials warehouse integrated with projects. For each material we need to see: Material name Quantity in kg Remaining stock in kg Material assigned/issued to a specific project Example: EP02 – 500 kg in warehouse | 100 kg assigned to Project #125 |Remaining warehouse stock: 400 kg No advanced consumption calculations are required. Requirements The application must be: Fully usable in Latvian Responsive for desktop and mobile Easy to use and maintain Easy to update and expand later Secure Database-driven Built with a modern and well-supported technology stack The current prototype uses mock data. The developer must create the real backend, database, authentication and production-ready system. We want full access to the source code and repository. When applying, please include: Recommended technology stack Estimated development cost/time/ hosting Whether you would continue from the existing prototype or rebuild it in a production framework