Scalable UK Food Trade & Event Catering Platform

I am looking for a developer to build a scalable UK platform for the food trading and event catering industry. This is not just a simple directory website. The long-term goal is to connect food traders, event organisers, suppliers, service providers and staff/jobseekers in one platform... (Budget: £250 - £750 GBP, Jobs: API Development, Cloud Computing, Database Design, Marketplace Development, Mobile App Development, Project Management, Web Development)