We are looking for an experienced full-stack developer to provide an initial cost and time estimate for building the MVP of a moderated, multi-language marketplace platform. This is not a simple website. It is a controlled marketplace with manual seller approval, structured listings, deposit payments and post-purchase contact reveal logic. At this stage, we are requesting a rough price range and timeline estimate. The selected developer will receive full project documentation. The platform will: Allow registered companies (not private individuals) to create listings Require manual admin approval before listings go live Support structured listing data (price, region, availability, description) Provide webshop-style checkout Support deposit payment via Stripe (or similar provider) Reveal seller contact details only after successful purchase Include a review system (only after purchase) Launch in 3 languages: Hungarian, English, German This is a moderated marketplace, not a classified ads site. What We Do NOT Need in Phase 1 No mobile app No live chat No complex AI systems No marketing automation No multi-country expansion logic We want a clean, scalable foundation — not overengineering. Technical Approach We are open to different technical approaches (custom build, framework-based, plugin-based, AI-assisted development), as long as: The system is scalable and extendable User roles and permissions are properly implemented Contact reveal logic is securely enforced on the server side The solution is maintainable and documented. Please Include in Your Proposal Estimated development cost (range) Estimated timeline Proposed technical approach (briefly) Similar projects (links) Confirmation whether you use AI-assisted development tools Short, structured proposals are preferred. Please start your proposal with the word “Marketplace” so we know you have read the full description.