I’m building a marketplace dedicated to selling digital products and need a custom-built ecosystem that includes both a responsive website and a companion mobile app. Core functionality • User accounts and profiles with secure authentication and the usual workflows for sign-up, sign-in, password reset, and profile management. • Robust search and filter options so visitors can quickly locate files by category, price, or tags. • An integrated payment gateway that supports instant digital delivery once a purchase is confirmed. Scope of work 1. Information architecture and visual mock-ups: help refine the user journey and produce wireframes or Figma screens for web and mobile. 2. Full-stack development: create a scalable back-end (your preferred stack) with API endpoints consumed by both the website and the mobile app. 3. Front-end implementation: responsive web UI plus iOS and Android builds (native or cross-platform—React Native, Flutter, or similar). 4. Admin console: dashboard to upload products, manage orders, issue refunds, and view analytics. 5. Payment integration: Stripe or a comparable gateway configured for secure digital delivery. 6. QA & hand-off: functional testing, basic documentation, and one round of revisions so everything runs smoothly before launch. Tech flexibility The project is greenfield, so I’m open to your recommendations on frameworks, database, hosting, and DevOps best practices, provided the solution remains easy to maintain and extend. Deliverables • Functional prototype of the website and app • Source code with clear documentation • Deployment guide (server and app stores) • Post-launch support window for bug fixes If you’ve successfully launched similar custom marketplaces, please share links or demos.