Complete Cross-Platform Community & Events App — iOS, Android, Web, Backend + Admin

The Budget is just a sample number. Please Write down your own price. Bastion is a premium, invitation-friendly members club that lives both in real life and in an app. Members pay a monthly/annual membership and get access to curated in-person gatherings (long dinners, early-morning runs, members-only tables), a private social feed, sub-communities, a member directory, and an earned rank & badge progression system. The app is the companion to the real-world club: it handles discovery, RSVPs, payments, the social layer, and the member's standing. Think "private social club / community OS": part events platform, part private social network, part membership & CRM — with a strong, cinematic, editorial design. We have a complete, polished design for every screen (attached). We are looking for an experienced team (or individual) to build the entire platform to production quality. 6. What to include in your proposal So we can compare quotes fairly, please include: Total fixed price (or a clear estimate range) to deliver all 5 pieces to production. A per-deliverable breakdown (backend / web / iOS / android / admin). Your recommended tech stack (incl. mobile native vs. cross-platform) and why. A timeline with milestones, and your team size/composition. What you'd handle vs. need from us (e.g., App Store/Play accounts, payment provider account, cloud hosting). Two or three relevant portfolio examples (social / community / events / marketplace apps). Your assumptions and anything you'd descope for a v1 vs. v2.