Senior Full Stack Engineer (Web, iOS & Android) AI ML user/business

We're building an AI-powered SaaS platform available on Web, iOS, and Android.We're looking for an experienced full stack developer to take ownership of the remaining development. The platform includes user authentication, subscriptions, AI-powered features, third-party API integrations, cloud infrastructure, and an admin dashboard. This is a long-term project with ongoing feature development after the initial release. User Registration, login & phone verification User profiles & interest selection AI-powered matching & recommendations Location-based search (nearby users & businesses) Connection requests & followers Groups (create, join, invite) Social feed, comments, reactions & sharing Private & group chat File, image & video sharing Video calling Push notifications Ratings & reviews Subscription plans Business Business profiles Category management Business groups & communities Featured posts & promotions Analytics dashboard Customer engagement tools Advertising module Nice to Have AI/ML recommendation engine Computer vision or facial recognition AR features Scalable cloud architecture Required Skills React / Next.js React Native or Flutter Node.js or Python PostgreSQL AWS REST APIs AI/ML experience Real-time chat Mobile development This is a long-term project with ongoing development after the MVP. Please include examples of similar platforms you've built, your recommended tech stack, estimated timeline, and portfolio or GitHub.