Cross-Platform Web & Mobile App

I want a single, maintainable code-base that serves three touch-points: a responsive web application, installable builds for both iOS and Android, and an online administration dashboard. The stack should... (Budget: £3000 - £5000 GBP, Jobs: Angular, AngularJS, Artificial Intelligence, Claude Code, Full Stack Development, Mobile App Development, OpenAI Codex, Vue.js, Web Development)