I’m planning an app that lets marketing teams build and refine rich customer personas without being locked into a single device. The core experience must run smoothly on iOS, Android, and the Web, sharing one code-base and a single back-end so users can jump between phone, tablet, and desktop without friction. Essential modules • Customer profile creation – a clean, guided flow for entering demographics, goals, pain points, and custom fields. • Behaviour tracking – capture in-app events or import them through standard connectors to common CRM, e-commerce, or analytics tools. • Analytics dashboard – surface segment insights, cohort comparisons, and persona evolution over time in real-time charts. Tech approach I haven’t fixed a framework yet, so feel free to suggest React Native, Flutter, or any modern alternative that can hit the “write once, deploy everywhere” target. I’m equally open on back-end stack as long as it supports REST/GraphQL endpoints that can plug into the usual SaaS ecosystems via out-of-the-box (or easily scripted) connectors. Scope & deliverables 1. High-fidelity clickable prototype that I can test on phone and browser. 2. Production-ready code for all three platforms. 3. Documentation covering set-up, environment variables, and how to add new connectors or data sources. 4. A brief walkthrough video or live hand-over session. Acceptance criteria • Identical UI/UX across devices with responsive layouts. • Persona data persists and syncs across platforms in <2 seconds. • At least two working sample connectors (e.g. Google Analytics and HubSpot) proven in a demo. • Unit tests for critical logic and an automated build pipeline. If you’ve shipped cross-platform apps with complex data integrations before, I’d love to see your approach and a timeline to MVP.