Full Stack Developer Needed – Billing Software (Flutter + NestJS)

I am looking for an experienced Full Stack Developer to build a modern, responsive, mobile-first Billing & Invoicing Software with support for multiple companies and Indian GST. Tech Stack (Mandatory) Flutter (Web, Android, iOS, Windows, macOS) NestJS (TypeScript) PostgreSQL Prisma ORM Redis Docker & Docker Compose Ubuntu VPS Key Requirements Multi-company & multi-user support Indian GST (optional) Multiple invoice templates CSV/XLS/XLSX import & export PDF invoice generation Daily automatic backup & restore Responsive and elegant UI/UX Clean, scalable, well-documented code A detailed feature specification is attached and must be followed. AI Usage: You may use AI tools (ChatGPT, GitHub Copilot, Cursor, Claude, etc.) responsibly to improve productivity. However, all code must be reviewed, understood, tested, secure, and production-ready. Do not submit unverified AI-generated code. Deliverables: Complete source code Database schema & migrations API documentation Docker deployment Setup guide README Deadline (Strict) Project must be completed within 7 calendar days. Please apply only if you have experience with Flutter, NestJS, PostgreSQL, and can confidently meet the deadline. When applying, include: Relevant portfolio/projects GitHub (if available) Estimated delivery timeline