Build SaaS Invoice App (Similar to Invoice Simple) – Web + Mobile

We are looking for a reliable long-term development team to build and maintain a SaaS invoicing platform similar in concept to Invoice Simple. Project scope includes: Web application (admin + client side) Future mobile app expansion (Android/iOS) Invoice/PDF generation User authentication Subscription/payment integration Dashboard/reporting API/backend setup GitHub-based workflow Deployment/staging/production setup Important: We are specifically looking for a team that is experienced in proper development workflow and infrastructure management, not just coding. Required workflow/process: GitHub main branch must remain the official source of truth Developers work on separate branches Pull Request (PR) review process before merging Staging environment before production deployment Proper rollback/version control process Clear documentation and Loom walkthroughs Clean and organized code structure for future handover/replacement of developers We prefer teams that can: Clearly explain their deployment/devops workflow Setup GitHub → staging → production properly Work milestone by milestone Use Hubstaff/Upwork tracking if required Communicate clearly during Zoom/Google Meet sessions Bonus if experienced with: SaaS products Mobile apps CI/CD workflows WordPress integrations PDF invoice systems Stripe/payment gateways Please share: 1. Similar SaaS projects completed 2. Your deployment workflow/process 3. Team structure (frontend/backend/devops/mobile) 4. Estimated recommendation for MVP approach 5. Preferred tech stack 6. Whether you can support long-term maintenance Looking for long-term collaboration, not just one-time coding work.