I’m building a SaaS product and now it’s time to harden the server-side foundation. The scope is focused and technical: • Architect and implement robust user authentication and role-based management that can scale as the customer base grows. • Set up reliable data storage using an SQL stack—MySQL or PostgreSQL—complete with migrations, indexing, and backup routines. • Expose well-documented RESTful APIs so the front-end team can consume core features easily and securely. I already have front-end resources in place; what I need from you is clean, test-driven backend code, clear documentation, and deployment scripts that work in a typical containerised environment (Docker or similar). If you see compelling reasons to introduce NoSQL for a specific module, feel free to make your case, but the primary datastore should remain SQL. Deliverables will be reviewed against automated tests, code readability, and successful deployment to a staging server. Let’s discuss timelines, milestones, and any tooling preferences you have once you’re on board.