No-Code SaaS Builder (Softr + Airtable/Notion) Turn Existing Notion System into a Member Portal

We have an existing Notion-based operating system consisting of multiple interconnected databases and are looking to transform it into a SaaS-style member portal. The goal is to create a secure web application where each user has their own private workspace and can only view and manage their own records. We are not looking for a duplicate-able Notion template. We are looking for a hosted solution with user authentication and access control. Existing Modules Our current system includes databases for: Content Management Products & Inventory CRM / Outreach Deal Pipeline Income Tracking Resources These modules are already built in Notion and serve as the basis for the new application. Scope of Work Recommend the best architecture Examples: Softr + Airtable Softr + Notion Glide Alternative no-code stacks Build the member portal Including: User authentication Dashboard CRUD functionality (create, edit, update records) Mobile-friendly interface Custom domain setup Ensure data privacy Each user should: Only see their own records. Never have access to another user's information. Have their access revoked when their account is deactivated. Documentation Please provide: Loom walkthrough videos Basic SOP documentation Recommendations for future scalability Ideal Experience We're looking for someone with experience building: No-code SaaS applications Membership portals Multi-tenant applications User authentication systems Row-level permissions Softr Airtable Glide Bubble (optional) Notion API (optional) Important This project is intended to create a software-like experience, not a traditional Notion template. Please only apply if you have experience building private, multi-user applications with proper permissions and user management, and what budget and timeline would you estimate.