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This Is How We Build User Management System For SaaS MVP: Give away user management, UI and recurrent billing(with Stripe) for free(MIT license) We’ve used Adminator and made it functional by slapping Firebase and Svelte on top. Adminator aims to help companies scale quickly and focus on the core of their product. It’s one of the few frameworks I've used in 14 years of coding that does not get in the way AT ALL — simply write HTML(with templating system), CSS and Javascript.