A business may need a website, an online store, product management, customer management, forms, payments, SEO, and automation. Webruno allows businesses to create and manage websites and online stores while also providing CRM, ecommerce, payments, SEO, forms, customer management, automation, and AI-assisted workflows. After several years of development, these are some of the engineering challenges and decisions behind the platform. js Express MongoDB Mongoose Redux Toolkit Tailwind CSS Material UI We chose technologies that allowed us to move quickly while keeping enough flexibility for a large, multi-tenant SaaS application. Building a multi-tenant platform One of the first major architectural challenges was supporting many businesses inside the same platform.