Brandon outlines a vision for building a multi-tenant platform in 2026, emphasizing user ownership and customization. He stresses the importance of domain selection, recommending separate domains for tenant workloads to protect the main site’s reputation. Using a new domain for tenant content prevents risks associated with malicious activities, such as phishing. This approach mirrors practices in cold email outreach, where a new domain helps avoid blacklisting. He highlights how browsers handle subdomains, noting that they treat them as siblings by default. To address this, Brandon suggests leveraging the Public Suffix List (PSL) to ensure cookies and storage remain isolated among tenants. He discusses the architecture of the platform, advocating for a clear routing mechanism via Cloudflare Workers. This setup isolates tenant operations and prevents one tenant's issues from affecting another. Custom domains become a key feature as tenants grow, shifting the reputation burden away from the platform. This setup involves a straightforward process of domain verification and DNS management, allowing tenants to establish their brand identity. Brandon also acknowledges the limitations imposed by Cloudflare, such as CPU time and memory, and recommends aligning these limits with billing plans to maintain predictability. For tenant satisfaction, the platform must prioritize a clean API and a user-friendly interface. Tenants care more about functionality than the underlying architecture. The API should enable them to manage resources seamlessly, without exposing internal complexities. This design approach not only enhances usability but also lays a foundation for future integrations and enhancements.