I rebuilt the same SaaS backend five times. So I turned it into one SDK.

Short summary

A founder who shipped five SaaS products with his brother kept rebuilding the same backend—auth, Stripe, multi-tenancy, workflows, email, webhooks—so he extracted it into a single SDK called BuildBase for React/Next.js. It now runs all five products in production with nineteen integrated modules including per-org database isolation, event-driven workflows, and bring-your-own-Stripe billing. The post is candid about limitations: not open source, React/Next.js only, and a known connection-pool ceiling that caps scaling.

• •Founder extracted repeated SaaS backend work into BuildBase SDK after building five products
• •19 integrated modules: auth, Stripe billing, multi-tenancy with per-org DB isolation, workflows, email, feature flags
• •Honest about tradeoffs: not open source, React/Next.js only, known scaling ceiling, early and bootstrapped

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