Key Architecture Patterns for Scalable Full-Stack TypeScript Apps

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A developer who built CitizenApp into a production SaaS serving thousands of concurrent users has shared the architectural lessons learned along the way. The article recommends using a pnpm monorepo with shared TypeScript type packages, so that any API contract changes are immediately caught across both frontend and backend codebases. On the backend, the author advocates organizing FastAPI endpoints around business domains rather than generic CRUD operations, bundling usage checks, external API calls, and audit logging into cohesive units. For the frontend, the piece highlights React 19 Server Components and Server Actions as a simpler alternative to heavyweight client-state setups like Zustand combined with TanStack Query. The overall guidance emphasizes treating the frontend and backend as one product with two deployment targets, a mindset the author says prevents costly contract-mismatch bugs early in development.

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