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Stop treating process.env.X as a string | undefined. Use T3 Env and Zod to validate environment variables at startup with compile-time type safety.
Master const type parameters, variadic tuples, decorators, and the new satisfies operator to write type-safe backend code that catches errors at compile time.
Build scalable TypeScript monorepos with Turborepo, Nx, or native workspaces. Compare performance, caching strategies, and project structures for full-stack teams in 2026.
Enable strict mode incrementally in large codebases. Use migration strategies, utility types, discriminated unions for errors, branded types for safety, and satisfies for inference.
Sessions table. Events table. Audit log. Each row is small. But with 100,000 active users writing events every minute, it''s 5 million rows per day. No one added a purge job. Six months later the disk is full and the database crashes.