Developer shares real failures from shipping an AI SaaS app in a single weekend

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A developer built NexusOS, an AI workspace with research, document Q&A, and task management, over a single weekend using the AI coding tool Cursor. While the app launched successfully, several critical issues emerged in production, including database migration failures, missing environment variables, and a research feature that silently returned AI-generated answers instead of real web sources. The developer also flagged a Stripe webhook vulnerability where skipping server-side signature verification could allow forged payment events. Key fixes included running database migrations as part of the build process, enabling vector search extensions via migrations rather than manually, and connecting a live search API to prevent plausible-looking hallucinated output. The author concluded that AI tools accelerate coding but leave infrastructure setup, environment configuration, and output verification entirely to the developer.

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