Solo developer builds production SaaS in 40 minutes using AI software factory

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A developer describes pastmonday.com, a small but complete SaaS app with authentication, a weekly calendar, Stripe billing, referral credits, file uploads, and an AI chat. The app was built by a 'software factory' of four reusable Claude Code skills that turn a one-page project brief into a shipped product in stages. Its backend runs almost entirely on Neon, which provides Postgres, Auth, and a Data API, with Object Storage and an AI Gateway in private preview that the developer accessed early. Stripe handles payments and the developer's own cluster hosts the containers. The developer says the skills are publicly available on GitHub and promotes the approach through a related video.

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