Ship a SaaS and verify it piece by piece
A developer used Replit Agent to launch a tenant-based SaaS in 15 days, then spent a lot of time checking for security and deployment mistakes.
- What they did
- The developer built a production system for multiple customers by pairing Replit Agent with Architect. They worked from a spec, converted it into markdown, asked Replit to review the plan, cross-checked that plan with Perplexity or Codex, and then had the agent execute the work one task at a time while they kept inspecting the app.
- How it went
- The app was completed, but the quick build hid serious problems. They found row-level security bypasses, OAuth tokens that were encrypted twice, environment variables that reverted, and production accidentally using the dev database. Integrations were still unfinished, and database migrations were still running into trouble with triggers and security-definer functions.
- Tips
- Treat the agent as a builder, not a final reviewer. If you cannot rely on production logs, budget extra time for manual checks of data separation, config, and database behavior.
Try it yourself with Replit Agent
I need to create a [type of product] for [customer type] with separate data for each customer. From this spec: [paste spec], draft a build plan, then audit your own plan and implementation for tenant leakage, row-level security mistakes, bad environment values, migration risks, and any case where production and development might be using the same database. Before you do anything that would send, delete, submit, or change live data, stop and ask for my approval. After each major step, list the checks you completed and the items that still need a human to review.
Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.
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