Launch Ready cyber security Checklist for AI-built SaaS app: Ready for app review in marketplace products?.

What "ready" means for an AI-built SaaS app in marketplace review

For a marketplace product, "ready" does not mean the app feels finished. It means the reviewer can sign up, verify the core workflow, and find no obvious security, privacy, or reliability risk.

If I were self-assessing an AI-built SaaS app, I would want these basics true before submitting:

• No exposed secrets in code, logs, or client-side bundles.
• Authentication works every time, including password reset, email verification, and session expiry.
• Authorization blocks users from seeing or editing data they do not own.
• Production domain, SSL, redirects, and email delivery are working.
• The app loads fast enough to avoid looking broken. I target LCP under 2.5s on mobile and p95 API latency under 500ms for key routes.
• Monitoring is on, so if review traffic or a spike breaks something, I know within minutes.
• The reviewer can complete the main flow without hitting dead ends, 500s, or missing environment variables.

For marketplace products, failure usually shows up as review delay, rejected listing, broken onboarding, support load during launch week, or leaked customer data. If any of those are possible today, it is not ready.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain and DNS | Root domain and www resolve correctly; subdomains point to the right app | Reviewers need a stable public URL | Broken access, failed verification | | SSL | HTTPS active with no mixed content | Marketplace trust and browser security | Warning screens, blocked assets | | Redirects | HTTP to HTTPS and non-canonical domains redirect once only | Prevents duplicate URLs and SEO issues | Confusing links, auth callback errors | | Auth flow | Sign up, login, logout, reset password all work | Reviewers test the main path first | Immediate rejection or manual follow-up | | Authorization | Users cannot access another user's data by changing IDs | Core SaaS security control | Data exposure and trust loss | | Secrets handling | Zero secrets in frontend code or public repos | Stops credential theft | Cloud bills, account takeover | | Email deliverability | SPF/DKIM/DMARC pass for sending domain | Password resets and invites must arrive | Users cannot verify accounts | | Monitoring | Uptime checks and error alerts are active | You need early warning during review traffic | Silent outages and slow incident response | | Caching/CDN/WAF | Cloudflare active with sane caching rules and DDoS protection | Protects launch traffic and reduces latency | Slow pages or avoidable downtime | | Handover docs | Clear checklist for deploys, env vars, rollback, contacts | Keeps launch support manageable | Repeated mistakes and support churn |

The Checks I Would Run First

1. Public surface check

• Signal: The app opens on the canonical domain over HTTPS with no browser warnings.
• Tool or method: Manual browser test plus `curl -I` against root domain, www variant, and key subdomains.
• Fix path: Set DNS records correctly, force HTTPS at Cloudflare or host level, then verify redirects only happen once.

2. Authentication and session check

• Signal: Sign up creates a real account; login persists correctly; logout clears session; password reset reaches inbox.
• Tool or method: End-to-end test in a fresh browser profile plus mailbox testing with Gmail/Outlook.
• Fix path: Repair auth callbacks, confirm cookies use Secure and HttpOnly flags where appropriate, and validate session expiry behavior.

3. Authorization boundary check

• Signal: A logged-in user cannot fetch another user's records by changing an ID in URL or API request.
• Tool or method: Inspect network requests in DevTools and replay them with modified identifiers using Postman or curl.
• Fix path: Enforce server-side ownership checks on every sensitive route. Never trust client-side filtering alone.

4. Secrets exposure check

• Signal: No API keys, private tokens, database URLs with credentials, webhook secrets, or service account files appear in frontend bundles or public repos.
• Tool or method: Search repo history plus run secret scanners like GitHub secret scanning or TruffleHog.
• Fix path: Rotate exposed credentials immediately. Move secrets into environment variables and deploy-time secret stores.

5. Email authentication check

• Signal: SPF passes for your sender; DKIM signs mail; DMARC policy is present and aligned.
• Tool or method: Send test email to Gmail and inspect headers; use MXToolbox for validation.
• Fix path: Publish correct DNS records for SPF/DKIM/DMARC before asking users to verify accounts or receive resets.

6. Observability check

• Signal: Uptime monitor is live; error tracking catches exceptions; logs include request IDs but not sensitive data.
• Tool or method: Trigger a harmless test error in staging and confirm alert delivery to email/Slack.
• Fix path: Add uptime monitoring for homepage plus critical auth endpoints. Connect error tracking before launch traffic starts.

Red Flags That Need a Senior Engineer

1. Secrets already shipped to production If a public bundle contains API keys or a repo has leaked credentials in history, this is not a small cleanup. I would rotate everything first because one exposed secret can become account takeover or unexpected cloud spend.

2. Broken ownership checks If one user can see another user's data by changing an ID parameter, that is a real security flaw. Reviewers may not catch it immediately, but customers eventually will.

3. Auth works locally but fails in production This usually means bad redirect URLs, cookie settings mismatch between localhost and production domains, or environment variables missing in deploy. That creates failed sign-ins during review and support tickets on day one.

4. No monitoring before launch If you cannot tell me when the app goes down or starts throwing 500s at p95 above 500ms equivalent load behavior matters less than visibility here. Without monitoring you are blind during marketplace review traffic spikes.

5. AI features can access too much If your assistant can read internal notes, hidden prompts without controls near it becomes prompt injection risk plus data exfiltration risk. This needs red teaming before reviewers poke at it.

DIY Fixes You Can Do Today

1. Run a secret scan now Search your repo for `.env`, API keys patterns like `sk-`, `pk_`, `AIza`, `Bearer`, private webhooks. If anything real appears in source control history after deployment prep started yesterday rotate it now.

2. Test your signup flow from scratch Use an incognito window with a fresh email address. Confirm signup email arrives within 2 minutes and password reset also arrives within 2 minutes.

3. Verify DNS records Check that root domain points to the correct host and that www redirects to canonical URL exactly once. Broken redirects waste review time fast.

4. Turn on Cloudflare protections Enable SSL mode correctly at the edge where applicable cache static assets set basic WAF rules if available and make sure DDoS protection is active.

5. Add one uptime check today Monitor homepage login page and one authenticated health endpoint if possible. Even a simple alert beats discovering downtime from angry users.

A minimal DMARC baseline looks like this:

v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com

That is not final policy forever but it is better than having no policy while you validate SPF/DKIM alignment.

Where Cyprian Takes Over

If your checklist failures cluster around deployment safety rather than product logic itself Launch Ready is the right fix path.

• DNS setup for root domain www subdomains
• Redirect cleanup so users land on one canonical URL
• Cloudflare setup including SSL caching basic DDoS protection
• Production deployment of the AI-built SaaS app
• Environment variables audit so nothing critical is missing
• Secret handling review plus rotation guidance if needed
• SPF DKIM DMARC setup for reliable sending
• Uptime monitoring so launch issues are visible fast
• Handover checklist so you know what was changed

How I map failures to action:

• Broken domain or SSL -> fix DNS Cloudflare certificates redirects first
• Email failing -> publish SPF DKIM DMARC then retest inbox delivery
• Missing env vars -> rebuild deployment config and verify runtime boot
• Exposed secrets -> rotate credentials then redeploy cleanly
• No monitoring -> add alerts before more traffic hits the app

My recommendation is simple: do not submit to marketplace review until the public surface auth flow email delivery secrets handling and monitoring all pass once end-to-end from scratch on production URLs.

References

• roadmap.sh cyber security best practices: https://roadmap.sh/cyber-security
• roadmap.sh API security best practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh code review best practices: https://roadmap.sh/code-review-best-practices
• OWASP ASVS overview: https://owasp.org/www-project-application-security-verification-standard/
• Cloudflare SSL/TLS documentation: https://developers.cloudflare.com/ssl/

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Take the next step

If this is a problem in your product right now, here is what to do next:

• [Use the free Cyprian tools](/tools) - estimate cost, score app risk, check launch readiness, or pick the right service sprint.

• [Book a discovery call](/contact) - I will tell you honestly whether you need a sprint or if you can DIY the next step.

*Written by Cyprian Tinashe Aarons - senior full-stack and AI engineer helping founders rescue, launch, automate, and scale AI-built products.*