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

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

"Ready" does not mean the app looks finished. It means a buyer can land on your product, trust the domain, sign up, pay, use the core workflow, and not hit avoidable security or delivery failures.

For a marketplace product, I would call it ready for paid acquisition only if these are true:

• The app is deployed on a production domain with SSL, redirects, and subdomains working.
• Email deliverability is set up with SPF, DKIM, and DMARC passing.
• No secrets are exposed in the frontend, repo, logs, or build output.
• Authentication and authorization block cross-account access.
• Monitoring alerts you when uptime drops or errors spike.
• Caching, Cloudflare, and basic hardening are in place so traffic does not collapse under ads.
• The onboarding path works on mobile and desktop without broken states.
• Core pages load fast enough for paid traffic, with LCP under 2.5s on mobile for key landing pages.

If any of those fail, you are not ready for paid acquisition. You are buying traffic into leaks: support load, failed signups, broken trust, wasted ad spend, and possible customer data exposure.

It covers domain, email, Cloudflare, SSL, deployment, secrets, monitoring, and handover so you can launch without guessing where the risk is.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain + DNS | Root domain and www resolve correctly; subdomains intentional | Trust and routing | Users hit wrong app or stale environment | | SSL + redirects | HTTPS only; 301 from HTTP to HTTPS and non-canonical URLs | Security and SEO | Browser warnings; duplicate content; lower conversion | | Email auth | SPF, DKIM, DMARC all pass | Deliverability | Signup emails and invoices land in spam | | Secrets handling | Zero exposed secrets in repo/build/client code | Data protection | Account takeover or API abuse | | Authz checks | Users cannot read or edit other users' data | Marketplace isolation | Cross-tenant data leak | | Rate limiting | Login/signup/API abuse throttled | Fraud and cost control | Bot signups and brute force attacks | | Cloudflare protection | WAF/CDN/DDoS enabled where relevant | Traffic resilience | Ads drive traffic into downtime | | Monitoring | Uptime + error alerts active; owner notified within 5 minutes | Fast incident response | Problems stay hidden for hours | | Performance baseline | Key pages LCP under 2.5s; API p95 under 500ms on normal load | Paid acquisition conversion rate | Bounce rate rises; CAC gets worse | | Handover readiness | Deployment steps documented; rollback path known | Operational continuity | One change breaks production with no recovery |

The Checks I Would Run First

1) Domain and DNS sanity check

Signal: The root domain loads the correct production app, www redirects cleanly or vice versa, and subdomains like api., app., or dashboard. point to the intended service.

Tool or method: I check DNS records in the registrar or Cloudflare panel, then test the live routes in a browser and with curl. I also verify there is no split-brain setup where staging and production both answer public traffic.

Fix path: I normalize canonical URLs first. Then I set A/AAAA/CNAME records properly, remove stale records from old deployments, and confirm redirect rules do not loop.

2) SSL and redirect chain check

Signal: Every public page serves over HTTPS with no mixed content warnings. HTTP requests return a single 301 to the canonical HTTPS URL.

Tool or method: I inspect browser security warnings, run curl -I against key URLs, and check Cloudflare SSL mode. I also look for hardcoded http:// asset links inside the app.

Fix path: I force HTTPS at the edge, update asset URLs to relative or https links only if needed, then verify login forms and payment pages never downgrade security.

3) Email deliverability check

Signal: SPF passes for your sending provider. DKIM signs outbound mail. DMARC passes with a policy that at least monitors failures.

Tool or method: I send test emails to Gmail and Outlook accounts and inspect headers. I also use DNS lookup tools to confirm TXT records are correct.

Fix path: I add SPF for exactly the providers you use. Then I enable DKIM signing at the provider level and publish DMARC with reporting enabled. If this is wrong, your signup emails may never reach users who just paid you.

Example DMARC starter record:

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

4) Secrets exposure check

Signal: No API keys, private tokens, database URLs with credentials, service account files, or admin passwords exist in client code or public repos.

Tool or method: I search the repository history, current codebase, environment files, CI logs, browser bundles, and build artifacts. I also inspect runtime logs for accidental secret printing.

Fix path: I move all sensitive values to environment variables or secret managers immediately. Then I rotate anything that may have already been exposed. If a secret was committed once publicly, assume it is compromised until rotated.

5) Authorization boundary check

Signal: A signed-in user cannot access another user's project by changing an ID in the URL or API request.

Tool or method: I test direct object reference cases manually by editing request payloads in DevTools or Postman. In marketplace products this is critical because tenant separation is often weak in AI-built apps.

Fix path: I enforce authorization server-side on every read/write action. The rule is simple: ownership must be checked against session identity before any data leaves the database layer.

6) Monitoring and incident visibility check

Signal: Uptime alerts fire within 5 minutes of outage. Error spikes are visible before customers complain.

Tool or method: I verify uptime checks from an external monitor plus application error tracking such as Sentry or equivalent. Then I confirm notifications go to a real inbox or Slack channel that someone watches daily.

Fix path: I connect one uptime monitor per critical route plus one error tracker per environment. If there is no alerting now, you do not have observability - you have hope.

Red Flags That Need a Senior Engineer

1) You see secrets in Git history or pasted into AI prompts. This is not a cleanup task for a founder on a deadline. Keys need rotation order planning so production does not break while you fix exposure risk.

2) Your app uses custom auth logic across multiple roles or tenants. Marketplace products often fail here because one bad permission check becomes a data leak across customers.

3) Email sending is inconsistent across Gmail, Outlook, Yahoo. That usually means DNS authentication is incomplete or misaligned with your sender configuration.

4) Production deploys are manual and scary. If one bad deploy can take down checkout or onboarding for hours while you figure out rollback steps, paid acquisition will expose that weakness fast.

5) You cannot tell what broke when signups stop converting. No logs plus no monitoring means support tickets become your alerting system. That is too expensive once ads start running.

DIY Fixes You Can Do Today

1) Turn on Cloudflare proxying for your main domain. This gives you basic caching protection plus DDoS shielding before traffic hits origin directly.

2) Force one canonical URL structure. Pick either www or non-www and redirect everything else to it with one clean 301 chain.

3) Audit your `.env` files right now. If anything sensitive appears in frontend code variables prefixed for browser use only when they should be server-only then move them immediately.

4) Test email headers from a real inbox. Send signup verification mail to Gmail first. If SPF/DKIM/DMARC fail there now they will fail at scale later too.

5) Add one external uptime monitor today. Even a simple ping monitor on your homepage plus login page gives you earlier warning than waiting for user complaints.

Where Cyprian Takes Over

Here is how failures map to deliverables:

| Failure area | What I fix in Launch Ready | Timeline | |---|---|---| | Broken DNS / wrong subdomains | Domain setup,dns records,www/root redirects,intended subdomain routing | Hours 1-8 | | Mixed content / weak SSL setup | Cloudflare config,TLS mode,caching rules,HSTS-safe redirect behavior | Hours 1-8 | | Spammy email delivery | SPF,DKIM,and DMARC setup plus sender alignment checks | Hours 4-12 | | Exposed secrets / unsafe env handling | Environment variables,secrets cleanup,replacement,and rotation plan | Hours 6-18 | | Production deploy risk | Deployment verification,release validation,and rollback notes | Hours 10-24 | | No monitoring / blind spots | Uptime monitoring,error alerts,and basic incident handover checklist | Hours 18-30 | | Missing handover docs | Production handover checklist with owner actions,next steps,and known risks | Hours 30-48 |

My opinion: if you are spending money on marketplace ads before these basics are done,you are paying to discover bugs publicly. That usually costs more than the fix itself through refunds,support hours,and lost trust.

Launch Ready is intentionally narrow because that is what founders need most right before launch:

• Delivered in 48 hours
• Includes DNS
• Includes redirects
• Includes subdomains
• Includes Cloudflare
• Includes SSL
• Includes caching
• Includes DDoS protection
• Includes SPF/DKIM/DMARC
• Includes production deployment
• Includes environment variables
• Includes secrets review
• Includes uptime monitoring
• Includes handover checklist

If your product already has traction but feels risky to put behind paid acquisition,this sprint makes it safe enough to spend without guessing where it will fail first.

References

For practical standards,I would anchor this work against these sources:

1) Roadmap.sh Code Review Best Practices https://roadmap.sh/code-review-best-practices

2) Roadmap.sh API Security Best Practices https://roadmap.sh/api-security-best-practices

3) Roadmap.sh Cyber Security https://roadmap.sh/cyber-security

4) Cloudflare Docs - SSL/TLS Overview https://developers.cloudflare.com/ssl/

5) OWASP Cheat Sheet Series - Authentication Cheat Sheet https://cheatsheetseries.owasp.org/cheatsheets/Authentication_Cheat_Sheet.html

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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.*