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

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

For a marketplace SaaS product, "ready" does not mean the app only works on your laptop or in a private beta. It means a stranger can land on the domain, sign up, verify email, log in, use the core flow, and not expose customer data, break billing, or trigger support chaos.

For this outcome, I would define ready as:

• Domain resolves correctly with HTTPS enforced.
• Email deliverability works with SPF, DKIM, and DMARC passing.
• Production secrets are not in code, logs, or client-side bundles.
• Auth is protected against obvious bypasses, weak sessions, and broken access control.
• Monitoring alerts you before customers do.
• The app can handle real traffic spikes without timing out or leaking data.

If your app fails any of these, it is not ready for marketplace traffic. It may still be a good prototype, but it is not production-safe.

The goal is simple: get your AI-built SaaS safe enough to accept production traffic without turning launch day into a fire drill.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | HTTPS everywhere | All pages redirect to HTTPS with valid SSL | Protects logins and sessions | Browser warnings, dropped trust, session theft | | DNS correct | Root domain and subdomains resolve to the right targets | Users must reach the right app and email services | Outage at launch, broken redirects | | Email auth passes | SPF, DKIM, DMARC all pass | Marketplace products rely on reliable onboarding emails | Password resets fail, emails land in spam | | No exposed secrets | Zero API keys or private tokens in repo or frontend | Prevents account takeover and cloud abuse | Data breach, billing fraud, service abuse | | Auth and access control | Users only see their own records and org data | Marketplace apps often have multi-tenant risk | Cross-account data exposure | | Rate limiting exists | Login and API endpoints are throttled | Stops brute force and abuse traffic | Credential stuffing, cost spikes | | Cloudflare enabled | DDoS protection, caching rules, WAF basics active | Protects uptime during launch traffic spikes | Slow site, downtime, bot abuse | | Production deployment verified | Build matches live behavior with no hidden dev config | Prevents "works locally" failures | Broken onboarding, wrong env vars | | Monitoring active | Uptime checks and alerting are configured | You need fast detection when something breaks | Long outages before anyone notices | | Handover complete | Owner knows domains, env vars, rollback steps | Avoids dependency on one developer forever | Delayed fixes and operational confusion |

The Checks I Would Run First

1. Domain and redirect chain

Signal: Your root domain should resolve cleanly to the live app in under 2 redirects. HTTP should force HTTPS. Subdomains like `app.` or `api.` should point where you expect.

Tool or method: I check DNS records directly in the registrar and confirm behavior with `curl -I` plus browser testing from incognito mode.

Fix path: If redirects loop or point to old hosting, I fix DNS first. Then I set canonical host rules so one version of the site wins. This avoids duplicate content issues and broken login callbacks.

2. SSL certificate and mixed content

Signal: The padlock must be valid on every public page. No scripts, images, fonts, or API calls should load over HTTP.

Tool or method: I use browser dev tools plus SSL checks from Cloudflare or Qualys-style scanners. I also inspect console warnings for mixed content.

Fix path: If assets still load over HTTP, I update asset URLs and force secure delivery at the CDN layer. Mixed content is small on paper but huge in practice because it kills trust fast.

3. Secrets exposure check

Signal: No API keys should appear in frontend code, Git history snapshots that are still public-facing risks, logs visible to users/admins by mistake, or environment dumps.

Tool or method: I scan the repo for secret patterns and review build artifacts. I also check whether any client bundle includes values that should stay server-side.

Fix path: If a secret is exposed even once publicly, I rotate it immediately. Then I move all sensitive values into server-only environment variables and lock down least privilege access.

4. Auth boundary review

Signal: A logged-in user should never be able to view another user's data by changing an ID in the URL or request body. Admin-only actions must stay admin-only.

Tool or method: I test direct object reference cases manually and inspect authorization checks at the service layer.

Fix path: If access control lives only in the UI button state or frontend logic then it is broken by design. I move enforcement into backend middleware or policy checks so the server decides every time.

5. Email deliverability setup

Signal: SPF passes for your sending provider. DKIM signs outbound mail correctly. DMARC is present with at least `p=none` during setup and then tightened once stable.

Tool or method: I verify DNS records with mail tester tools and confirm actual delivery to Gmail and Outlook inboxes.

Fix path: If onboarding emails go to spam or fail entirely then activation drops hard. For marketplace products this usually means lost signups before they ever become customers.

A minimal DMARC example looks like this:

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

6. Monitoring and alerting baseline

Signal: You have uptime checks on homepage login page and key API endpoints. Alerts reach email or Slack within minutes of failure.

Tool or method: I set synthetic checks plus basic application logging review. I also test one failure path intentionally to confirm alerts actually fire.

Fix path: If nobody gets notified when deploys fail or routes return 500s then you are flying blind. I add monitoring before launch because post-launch debugging costs more support hours than setting it up now.

Red Flags That Need a Senior Engineer

1. You do not know where secrets live If nobody can tell me where API keys are stored today then there is already risk of leakage. This becomes urgent when payment providers, AI model keys, database credentials, or email credentials are involved.

2. Your app has multi-tenant data but no real authorization tests Marketplace SaaS apps often look fine until one customer sees another customer's records. That is a business-ending bug because it becomes a trust issue as soon as support tickets start arriving.

3. Deployments require manual heroics If launch requires SSHing into servers at midnight or editing production files by hand then you do not have a repeatable release process. That creates downtime risk every time you ship.

4. Email is "working" but not verified Many founders assume email works because they received one test message once. In reality SPF/DKIM/DMARC failures can quietly destroy activation rates while you keep spending on ads.

5. You cannot explain rollback If something breaks after deploy and your answer is "we will figure it out live" then production traffic is too risky already. A senior engineer should define rollback before launch day arrives.

DIY Fixes You Can Do Today

1. Turn on HTTPS enforcement Make sure every request redirects to HTTPS at the CDN or hosting layer first thing today. If your platform supports it natively then enable HSTS after confirming nothing breaks on subdomains.

2. Rotate any key you have ever pasted into chat Assume anything shared casually may be compromised later through screenshots or copied notes. Rotate exposed keys now rather than waiting for proof of abuse later.

3. Remove admin data from frontend responses Check whether API responses include fields users do not need such as internal flags, provider tokens, raw logs, or billing metadata. If yes then strip them server-side before shipping more traffic through them.

4. Verify SPF/DKIM/DMARC before sending more signup emails Use your email provider's DNS instructions exactly as written rather than guessing record names from old blog posts. One bad record can push all onboarding mail into spam folders for days.

5. Add basic uptime monitoring now Set up checks for homepage availability plus login plus one critical API route today even if everything else stays messy for now. A cheap alert beats discovering an outage from angry users on social media.

Where Cyprian Takes Over

Here is how Launch Ready maps directly to failures found during this checklist:

| Failure found | What I fix in Launch Ready | |---|---| | Broken DNS or redirect chain | Domain setup across root domain and subdomains | | SSL warnings or mixed content | SSL enforcement plus secure asset delivery | | Email failing inbox placement | SPF/DKIM/DMARC setup and validation | | Secrets visible anywhere risky | Environment variables cleanup plus secret handling review | | App vulnerable behind public traffic spike | Cloudflare configuration including caching and DDoS protection | | Production deploy differs from local behavior | Production deployment verification | | No visibility after launch | Uptime monitoring setup plus handover checklist |

Delivery window: 48 hours.

Includes: DNS setup, redirects, subdomains, Cloudflare configuration, SSL enforcement, caching rules, DDoS protection, SPF/DKIM/DMARC, production deployment, environment variables, secrets handling, uptime monitoring, and handover checklist.

My approach is opinionated: I would rather ship a smaller app that is safe than push a larger app that leaks data under marketplace traffic pressure. That trade-off saves you from support load, failed onboarding, app store style rejection patterns, and wasted ad spend on a product that cannot hold up under real users.

References

• roadmap.sh code review best practices: https://roadmap.sh/code-review-best-practices
• roadmap.sh API security best practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh cyber security: https://roadmap.sh/cyber-security
• OWASP ASVS: https://owasp.org/www-project-application-security-verification-standard/
• Cloudflare SSL/TLS docs: 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.*