Launch Ready cyber security Checklist for AI-built SaaS app: Ready for handover to a small team in B2B service businesses?.

Launch Ready cyber security Checklist for AI-built SaaS app: Ready for handover to a small team in B2B service businesses?

"Ready" does not mean "it works on my machine" or "the demo looked fine." For an AI-built SaaS app handed to a small B2B service team, ready means the team can own it without exposing customer data, breaking email delivery, or losing access during a deployment.

I would call it ready only if these are true:

• Domain and subdomains resolve correctly.
• SSL is valid everywhere.
• Cloudflare is in front of the app with sane caching and DDoS protection.
• No secrets are exposed in the repo, logs, or client bundle.
• Email authentication passes SPF, DKIM, and DMARC.
• Production deployment is repeatable by a small team.
• Monitoring tells you when the app is down before customers do.
• Access is role-based, least privilege, and recoverable if one person leaves.

For a B2B service business, the business risk is not abstract. A bad handover causes broken onboarding, failed quote requests, support load spikes, lost leads, failed invoice emails, and avoidable downtime during sales calls. If your app handles customer data or internal operations, I would treat cyber security as part of launch readiness, not a separate project.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain and DNS | Root domain, www, app subdomain, and redirects all resolve correctly within 60 seconds | Users must land on the right product without confusion | Lost traffic, duplicate sites, broken login links | | SSL everywhere | Valid certs on all public hosts; no mixed content; HSTS enabled | Protects logins and forms from interception | Browser warnings, failed sign-in trust | | Cloudflare protection | WAF on, rate limits set, DDoS protection active | Reduces bot abuse and basic attacks | Spam signups, brute force attempts, downtime | | Secrets handling | Zero exposed secrets in codebase, CI logs, browser bundle | Prevents account takeover and data exfiltration | API abuse, leaked keys, vendor bills | | Email auth | SPF, DKIM, DMARC all pass for sending domain | Keeps transactional email out of spam | Failed password resets and missed alerts | | Auth controls | No critical auth bypasses; session expiry works; password reset is safe | Protects customer accounts and internal admin access | Unauthorized access and data exposure | | Environment separation | Dev/staging/prod isolated with separate keys and data | Stops test changes from hitting real customers | Data corruption and accidental sends | | Logging and monitoring | Uptime checks plus error alerts; p95 API under 500ms on core flows | Lets a small team respond fast | Silent failures and slow conversion | | Backups and rollback | Backup schedule exists; rollback tested once in prod-like env | Limits blast radius of bad deploys | Extended outage or permanent data loss | | Handover docs | Admin access map, deploy steps, incident contacts documented in one place | Makes ownership transfer possible for a small team | Tribal knowledge lock-in |

The Checks I Would Run First

1. Domain routing and redirect behavior

Signal: I want every key URL to land exactly where intended. That means `domain.com`, `www.domain.com`, `app.domain.com`, login links, password reset links, and marketing redirects all work without loops or mixed-host confusion.

Tool or method: I would use browser checks plus `curl -I` against each public URL. I also check redirect chains from ads or old domains because that is where conversion loss hides.

Fix path: If redirects are inconsistent, I standardize one canonical host and force everything else there. I also make sure the app uses the correct public base URL in emails so users do not get broken links.

2. SSL coverage and mixed content

Signal: The browser should show a clean secure connection on every public page. There should be no mixed content warnings for images, scripts, fonts, or API calls.

Tool or method: I use Chrome DevTools Security tab plus a site crawl. If needed I run Lighthouse because poor asset loading often reveals insecure third-party calls too.

Fix path: I replace hardcoded `http://` assets with HTTPS URLs or relative paths. Then I enable HSTS only after confirming every subdomain is stable.

3. Secret exposure review

Signal: There should be zero exposed secrets in Git history snapshots that matter today: API keys, private tokens, service account files, webhook signing secrets. If one secret leaked into client-side code or logs once publicly accessible builds are already risky.

Tool or method: I scan the repo with secret detection tools like Gitleaks or TruffleHog. I also inspect build output and browser bundles because AI-built apps often hide config values there by accident.

Fix path: Rotate any exposed key immediately. Then move secrets into environment variables or managed secret storage and remove them from frontend code entirely.

4. Authentication flow hardening

Signal: Login should require valid credentials only once per session policy. Password reset must be time-limited and single-use. Admin routes must not rely on obscurity.

Tool or method: I test auth with normal user accounts plus deliberate edge cases like expired reset tokens and repeated failed logins. I also inspect authorization checks server-side rather than trusting frontend route guards.

Fix path: Add server-side authorization checks on every sensitive action. Set sane session expiry rules and rate limit login/reset endpoints to reduce brute force risk.

5. Email deliverability controls

Signal: SPF passes for the sender domain. DKIM signs outbound mail. DMARC is set to at least `p=quarantine` once testing is stable. Transactional emails arrive reliably in Gmail and Outlook inboxes.

Tool or method: I verify DNS records directly with a DNS lookup tool and send test messages to multiple providers. This matters because B2B teams depend on email for onboarding, invoices, approvals, alerts.

Fix path: Configure SPF/DKIM/DMARC at the DNS layer before launch day. Then align the `From` domain with the authenticated sending domain so mail does not get filtered as spoofed.

6. Production monitoring and response path

Signal: Uptime monitoring exists for both homepage and core app routes. Error alerts go to someone who will actually respond within business hours. A small team needs alerting that reduces noise instead of creating it.

Tool or method: I check uptime monitors plus application error tracking like Sentry-style tooling. For performance-sensitive flows I look at p95 latency on login and checkout-like actions; core API endpoints should stay under 500ms p95 under normal load.

Fix path: Set alert thresholds only on actionable signals first: downtime, auth errors spike, payment/webhook failures if relevant. Then document who gets paged at 9am local time versus after-hours escalation.

Red Flags That Need a Senior Engineer

1. You found any secret in client-side code or public build output. That is not a cleanup task for later. It means keys may already be usable by attackers or bots.

2. Admin actions are protected only by frontend UI checks. If the server does not enforce authorization every time, users can often bypass controls directly through requests.

3. The app sends production emails from an unverified domain. This causes deliverability failures that look like product bugs but really damage trust and activation rates.

4. Deployments are manual tribal knowledge. If only one person knows how to ship safely, your launch plan has an operational single point of failure.

5. There is no clear rollback path. Without rollback you do not have launch safety; you have hope plus downtime risk.

DIY Fixes You Can Do Today

1. Run a secret scan now. Use Gitleaks or TruffleHog against your repo before another deploy goes out. Rotate anything exposed even if you think it was "just test."

2. Verify your DNS records manually. Check A/AAAA/CNAME records for root domain redirects plus SPF/DKIM/DMARC using your DNS provider's UI or a lookup tool.

3. Turn on Cloudflare basics. Enable proxying for public hosts where appropriate, turn on WAF managed rules if available on your plan level that fits your traffic risk profile more than raw cost-saving does.

4. Audit your admin roles. List who can access prod today. Remove stale accounts immediately and make sure each person has their own login instead of shared credentials.

5. Test password reset end-to-end. Send reset emails to Gmail and Outlook accounts you control. Confirm links expire correctly after use so account recovery cannot be replayed later.

Where Cyprian Takes Over

If your checklist shows gaps across DNS orchestration, email authentication setup complexity two-factor handover risk high enough that you do not want to improvise under deadline then this is exactly where Launch Ready fits.

• Domain setup
• Email setup
• Cloudflare configuration
• SSL issuance
• Deployment verification
• Secrets review
• Monitoring setup
• Handover checklist

How I map failures to deliverables:

| Failure found | What Launch Ready fixes | |---|---| | Broken root/www/app routing | DNS cleanup plus redirect rules | | Mixed content or certificate issues | SSL install plus HTTPS enforcement | | Spam folder email delivery | SPF/DKIM/DMARC configuration | | Exposed config values | Environment variable migration plus secret handling review | | No production visibility | Uptime monitoring plus basic alert routing | | Unclear ownership after launch | Handover checklist with access map |

My recommended path is simple: do not spend three days guessing through DNS records while customer-facing launch dates slip. Buy the sprint when you need production safety fast because one broken deployment can cost more than the service fee in lost leads alone.

If you want this handled properly instead of patched together by trial and error: https://cyprianaarons.xyz https://cal.com/cyprian-aarons/discovery

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: https://owasp.org/www-project-application-security-verification-standard/
• Cloudflare security docs: https://developers.cloudflare.com/security/

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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.*