Launch Ready cyber security Checklist for founder landing page: Ready for app review in marketplace products?.

What "ready" means for a founder landing page aimed at app review in a marketplace

For this product, "ready" does not mean pretty. It means the landing page and its supporting infrastructure will survive marketplace review, handle real traffic, and not expose your product to avoidable security or email failures.

If I were self-assessing, I would want to see these outcomes before submitting:

• The domain resolves correctly with HTTPS only.
• Email authentication passes with SPF, DKIM, and DMARC.
• No secrets are exposed in the frontend, repo, or deployment logs.
• Cloudflare is active with basic DDoS protection and caching.
• Redirects, subdomains, and canonical URLs are consistent.
• Monitoring is live so I know if the site goes down during review.
• The page loads fast enough to avoid looking broken or untrustworthy, with LCP under 2.5s on mobile for the main landing page.

For marketplace products, app review failure often comes from weak trust signals: broken links, inconsistent branding, missing policy pages, bad email deliverability, or a site that looks unfinished. Cyber security matters here because review teams and users both treat technical sloppiness as risk.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | HTTPS enforced | All traffic redirects to SSL with no mixed content | Reviewers expect a secure domain | Trust drops, browser warnings appear | | Domain ownership clean | Root domain and www/subdomain resolve intentionally | Avoids confusion and phishing risk | Wrong brand URL gets indexed or shared | | SPF/DKIM/DMARC passing | All three authenticate mail successfully | Protects inbox placement and brand trust | Emails land in spam or fail entirely | | No exposed secrets | Zero API keys or private tokens in frontend or repo | Prevents account abuse and data leaks | Billing abuse, data exposure, service compromise | | Cloudflare active | DNS proxied where appropriate with WAF/DDOS basics enabled | Reduces attack surface and downtime risk | Easy DDoS target, slower response times | | Safe redirects | 301s are consistent and loop-free | Keeps SEO and review links stable | Broken navigation, redirect loops | | Production deployment verified | Live build matches intended release branch/tag | Prevents staging mistakes in review flow | Reviewers see test data or broken UI | | Monitoring enabled | Uptime alerts fire within 1 to 5 minutes | You need fast failure detection during launch | Outages go unnoticed for hours | | Privacy/legal pages linked | Privacy policy and terms are visible from footer/header | Marketplace reviewers often check this | Rejection or delayed approval | | Mobile performance acceptable | LCP under 2.5s, CLS under 0.1 on key page | Mobile is where reviewers and users judge quality first | Higher bounce rate and lower conversion |

The Checks I Would Run First

1) DNS and domain routing

Signal: The root domain, www version, and any subdomains all resolve exactly as intended. There should be no stray records pointing to old hosts or temporary builders.

Tool or method: I would inspect DNS records directly in Cloudflare or your registrar panel, then test with `dig`, `nslookup`, and browser checks for `http`, `https`, `www`, and non-www versions.

Fix path: Remove stale A/CNAME records, force one canonical domain, set 301 redirects from all alternates to the main URL, and verify that marketplace links point to the same final destination every time.

2) SSL and mixed content

Signal: The browser shows a valid certificate chain with no warnings. No images, scripts, fonts, or API calls load over HTTP.

Tool or method: I would use Chrome DevTools Security tab, SSL Labs testing, and a crawl for mixed-content warnings in the console.

Fix path: Enable full SSL in Cloudflare if appropriate for your stack, install a valid origin certificate if needed, replace hardcoded HTTP assets with HTTPS URLs, and block insecure resources at the source.

3) Email authentication

Signal: SPF passes for your sending provider. DKIM signs outgoing mail. DMARC is present with at least `p=quarantine` once you confirm legitimate mail flow.

Tool or method: I would send test emails to Gmail and Outlook accounts, inspect headers, and validate DNS TXT records using MXToolbox or similar checks.

Fix path: Add the correct SPF record only once per domain setup. Configure DKIM through your email provider. Start DMARC in monitoring mode if you are unsure what mail streams exist.

A minimal DMARC record often looks like this:

v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com; adkim=s; aspf=s

4) Secrets exposure scan

Signal: No API keys appear in source files, build artifacts, browser bundles, public logs, screenshots of env files, or Git history that is still reachable from the repo.

Tool or method: I would scan with GitHub secret scanning equivalents if available, run `gitleaks` locally if possible, inspect `.env` handling in CI/CD, and search compiled frontend assets for suspicious strings.

Fix path: Move all secrets server-side only. Rotate anything already exposed. Replace long-lived keys with scoped tokens where possible. Add `.env` files to `.gitignore`, scrub history if needed, and store production secrets in your host's secret manager.

5) Deployment integrity

Signal: The live site matches the approved release branch. There is no staging banner on production unless intentionally added. Build version is known.

Tool or method: I would compare commit hashes between local branch state and deployed artifact metadata. Then I would verify environment-specific settings by checking runtime variables on the host side.

Fix path: Lock deployment to one branch or tag. Separate preview from production environments. Add a visible version stamp internally so you can trace what was shipped when support tickets arrive.

6) Monitoring and alerting

Signal: You get an alert when uptime drops below target availability. For a launch window like this service covers in 48 hours after setup changes begin to roll out quickly enough that downtime is visible within minutes.

Tool or method: I would configure uptime checks against the landing page plus one critical asset endpoint. I would also test alert delivery by forcing a controlled failure.

Fix path: Set up external monitoring through UptimeRobot-like tooling or your cloud provider's health checks. Route alerts to email plus Slack if you have it. Make sure someone owns the inbox after handover.

Red Flags That Need a Senior Engineer

If I see any of these during an audit, I stop treating this as a DIY cleanup task:

1. Secrets have already been committed publicly

• This is not just cleanup work.
• It means rotation strategy matters more than fixing the current file tree.

2. The app has multiple domains pointing at different environments

• This creates review confusion.
• It also increases phishing risk because users cannot tell which URL is official.

3. Email deliverability is failing

• If SPF/DKIM/DMARC are broken now, support tickets will follow.
• Marketplace approvals can stall when verification emails do not arrive reliably.

4. The deployment pipeline is unclear

• If nobody can explain how code reaches production safely,

then one wrong push can break launch day.

• That becomes downtime plus lost conversion spend.

5. Cloudflare was added without understanding origin security

• A misconfigured proxy can hide issues until traffic spikes.
• Worse: it can expose origin IPs or create false confidence while attacks still hit the backend directly.

DIY Fixes You Can Do Today

These are safe moves you can make before bringing me in:

1. Set one canonical domain

• Choose either `www` or non-www.
• Redirect everything else there with a permanent 301.

2. Turn on HTTPS everywhere

• Force SSL in your host settings if available.
• Check every image link and script tag for HTTP leftovers.

3. Publish your privacy policy

• Put it in the footer.
• Make sure it matches how you actually collect data on forms and analytics tools.

4. Check your email DNS records

• Confirm SPF exists once.
• Confirm DKIM is enabled by your provider.
• Add DMARC monitoring even if you start with `p=none`.

5. Remove secrets from frontend code

• Search for `api_key`, `secret`, `token`, `private_key`.
• If anything sensitive is visible in browser dev tools,

assume it is already public.

Where Cyprian Takes Over

This service exists for the exact gap between "I built it" and "I can safely submit it."

Here is how checklist failures map to Launch Ready deliverables:

| Failure area | What I do inside Launch Ready | Timeline | |---|---|---| | Domain confusion | Clean DNS setup, canonical redirects, subdomain mapping | Hours 1-8 | | SSL issues / mixed content | Certificate validation + forced HTTPS + asset cleanup guidance | Hours 1-12 | | Email auth failures | SPF/DKIM/DMARC setup validation across providers | Hours 6-18 | | Secrets exposure risk | Audit env vars, frontend bundles, repo references; recommend rotations | Hours 8-20 | | Weak Cloudflare protection | Configure DNS proxying where safe, caching rules, DDoS basics | Hours 10-24 | | Bad deployment hygiene | Verify production build path + environment separation + rollback notes | Hours 12-28 | | Missing monitoring | Set uptime checks + alert routing + handover instructions | Hours 18-32 | | Launch handoff gaps | Deliver checklist of what was changed plus what still needs owner action later when applicable on external systems outside direct access scope; final handover by hour 48 |

One rejected submission can cost more than that in lost momentum alone.

For founders shipping marketplace products, this package is designed to remove launch blockers fast:

• Delivery: 48 hours
• Includes: DNS cleanup,

redirects, subdomains, Cloudflare, SSL, caching, DDoS protection, SPF/DKIM/DMARC, production deployment, environment variables, secrets handling, uptime monitoring, and handover checklist

If you already have a working landing page but need it made review-safe quickly, this is the shortest path I would take before submitting again.

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 Cheat Sheet Series: https://cheatsheetseries.owasp.org/
• 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.*