Launch Ready cyber security Checklist for founder landing page: Ready for handover to a small team in mobile-first apps?.

What "ready" means for a founder landing page

For a mobile-first app landing page, "ready" does not mean "it looks good on my phone." It means a small team can take over the domain, email, deployment, monitoring, and security without guessing how anything works.

I would call it ready when these are true:

• The domain is pointed correctly, with redirects tested and no broken canonical paths.
• SSL is live on every public subdomain.
• Email authentication passes with SPF, DKIM, and DMARC.
• No secrets are exposed in the repo, build logs, or frontend bundle.
• Cloudflare or equivalent protection is active for DNS, caching, and DDoS mitigation.
• Production deploys are repeatable by a small team in under 15 minutes.
• Uptime monitoring and alerting are in place before handover.
• The mobile landing page loads fast enough to convert, with LCP under 2.5s on a typical 4G connection.
• The team receiving it has a handover checklist, not tribal knowledge.

If any of those are missing, you do not have a handover-ready asset. You have a prototype that can break under traffic, waste ad spend, or leak customer data.

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

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain setup | Root domain and www resolve correctly | Users and ads must land on one canonical URL | Broken links, duplicate indexing | | HTTPS everywhere | All pages redirect to SSL with no mixed content | Trust and browser compatibility | Security warnings, form drop-off | | Email auth | SPF, DKIM, DMARC all pass | Protects deliverability and brand trust | Emails hit spam or get spoofed | | Secrets handling | Zero secrets in frontend or repo history | Prevents account takeover and data leaks | Exposed API keys, billing abuse | | Cloudflare protection | DNS proxied where needed with WAF/DDoS rules | Reduces attack surface and downtime risk | Bot traffic overloads origin | | Redirects | Old URLs map cleanly to new ones | Preserves SEO and ad performance | Lost traffic and broken campaigns | | Mobile performance | LCP under 2.5s; CLS under 0.1 | Mobile users decide fast | Lower conversion rate | | Monitoring | Uptime alerts fire within 5 minutes of failure | Small teams need early warning | Outages go unnoticed for hours | | Deployment process | One documented production path exists | Handover should not depend on one person | Release delays and mistakes | | Access control | Least privilege for DNS, hosting, email tools | Limits blast radius if an account is compromised | Full stack takeover from one leaked login |

The Checks I Would Run First

1) Domain resolution and redirect chain

Signal: The root domain resolves consistently to one primary landing page path. `http`, `https`, `www`, and non-www all end at the same canonical destination in one or two hops.

Tool or method: I test with browser dev tools plus `curl -I` against each variant. I also check DNS records in Cloudflare or the registrar to confirm there is no split-brain setup.

Fix path: I choose one canonical domain and force every other variant to redirect there. If the site is behind Cloudflare, I set the correct proxied A or CNAME record and remove conflicting records.

2) SSL coverage and mixed-content scan

Signal: Every public page loads over HTTPS with no browser warnings. No images, scripts, fonts, or API calls are pulled over HTTP.

Tool or method: I run a browser security check plus a quick crawl for mixed content. I also inspect certificate coverage for apex domain and subdomains.

Fix path: I install or renew the certificate at the edge layer first. Then I update hardcoded asset URLs so nothing points to insecure endpoints.

3) Secrets exposure review

Signal: No API keys, private tokens, webhook secrets, or service credentials appear in client-side code, git history surfaced in recent commits, build output, or logs.

Tool or method: I scan the repo with secret detection tools and manually inspect `.env` usage. I also check deployed frontend bundles because many founders accidentally ship keys there.

Fix path: Any exposed secret gets rotated immediately. Then I move secrets into environment variables on the host platform or secret manager and remove them from code entirely.

A simple pattern should look like this:

NEXT_PUBLIC_SITE_URL=https://example.com
MAILER_API_KEY=replace-me

Only public values should use `NEXT_PUBLIC_`. Anything that can send email, access databases, or modify infrastructure must stay server-side.

4) Email deliverability check

Signal: SPF passes for the sending provider; DKIM signs outbound mail; DMARC is present with at least `p=none` during rollout and then tightened later. Test emails land in inboxes instead of spam.

Tool or method: I use MX lookup tools plus actual test sends to Gmail and Outlook. I verify alignment rather than assuming the records are correct because many setups look right but fail authentication.

Fix path: I align the sender domain with the mailing provider exactly as configured. If multiple services send mail from one domain - marketing tool plus app notifications - I define which service owns which subdomain.

5) Cloudflare edge protection review

Signal: DNS is protected by Cloudflare where appropriate; caching rules do not break dynamic pages; DDoS mitigation is active; rate limits exist for forms or login endpoints if any are public.

Tool or method: I inspect Cloudflare dashboard settings plus request logs if available. I test whether static assets are cached while sensitive routes bypass cache correctly.

Fix path: I keep marketing assets cached at the edge but exclude auth callbacks and admin routes. For founder landing pages with lead capture forms only, I still protect form endpoints against bot spikes and repeated submissions.

6) Deployment repeatability check

Signal: A small team can deploy without asking "what did Cyprian do?" There is one documented path from code to production that works twice in a row.

Tool or method: I perform a dry run using current access only. Then I verify environment variables are documented by name only - never values - along with rollback steps.

Fix path: I simplify deployment until it fits one owner account per system. If there are manual steps hidden inside dashboards or local machine instructions only one person knows about them get removed before handover.

Red Flags That Need a Senior Engineer

If you see any of these, DIY usually becomes slower than paying for cleanup:

1. The site works locally but fails only after deployment. That usually means env mismatch, build-time assumptions, or wrong runtime config.

2. You find even one real secret in frontend code. Treat that as an incident because attackers do not need many opportunities.

3. Email goes to spam despite "correct" DNS records. Deliverability failures often come from alignment issues that need careful diagnosis across provider settings.

4. The app has multiple domains with unclear ownership. That creates redirect loops, cookie issues if auth exists later on another route set up by default wrong CDN behavior.

5. Nobody can explain how rollback works. If production breaks during launch week you need recovery in minutes not vague confidence.

DIY Fixes You Can Do Today

1. Create one source of truth document. Write down domain registrar login location hosting provider Cloudflare account email sender platform analytics access and who owns each account.

2. Remove unused DNS records. Delete old A records parked subdomains staging leftovers and anything you cannot explain in one sentence.

3. Check every public URL on mobile. Open home pricing waitlist privacy terms contact form and thank-you page on iPhone Android-sized screens then fix any broken layout overflow or tap target issue immediately.

4. Search your repo for secrets. Look for `.env`, `api_key`, `secret`, `token`, `private_key`, webhook URLs and hardcoded passwords then rotate anything suspicious before launch traffic hits it.

5. Send test emails from real inboxes. Use Gmail Outlook and Apple Mail if possible then confirm SPF DKIM DMARC pass before you announce launch to users or investors.

Where Cyprian Takes Over

Here is how failures map to Launch Ready deliverables:

| Failure found during audit | What I fix in Launch Ready | Time window | |---|---|---| | Domain misrouting or bad redirects | DNS cleanup redirect map canonical URL setup | Hours 1-8 | | Missing SSL or mixed content | Certificate setup edge enforcement asset URL fixes | Hours 1-12 | | Weak email deliverability | SPF DKIM DMARC configuration sender alignment tests | Hours 4-16 | | Exposed secrets or bad env handling | Secret rotation env var cleanup deployment hardening | Hours 4-20 | | No Cloudflare protection | Proxy setup caching rules WAF DDoS baseline controls | Hours 8-24 | | Broken production deploy process | Repeatable deploy checklist rollback notes handover doc | Hours 16-36 | | No monitoring/alerts | Uptime checks alert routing response instructions |-Hours 20-40? |

I would finish by handing over three things:

• A working production setup
• A written access map for the small team
• A concise launch checklist that covers what to watch in the first 72 hours

It is about removing launch risk so your team can own it safely after handoff without calling me every time something changes.

Delivery Map

References

• https://roadmap.sh/cyber-security
• https://roadmap.sh/api-security-best-practices
• https://roadmap.sh/frontend-performance-best-practices
• https://roadmap.sh/code-review-best-practices
• https://roadmap.sh/qa
• https://developers.cloudflare.com/ssl/
• https://developers.cloudflare.com/dns/
• https://support.google.com/a/answer/33786?hl=en

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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.*