Launch Ready cyber security Checklist for founder landing page: Ready for first 100 users in B2B service businesses?.

Launch Ready cyber security Checklist for founder landing page: Ready for first 100 users in B2B service businesses?

"Ready" for a founder landing page is not "the page loads on my laptop." For the first 100 users, ready means a stranger can land, trust the business, submit a form, and receive a reply without your site leaking data, breaking email deliverability, or getting flagged by browsers or spam filters.

For this product, I would define ready as:

• Domain resolves correctly with HTTPS on every path.
• No exposed secrets in the frontend, repo, or deployment logs.
• Contact forms work and do not leak submissions.
• SPF, DKIM, and DMARC all pass for outbound email.
• Cloudflare is protecting the site with basic WAF and DDoS controls.
• Monitoring alerts you within 5 minutes if the site goes down.
• The landing page loads fast enough to convert, with LCP under 2.5s on mobile.
• There are no critical auth bypasses because there should be no hidden admin surface exposed to the public.
• Redirects and subdomains are intentional, not accidental attack paths.
• You have a handover checklist so the business is not dependent on tribal knowledge.

If any one of those fails, you do not have a launch-ready landing page. You have a prototype that can still waste ad spend, trigger support issues, or create avoidable security risk.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | HTTPS everywhere | All pages force SSL with no mixed content | Protects trust and login/session integrity | Browser warnings, form drop-off, SEO damage | | DNS clean-up | Root domain and www resolve correctly | Prevents broken traffic paths | Lost leads and inconsistent branding | | SPF/DKIM/DMARC | All three pass on test emails | Keeps outreach out of spam | Missed replies and poor deliverability | | Secrets removed | Zero secrets in code or build logs | Stops credential theft | Account takeover and data exposure | | Cloudflare enabled | WAF, DDoS protection, caching on | Reduces attack surface and load | Outages from bots or traffic spikes | | Form validation | Server-side validation on all inputs | Blocks abuse and bad data | Spam floods and injection risk | | Monitoring active | Uptime checks + alerting within 5 min | Speeds incident response | Downtime goes unnoticed | | Redirects verified | Only approved redirects exist | Prevents phishing/open redirect abuse | User trust loss and security issues | | Subdomains reviewed | No orphaned or public admin subdomains | Reduces attack surface | Exposed tools or staging leaks | | Handover complete | Owner can manage DNS, email, deploys | Avoids dependency bottlenecks | Launch delays and support overload |

The Checks I Would Run First

1. I would verify there are no exposed secrets

The signal is simple: if I can find API keys, private tokens, webhook secrets, or service credentials in the repo, frontend bundle, deployment logs, or browser source map files, the launch is not safe. For a founder landing page aimed at first 100 users, zero exposed secrets is the baseline.

I would check:

• Git history
• `.env` files
• Build output
• Source maps
• Hosting logs
• Browser network requests

My fix path is: 1. Rotate anything exposed immediately. 2. Move secrets into server-side environment variables. 3. Remove source maps from public production builds unless there is a clear reason to keep them. 4. Add secret scanning in CI so this does not happen again.

2. I would test email deliverability end to end

The signal is whether outbound email passes SPF, DKIM, and DMARC with aligned domains. If these fail, your contact form confirmations and sales replies will land in spam or get rejected.

I would use:

• MXToolbox
• Google Postmaster Tools
• A real inbox test from Gmail and Outlook
• Email header inspection

My fix path is: 1. Set SPF to include only approved senders. 2. Enable DKIM signing at your mail provider. 3. Publish DMARC with at least `p=none` first if you need monitoring, then move to `quarantine` or `reject`. 4. Test every sender identity used by the business.

A minimal example looks like this:

v=spf1 include:_spf.google.com include:sendgrid.net -all

That line is not enough by itself. It only works if it matches your actual mail stack.

3. I would inspect Cloudflare coverage and origin exposure

The signal I want is that public traffic hits Cloudflare first, not your raw origin IP. If the origin server is directly reachable from the internet when it should be behind Cloudflare only, you have an avoidable attack path.

I would check:

• DNS records
• Proxy status in Cloudflare
• Origin firewall rules
• SSL mode
• Cache rules
• WAF rules

My fix path is: 1. Proxy all public web traffic through Cloudflare. 2. Lock down the origin so only Cloudflare can reach it. 3. Use Full or Full Strict SSL depending on certificate setup. 4. Turn on basic WAF protections for common bot noise and abusive requests.

4. I would validate form handling like an attacker

The signal here is whether your lead form accepts junk safely. A landing page for B2B services often looks harmless until bots start posting spam payloads or malformed inputs that break downstream automation.

I would test:

• Empty fields
• Very long strings
• HTML tags
• Script payloads
• Unicode edge cases
• Repeated submissions

My fix path is: 1. Validate on the server, not just in the browser. 2. Rate limit submissions by IP and fingerprint where possible. 3. Sanitize before storing or rendering anywhere else. 4. Add honeypot fields or CAPTCHA only if abuse starts showing up.

5. I would check redirects and subdomains for accidental exposure

The signal is whether every redirect goes where you expect and every subdomain has a reason to exist. Open redirects are useful to attackers because they let them make your domain look trustworthy while sending people somewhere else.

I would review:

• `www` to root redirects
• HTTP to HTTPS redirects
• Old campaign URLs
• Staging subdomains
• Mail-related subdomains like `mail`, `smtp`, `autodiscover`

My fix path is: 1. Remove unused subdomains from DNS. 2. Restrict redirect targets to an allowlist. 3. Delete stale staging environments or protect them with auth. 4. Make sure old URLs resolve intentionally instead of failing randomly.

6. I would confirm monitoring catches failures fast enough

The signal is whether you know about downtime before customers do. For first 100 users in B2B services, even one missed inquiry can cost more than the monitoring setup.

I would use:

• UptimeRobot or Better Stack
• Synthetic checks from multiple regions
• Error notifications into email plus Slack

My fix path is: 1. Add HTTP uptime checks for homepage and contact endpoint. 2. Alert on SSL expiry at least 14 days before renewal. 3. Watch for increased response times as well as hard downtime. 4. Keep alert noise low so you do not ignore real incidents.

Red Flags That Need a Senior Engineer

If I see any of these, I would stop DIYing and buy Launch Ready instead of burning time:

1. You have multiple domains pointing at different hosts with no clear owner.

• This creates brand confusion and security gaps.

2. Your form submits directly to third-party tools from client-side code only.

• That makes abuse easier and exposes integration details.

3. You are using copied AI-generated config without understanding it.

• Misconfigured DNS or email records can quietly kill deliverability.

4. Your deployment depends on manual steps nobody has documented.

• One missed step becomes a broken launch day.

5. You cannot say where secrets live right now.

• That usually means they are already too widely shared.

DIY Fixes You Can Do Today

These are practical moves you can make before contacting me:

1. Audit your domain records in one place Check A records, CNAMEs, MX records, TXT records, and any old campaign domains you forgot about.

2. Turn on HTTPS enforcement Make sure every version of the site redirects to one canonical HTTPS URL.

3. Review your environment variables Remove anything sensitive from client-side code immediately.

4. Send test emails from real inboxes Test Gmail and Outlook delivery for contact form confirmations and sales follow-ups.

5. Add one uptime monitor Even a basic free monitor is better than finding out about downtime from a customer lead message.

Where Cyprian Takes Over

Here is how checklist failures map to Launch Ready deliverables:

| Failure found | Deliverable that fixes it | Timeline | |---|---|---| | Broken DNS or wrong domain routing | Domain setup + DNS cleanup + redirects + subdomains review | Hours 1 to 8 | | Missing SSL or mixed content warnings | SSL setup + HTTPS enforcement + canonical redirects | Hours 1 to 8 | | Weak email deliverability | SPF/DKIM/DMARC setup + verification tests + handoff notes | Hours 4 to 16 | | Public origin exposure or no edge protection | Cloudflare setup + DDoS protection + cache rules + WAF basics | Hours 4 to 16 | | Exposed secrets or bad env handling | Secrets audit + environment variable cleanup + rotation guidance | Hours 6 to 20 | | No monitoring or slow incident awareness | Uptime monitoring + alert routing + expiry checks | Hours 12 to 24 | | Unclear handover process | Production deployment notes + ownership checklist + next-step guide | Hours 24 to 48 |

The practical outcome should be this: your founder landing page can handle first traffic without leaking credentials, losing leads to spam folders, confusing visitors with broken redirects, or leaving you blind when something fails.

References

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 SSL/TLS documentation: https://developers.cloudflare.com/ssl/ 5. Google Workspace email authentication guide: https://support.google.com/a/answer/174124?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.*