Launch Ready API security Checklist for founder landing page: Ready for security review in founder-led ecommerce?.

What "ready" means for a founder-led ecommerce landing page

For this product, "ready" does not mean "the page loads on my laptop." It means a security reviewer can check the domain, email, deployment, and API surface without finding exposed secrets, broken auth boundaries, unsafe third-party scripts, or email spoofing gaps.

If I were auditing this for a founder-led ecommerce brand, I would call it ready only when these are true: zero exposed secrets in the repo or frontend bundle, SPF/DKIM/DMARC all passing, Cloudflare is in front of the site, SSL is enforced everywhere, redirects are clean, environment variables are not leaked to the browser, and any API endpoints behind the landing page have no obvious auth bypasses or input validation gaps. If you have forms, waitlists, checkout links, or lead capture APIs, I also want p95 API latency under 500ms and no critical errors in logs during a 24 hour smoke test.

This is exactly why I built Launch Ready.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | HTTPS everywhere | All URLs redirect to HTTPS with one canonical host | Prevents session theft and mixed content issues | Security warnings, trust loss | | Cloudflare in front | DNS proxied through Cloudflare with WAF and DDoS protection on | Reduces attack surface and absorbs abuse | Direct origin exposure | | SSL valid | No cert errors on apex or subdomains | Reviewers will stop at certificate failures | Browser blocks and failed audits | | Secrets hidden | Zero secrets in repo, build output, or client bundle | Prevents credential leakage | Account compromise and data exposure | | SPF/DKIM/DMARC pass | All three authenticate mail successfully | Stops spoofing and improves deliverability | Order emails and receipts land in spam | | Redirects clean | One hop max from old URLs to final URLs | Avoids SEO loss and broken tracking | Lost traffic and broken campaigns | | Env vars server-only | Public frontend contains no private keys or tokens | Keeps API access controlled | Exposed admin access or billing abuse | | Monitoring active | Uptime checks alert within 5 minutes of outage | Lets you catch failures before customers do | Silent downtime and support load | | API auth checked | No unauthenticated access to protected endpoints | Core API security requirement | Data leaks or account takeover paths | | Input validation present | Forms reject bad payloads and oversized inputs | Blocks injection and abuse patterns | Spam floods, log pollution, exploit chains |

The Checks I Would Run First

1. Domain and redirect chain

• Signal: The apex domain resolves correctly, www redirects once to the canonical host, and there are no loops.
• Tool or method: `curl -I`, browser dev tools, Cloudflare DNS dashboard.
• Fix path: Set one canonical domain rule at the edge. Remove duplicate redirects from app code so you do not stack Cloudflare plus framework redirects.

2. TLS and SSL posture

• Signal: No certificate warnings on root domain or subdomains used by the brand.
• Tool or method: Browser check plus SSL Labs test.
• Fix path: Issue valid certs through Cloudflare or your host. Force HTTPS at the edge and disable any mixed-content assets still loading over HTTP.

3. Email authentication

• Signal: SPF passes, DKIM signs outbound mail, DMARC is set to at least `p=quarantine` after testing.
• Tool or method: MXToolbox or Google Postmaster Tools.
• Fix path: Publish correct DNS records for your email provider. If you skip this step, order confirmations and abandoned cart emails get flagged as suspicious.

4. Secrets exposure review

• Signal: No API keys in Git history, frontend bundles, `.env` files committed to the repo, or public source maps.
• Tool or method: Secret scanning in GitHub plus manual search for `sk_`, `pk_`, `AIza`, `Bearer`, webhook URLs.
• Fix path: Rotate anything exposed immediately. Move sensitive values to server-side environment variables only.

5. API endpoint authorization

• Signal: Protected endpoints reject requests without a valid session token or signed request.
• Tool or method: Postman or curl against each endpoint with no auth header.
• Fix path: Add middleware checks before business logic runs. Do not rely on obscurity like hidden URLs.

6. Form validation and abuse resistance

• Signal: Form fields reject oversized payloads, invalid emails, script tags inside text inputs, and repeated submissions.
• Tool or method: Manual tests plus rate limit checks from browser dev tools.
• Fix path: Validate on server first. Add rate limiting and CAPTCHA only where needed so you do not hurt conversion.

SPF: v=spf1 include:_spf.yourprovider.com ~all
DKIM: published by provider
DMARC: v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com

Red Flags That Need a Senior Engineer

1. You have checkout flow code but no clear boundary between public pages and protected APIs. That usually means someone can hit endpoints directly even if the UI hides them.

2. Your landing page pulls keys into client-side code to talk to Stripe-like services or internal APIs. Once a key ships to the browser it is effectively public.

3. You changed DNS more than once last week and now some visitors see the old site while others see the new one. This creates support confusion and makes security review look sloppy.

4. You have forms sending data into multiple tools with no logging trail. If something breaks later you will not know whether it was DNS, email auth, a webhook failure, or an API timeout.

5. You cannot answer who owns secrets rotation after launch. If nobody owns that process now then leaked credentials become a business risk instead of an engineering task.

DIY Fixes You Can Do Today

1. Turn on Cloudflare proxy for your main domain. This gives you basic DDoS protection and hides your origin IP from casual scanning.

2. Check every public page for mixed content. Replace any `http://` assets with HTTPS versions before reviewers spot browser warnings.

3. Audit your repository for secrets. Search for private keys, webhook URLs, database strings, analytics tokens, and map them against what is actually needed in production.

4. Verify SPF/DKIM/DMARC with your email provider dashboard. If those records are missing today then fix them before launch emails start landing in spam.

5. Test your form submissions end to end. Submit normal data plus empty values,, very long text,, quotes,, angle brackets,, and repeated clicks so you see where validation fails before customers do.

Where Cyprian Takes Over

Here is how I map failures to deliverables:

• Domain mismatch,, redirect loops,, subdomain chaos -> DNS cleanup,, redirect rules,, canonical host setup
• Certificate errors,, mixed content,, insecure asset loading -> SSL enforcement,, HTTPS-only configuration
• Spoofed emails,, spam folder delivery,, failed receipts -> SPF/DKIM/DMARC setup
• Public secrets,, leaked env vars,, unsafe build artifacts -> secret cleanup,, environment variable hardening
• Direct origin exposure,, weak edge protection -> Cloudflare setup with caching and DDoS protection
• No visibility into outages -> uptime monitoring plus handover checklist
• Unclear production process -> deployment review and release handoff

My rule is simple: if a founder can fix it safely in under 30 minutes without touching production risk areas., they should do it themselves., If it touches auth., secrets., DNS., email delivery., or customer-facing uptime., I take over so they do not create a bigger incident while trying to save time.

A simple audit flow

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 roadmap: https://roadmap.sh/cyber-security
• Cloudflare SSL/TLS documentation: https://developers.cloudflare.com/ssl/
• OWASP ASVS overview: https://owasp.org/www-project-application-security-verification-standard/

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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.*