Launch Ready API security Checklist for founder landing page: Ready for app review in B2B service businesses?.

What "ready" means for a founder landing page in B2B service businesses

For this product, "ready" does not mean "the page loads." It means a buyer can land on the page, trust it, submit a lead form, and your stack can handle that data without leaking secrets, breaking email delivery, or exposing admin routes.

For app review, I would define ready as: no critical auth bypasses, no exposed API keys, no broken forms, SPF/DKIM/DMARC passing, SSL enforced everywhere, redirects correct on all domains and subdomains, uptime monitoring active, and the page meeting a basic performance bar like LCP under 2.5s on mobile. If any of those fail, you are not ready. You are just publicly reachable.

For B2B service businesses, the risk is not only security. A weak landing page burns ad spend, lowers conversion, creates support noise, and makes your business look unstable before the first sales call. If the page is meant to support app review or internal approval, the reviewer will judge reliability fast and harshly.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | SSL everywhere | All domains redirect to HTTPS with no mixed content | Protects trust and prevents browser warnings | Forms scare users and tracking may fail | | DNS setup | Apex, www, and key subdomains resolve correctly | Prevents dead links and bad routing | Lost traffic and broken email links | | Redirects | One canonical URL per page with 301s in place | Avoids duplicate content and SEO confusion | Split authority and inconsistent review results | | Cloudflare protection | WAF/DDoS enabled with sensible rules | Reduces bot abuse and simple attacks | Downtime spikes and noisy logs | | Email auth | SPF, DKIM, DMARC all passing | Keeps lead emails out of spam | Missed leads and failed follow-up | | Secrets handling | No secrets in client code or repo history | Prevents credential theft | API compromise and billing abuse | | Monitoring | Uptime alerts active with owner notified in minutes | Detects outages before customers do | Silent downtime and lost leads | | Form security | Validation server-side plus rate limiting | Stops spam and injection attempts | Inbox flooding and backend abuse | | Deployment safety | Production uses env vars and least privilege access | Limits blast radius if something leaks | Full account compromise risk | | Performance bar | Mobile LCP under 2.5s; no major CLS issues | Improves conversion and review quality | Higher bounce rate and weaker ad ROI |

The Checks I Would Run First

1. Check that every public route is HTTPS only

Signal: Visiting `http://` never serves content directly. All variants redirect to one canonical HTTPS URL with a single 301 hop.

Tool or method: Browser test, `curl -I`, Cloudflare dashboard.

Fix path: Force HTTPS at the edge, remove redirect chains, then test apex domain, `www`, and any campaign subdomains again.

2. Check for exposed secrets in the frontend bundle or repo

Signal: No API keys, private tokens, webhook secrets, or service credentials appear in source maps, built JS files, Git history, or environment screenshots.

Tool or method: Search the repo for patterns like `sk-`, `pk_`, `Bearer`, `.env`, plus secret scanners such as GitHub secret scanning or Gitleaks.

Fix path: Move all sensitive values to server-side env vars immediately. Rotate anything that was already exposed. Do not trust "it is only a test key."

3. Check form submission security end-to-end

Signal: A fake lead submission cannot inject HTML into emails, cannot spam unlimited requests, and cannot bypass validation by calling the endpoint directly.

Tool or method: Submit malformed payloads from browser dev tools or Postman. Test empty fields, long strings, script tags, repeated requests from one IP.

Fix path: Validate on the server first. Add rate limiting per IP and per email. Sanitize output before sending to CRM or email.

4. Check email authentication before launch

Signal: SPF passes for your sending provider; DKIM signs outgoing mail; DMARC is set to at least `quarantine` after testing.

Tool or method: MXToolbox or your email provider's DNS checker.

Fix path: Add the required DNS records in Cloudflare or your registrar. Send test messages to Gmail and Outlook to confirm they do not land in spam.

5. Check Cloudflare edge protections

Signal: WAF is active, bot traffic is filtered where appropriate, DDoS protection is on by default, and only necessary origins are exposed.

Tool or method: Cloudflare dashboard plus an origin scan from outside your network.

Fix path: Lock down origin IP access where possible. Use firewall rules for admin paths. Do not expose staging environments publicly unless required.

6. Check monitoring and alerting before traffic starts

Signal: You get an alert within 1 to 5 minutes if the site goes down or the form endpoint fails.

Tool or method: UptimeRobot, Better Stack, Pingdom, or similar synthetic checks against homepage plus lead form submit flow.

Fix path: Monitor both availability and user journey points. A homepage up check alone is not enough if forms are broken.

SPF: v=spf1 include:_spf.google.com ~all
DMARC: v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com

Red Flags That Need a Senior Engineer

1. You have multiple environments but no clear separation between staging and production. 2. Your contact form talks directly to third-party APIs from the browser. 3. Secrets were pasted into Lovable, Bolt, Cursor outputs, GitHub issues, or chat logs. 4. You cannot explain who owns DNS records, SSL renewal, backups of config files, or monitoring alerts. 5. The landing page is tied to login areas, admin routes, webhooks with side effects, or CRM automations that can trigger revenue loss if they fail.

If I see two or more of those at once, I would not recommend DIY cleanup unless you already have strong engineering support. The cost of one mistake here is usually higher than the cost of fixing it properly once.

DIY Fixes You Can Do Today

1. List every domain and subdomain

Write down apex domain, `www`, staging URLs, email-sending domain namespaced records like SPF/DKIM/DMARC targets ,and any campaign URLs you use in ads.

2. Rotate anything that might be exposed

If a key has ever been visible in frontend code or shared screenshots ,rotate it now . Assume exposure until proven otherwise .

3. Turn on HTTPS redirects

Make sure every public URL goes to one canonical HTTPS version . This removes mixed content issues and stops duplicate indexing .

4. Test your contact form manually

Submit normal leads ,blank fields ,very long inputs ,and obvious junk . Confirm you receive exactly one clean notification per submission .

5. Set up basic uptime monitoring

Add a check for homepage availability plus one check for form submission success . If you do nothing else ,this gives you early warning instead of customer complaints .

Where Cyprian Takes Over

This service exists for founders who need the boring but risky parts handled fast without turning launch into a week-long fire drill.

Here is how checklist failures map to Launch Ready deliverables:

| Checklist failure | What I fix in Launch Ready | |---|---| | Broken HTTP to HTTPS behavior | Domain setup ,redirects ,SSL enforcement | | Confusing apex/www/subdomain routing | DNS cleanup ,canonical redirects ,subdomain mapping | | Spammy bots hitting forms | Cloudflare WAF ,DDoS protection ,rate limiting strategy | | Emails going to spam | SPF ,DKIM ,DMARC configuration | | Secrets exposed in frontend assets | Environment variables ,secret removal ,deployment hardening | | No visibility after launch | Uptime monitoring ,alerting ,handover checklist |

The delivery window is 48 hours because this work should be tight and execution-focused . They need one senior engineer to make the stack production-safe without dragging out scope .

My recommended path is simple: if your landing page touches payments ,lead capture ,email automation ,or any backend API at all ,do not ship without this pass . The cost of fixing a broken launch later is usually lost leads ,support load ,and extra ad spend with nothing to show for it .

Delivery Map

References

• roadmap.sh API Security Best Practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh Cyber Security: https://roadmap.sh/cyber-security
• roadmap.sh Code Review Best Practices: https://roadmap.sh/code-review-best-practices
• OWASP Top 10: https://owasp.org/www-project-top-ten/
• Cloudflare Learning Center: https://www.cloudflare.com/learning/

---

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.*