Launch Ready cyber security Checklist for paid acquisition funnel: Ready for first 100 users in marketplace products?.

Launch Ready cyber security Checklist for paid acquisition funnel: Ready for first 100 users in marketplace products?

"Ready" for this kind of product does not mean "the site loads on my laptop." It means a paid user can land, trust the brand, sign up, pay, and reach the core marketplace action without exposing customer data, breaking email deliverability, or creating a support fire.

For a marketplace product targeting the first 100 users, I would call it ready only if all of this is true:

• The domain resolves correctly with HTTPS everywhere.
• Signup, login, checkout, and onboarding work on mobile and desktop.
• No critical auth bypasses exist.
• No secrets are exposed in code, logs, or frontend bundles.
• Email authentication passes SPF, DKIM, and DMARC.
• Cloudflare or equivalent protection is active.
• Uptime monitoring is live.
• Redirects, subdomains, and canonical URLs are clean.
• The funnel can handle ad traffic without breaking under basic load.
• You have a handover checklist so the next bug does not become a launch stop.

If any one of those fails, you are not "launch ready." You are buying traffic into risk. That means wasted ad spend, broken conversion tracking, support load, and in the worst case exposed customer data or account takeover.

This is exactly why I built Launch Ready.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | HTTPS everywhere | All pages redirect to HTTPS with no mixed content | Protects logins and checkout trust | Browser warnings, lower conversion | | DNS correctness | Root domain and key subdomains resolve properly | Prevents broken landing pages and app access | Lost traffic from ads and emails | | SPF/DKIM/DMARC | All three pass on sending domain | Keeps emails out of spam and spoofing risk down | Verification emails fail, inbox placement drops | | Secrets handling | Zero exposed API keys or private tokens | Stops unauthorized access to third-party services | Data leaks, billing abuse | | Auth checks | No critical auth bypasses or IDOR on core flows | Protects user accounts and marketplace data | Account takeover, data exposure | | Cloudflare protection | DDoS protection and WAF basics enabled | Reduces bot abuse and noisy attacks | Funnel downtime during traffic spikes | | Redirect map | HTTP to HTTPS and non-canonical URLs redirect once only | Preserves SEO and ad quality score signals | Broken attribution, duplicate pages | | Monitoring live | Uptime alerts trigger within 5 minutes | Lets you catch outages before users do | Silent downtime during campaign spend | | Performance baseline | LCP under 2.5s on key landing page mobile view | Paid traffic converts worse when slow | Higher bounce rate, lower ROAS | | Production deploy safe | Environment variables set per environment; no dev config in prod | Avoids accidental test mode or debug exposure | Failed payments, leaked logs |

The Checks I Would Run First

1. Domain and redirect chain check

Signal: the root domain should resolve to one canonical URL path with one redirect at most. If I see multiple hops like `http -> www -> https -> app`, that is a problem for both speed and reliability.

Tool or method: I use `curl -I`, browser dev tools network tab, and a DNS lookup tool. I also test the exact URLs used in ads because paid acquisition often sends people to messy variants.

Fix path: collapse redirects so each entry point goes directly to the final page. Set one canonical domain strategy early: either apex to www or www to apex. Do not leave this as "we'll fix it later" because every extra hop costs attention and can hurt conversion.

2. Secret exposure scan

Signal: no API keys, private tokens, service account JSON files, webhook secrets, or database URLs should be visible in frontend bundles or public repos. One exposed secret is enough to create real damage.

Tool or method: I scan the repo history, deployed JS bundle output, environment files in build artifacts, CI logs, and browser source maps. I also check whether secrets are hardcoded into client-side code.

Fix path: move all sensitive values into server-side environment variables immediately. Rotate anything that may have been exposed. If a key touched production systems already, assume it is compromised until proven otherwise.

Short config example:

## good
NEXT_PUBLIC_API_URL=https://api.example.com
STRIPE_SECRET_KEY=stored-in-hosting-env
DATABASE_URL=stored-in-hosting-env

3. Authentication and authorization test

Signal: users should only see their own marketplace data. If I can change an ID in the URL or request body and access another user's listing or order details, that is an authorization failure.

Tool or method: I test login/logout flows manually plus basic API requests with two separate accounts. I look for IDOR issues by changing object IDs in requests and checking whether access control still holds.

Fix path: enforce authorization on every sensitive read and write at the server layer. Do not trust frontend role checks alone. Add tests for ownership checks on listings, orders, messages, payouts if applicable.

4. Email deliverability check

Signal: SPF passes for your sending domain; DKIM signs mail correctly; DMARC is present with at least `p=none` at launch if you are still observing before tightening policy. Verification emails should land in inboxes instead of spam.

Tool or method: I use MXToolbox-style checks plus actual test sends to Gmail and Outlook accounts. I verify headers after delivery because DNS alone does not prove inbox placement.

Fix path: configure SPF to include only approved senders. Enable DKIM signing in your email provider. Publish DMARC with reporting so you can see spoofing attempts before they become reputation damage.

5. Cloudflare edge protection check

Signal: Cloudflare proxy is active on public web properties where appropriate; basic DDoS protection is on; security headers are not fighting your app; caching rules do not cache authenticated pages by mistake.

Tool or method: I inspect response headers like `cf-cache-status`, review page rules or transforms, test rate-limited behavior where relevant, and confirm origin IP is not casually exposed through old DNS records or misconfigured subdomains.

Fix path: keep static assets cached but never cache personal dashboards or authenticated HTML unless you have explicitly designed for it. Lock down origin access where possible so attackers cannot bypass Cloudflare by hitting the server directly.

6. Monitoring and incident visibility check

Signal: uptime monitoring exists for homepage signup flow plus at least one authenticated route if applicable. Alerts should fire within 5 minutes to email or Slack when status changes.

Tool or method: I set synthetic checks against landing page load time plus health endpoints. Then I verify that alerts actually arrive by simulating a failure window.

Fix path: add one simple uptime monitor first rather than waiting for a full observability stack. For early-stage launches I prefer signal over complexity. If you cannot tell me when signup breaks at 2 am UTC/EST/PST overlap windows depending on your market mix anyway they matter because ad spend keeps running while revenue stops.

Red Flags That Need a Senior Engineer

If you see any of these five signs after launch prep starts looking "simple," stop DIY-ing it:

1. You have production secrets in Git history or shared screenshots. 2. Your app uses multiple auth systems across webflow pages plus custom app pages plus third-party tools. 3. Payment success depends on fragile redirects between marketing site and app subdomain. 4. You cannot explain who owns user data at each step of signup through messaging through checkout through onboarding. 5. You have already spent money on ads but cannot measure whether users reached activation without manual checking.

These are not cosmetic issues. They create launch delay risk fast because every fix touches trust-sensitive parts of the funnel.

DIY Fixes You Can Do Today

Before contacting me, do these five things yourself if you can safely access your hosting and DNS:

1. Change all passwords for domain registrar, hosting provider, email provider, analytics tools next if needed but start there first. 2. Turn on MFA everywhere that supports it. 3. Review `.env` files locally and delete any secret from frontend code paths. 4. Confirm your primary domain uses HTTPS with one clean redirect chain. 5. Send test emails from your platform to Gmail and Outlook accounts to check SPF/DKIM/DMARC behavior before spending more on ads.

If you want a simple threshold to self-check against:

• Zero exposed secrets
• No critical auth bypasses
• LCP under 2.5s on mobile landing page
• p95 API response under 500ms for core signup endpoints
• SPF/DKIM/DMARC passing
• Uptime alerting working within 5 minutes

If those numbers are not close yet then do not scale traffic yet because you will mostly scale problems.

Where Cyprian Takes Over

Here is how checklist failures map to Launch Ready deliverables:

| Failure area | What I fix in Launch Ready | Timeline | |---|---|---| | Broken DNS / redirects / subdomains | DNS setup review plus redirect cleanup plus canonical routing | First 6 hours | | Missing SSL / mixed content / insecure edge setup | Cloudflare configuration plus SSL enforcement plus cache rules review plus DDoS protection basics | First 12 hours | | Email failing spam checks | SPF/DKIM/DMARC setup validation plus sender alignment review | First 12 hours | | Secrets exposure risk | Environment variable cleanup plus secret handling audit plus rotation guidance if needed | First 24 hours | | Weak deployment safety | Production deployment review plus config separation between dev/staging/prod | First 24 hours | | No visibility into outages | Uptime monitoring setup plus handover checklist with alert contacts + recovery steps | By hour 48 |

My recommendation is simple: if your paid funnel depends on trust-sensitive steps like signup verification payment confirmation messaging notifications or marketplace access then buy the sprint instead of improvising under ad spend pressure.

References

• roadmap.sh cyber security best practices: https://roadmap.sh/cyber-security
• roadmap.sh API security best practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh QA roadmap: https://roadmap.sh/qa
• OWASP Top Ten: https://owasp.org/www-project-top-ten/
• Cloudflare SSL/TLS documentation: https://developers.cloudflare.com/ssl/

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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.*