Launch Ready cyber security Checklist for paid acquisition funnel: Ready for launch in mobile-first apps?.

Launch Ready cyber security Checklist for paid acquisition funnel: Ready for launch in mobile-first apps?

"Ready" for a paid acquisition funnel is not "the app works on my phone". Ready means a stranger can click an ad, land on the app or landing page, sign up, pay, and complete the core flow without exposing secrets, breaking redirects, leaking data, or getting blocked by email or browser security.

For a mobile-first app, I want to see four things before launch: the funnel loads fast on 4G, identity and payment paths are protected, domain and email are configured correctly, and monitoring will tell you within minutes if something breaks. If any of those are missing, you are not ready to spend on ads.

A practical launch bar I use:

• LCP under 2.5s on mobile.
• No exposed secrets in repo, build logs, or client-side code.
• SPF, DKIM, and DMARC all passing.
• p95 API latency under 500ms for signup and checkout routes.
• Zero critical auth bypasses or open redirect issues.

If you cannot confirm those with evidence, you do not have a launch-ready funnel. You have a demo that can waste ad spend and create support load.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain setup | Primary domain resolves correctly with www/non-www policy defined | Ads need one canonical destination | Duplicate content, broken links, tracking loss | | SSL/TLS | HTTPS valid on all public routes and subdomains | Protects login and payment traffic | Browser warnings, trust loss, blocked forms | | Redirects | 301 redirects are intentional and tested | Preserves SEO and ad attribution | Broken funnels, looped redirects, lost conversions | | Email auth | SPF, DKIM, DMARC all pass | Ensures transactional emails land in inboxes | OTP failures, password reset failures | | Secrets handling | Zero secrets in client bundle or public repo | Prevents account takeover and abuse | Credential leaks, API abuse, billing fraud | | Cloudflare/WAF | DDoS protection and basic WAF rules enabled | Paid traffic can trigger abuse spikes | Outages, bot signups, server overload | | Deployment safety | Production deploy is repeatable with rollback path | Reduces launch risk at go-live | Broken release with no fast recovery | | Monitoring | Uptime checks plus error alerts active | You need early warning after ad spend starts | Silent downtime, delayed incident response | | Mobile performance | LCP under 2.5s on 4G-ish conditions | Mobile users bounce fast | Lower conversion rate and higher CAC | | Auth flow security | No auth bypasses; rate limits on login/reset/signup | Funnel endpoints get attacked first | Account stuffing, spam accounts, lockouts |

The Checks I Would Run First

1. Domain and redirect map

Signal:

• One canonical domain is chosen.
• www to non-www or non-www to www redirects are consistent.
• Old campaign URLs still resolve with correct 301s.

Tool or method:

• `curl -I` against every known entry point.
• Check DNS records in Cloudflare or registrar.
• Test from mobile browser and ad preview links.

Fix path:

• Set one canonical host.
• Remove redirect chains longer than one hop.
• Update ad URLs to the final destination only.

2. SSL coverage across all public surfaces

Signal:

• No mixed content warnings.
• Every public route uses valid HTTPS.
• Subdomains like `app`, `api`, `auth`, and `www` are covered.

Tool or method:

• Browser devtools console.
• SSL Labs test.
• Cloudflare certificate status.

Fix path:

• Force HTTPS at edge.
• Replace hardcoded `http://` assets.
• Issue wildcard or SAN certs where needed.

3. Secrets exposure audit

Signal:

• No API keys in frontend bundles.
• No `.env` values committed to git history.
• Build logs do not print tokens.

Tool or method:

• Search repo for common secret patterns.
• Inspect built JS bundle for public env vars.
• Review CI logs and deployment history.

Fix path:

• Move secrets server-side only.
• Rotate any key that was ever exposed.
• Use environment variables with least privilege scopes.

Short snippet if you need a quick env hygiene check:

grep -R "sk_live\|api_key\|secret\|token" . --exclude-dir=node_modules --exclude-dir=.git

4. Email authentication for transactional flows

Signal:

• SPF passes for your sender.
• DKIM signs outbound mail.
• DMARC policy exists and aligns with your domain.

Tool or method:

• MXToolbox checks.
• Google Postmaster Tools if you send volume.
• Send test password reset and verification emails.

Fix path:

• Add correct DNS records in Cloudflare or registrar.
• Use one sending provider per domain where possible.
• Do not launch paid traffic until OTP and reset emails arrive reliably.

5. Authentication and rate limiting

Signal:

• Signup, login, reset password, OTP verify, and checkout endpoints reject abuse cleanly.
• Repeated requests get throttled without breaking real users.

Tool or method:

• Manual attempts from multiple devices/IPs.
• Basic scripted request bursts against auth endpoints.
• Review server logs for repeated failures.

Fix path:

• Add rate limits per IP plus per account identifier.
• Add CAPTCHA only where abuse is obvious; do not block real mobile users too early.
• Lock down admin routes behind stronger auth than customer routes.

6. Monitoring before spend starts

Signal:

• Uptime monitor checks the homepage plus core funnel endpoints every 1 to 5 minutes.
• Error alerts go to email/Slack/SMS with clear ownership.

Tool or method:

• UptimeRobot, Better Stack, Datadog synthetics, or similar.
• Test alert delivery by forcing a failure window.

Fix path:

• Monitor homepage, signup page, API health route, and checkout callback route separately.
• Add log-based alerts for 5xx spikes and auth anomalies.

Red Flags That Need a Senior Engineer

1. You have direct-to-client API calls using live keys in the browser. That is a billing leak waiting to happen.

2. Your funnel depends on fragile third-party scripts for analytics or chat widgets. One bad script can hurt LCP and break checkout on mobile.

3. You cannot explain which domain sends email versus which domain hosts the app. That usually means deliverability problems are already happening.

4. There is no rollback plan for production deployment. If launch fails during an ad push, every minute costs money.

5. You see weird login attempts, fake signups, or bot traffic before launch. That is an early signal of automation abuse that will get worse once ads start running.

DIY Fixes You Can Do Today

1. Verify your canonical domain

• Pick one primary URL for ads and internal links.
• Make sure every other variant redirects once to it.

2. Remove obvious secret exposure

• Search your repo for private keys and tokens.
• Rotate anything that may have been committed before cleanup.

3. Check email DNS records

• Confirm SPF includes only approved senders.
• Confirm DKIM signing is enabled by your provider.
• Set DMARC to at least `p=none` while testing so you can see reports without blocking mail immediately.

4. Test the mobile funnel end to end

• Use a real phone over cellular data if possible.
• Complete signup, verification email receipt, login, payment intent creation if relevant, and success screen capture.

5. Turn on basic monitoring now

• Add uptime checks for homepage plus the main conversion route.
• Add alerts for downtime and repeated 401/403/500 responses.

Where Cyprian Takes Over

When these checks fail together before paid acquisition starts, I would not recommend piecemeal fixes from random contractors.

Here is how the failures map to the service:

| Failure area | Launch Ready deliverable | Timeline | |---|---|---| | DNS confusion or broken subdomains | DNS cleanup, subdomain setup, redirects map | Hours 1 to 8 | | SSL issues or mixed content warnings | Cloudflare config + SSL enforcement + caching rules | Hours 1 to 12 | | Email deliverability problems | SPF/DKIM/DMARC setup and validation | Hours 4 to 16 | | Secret leakage risk | Environment variable audit + secret handling cleanup + rotation plan | Hours 4 to 20 | | Weak production deployment process | Production deployment + safe rollout checklist + rollback notes | Hours 8 to 24 | | Missing uptime visibility | Monitoring setup + alert routing + health checks | Hours 16 to 32 | | Handoff gaps after launch prep | Final handover checklist with ownership notes | Hours 32 to 48 |

My recommendation is simple: if you are about to spend money on ads and cannot prove the scorecard above passes today at least 8 out of 10 times under real mobile conditions,, buy the sprint instead of improvising.

Launch Ready includes exactly what this kind of funnel needs: domain work,, email authentication,, Cloudflare,, SSL,, caching,, DDoS protection,, production deployment,, environment variables,, secrets review,, uptime monitoring,, redirects,, subdomains,, SPF/DKIM/DMARC,, plus a clean handover checklist delivered in 48 hours. That is enough time to turn a fragile pre-launch stack into something I would actually let run paid traffic against.

Delivery Map

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.*