Launch Ready cyber security Checklist for mobile app: Ready for launch in marketplace products?.

Launch Ready cyber security Checklist for mobile app: Ready for launch in marketplace products?

For a marketplace mobile app, "ready" does not mean "the app opens on my phone." It means a stranger can install it, sign up, browse, buy, message, pay, and log out without exposing customer data, breaking auth, or sending traffic to a half-configured backend.

If I were auditing this for launch, I would define ready as: no exposed secrets, no critical auth bypasses, production DNS and SSL working everywhere, email deliverability passing SPF/DKIM/DMARC, Cloudflare protecting the edge, monitoring alerting on failures, and the app store release path not blocked by broken domains or insecure endpoints. For a marketplace product, I would also want p95 API latency under 500ms for core flows, zero critical security findings, and a rollback path that works in under 15 minutes.

If any of these are missing, you do not have a launch-ready product. You have a prototype with risk attached.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | DNS | Domain resolves correctly for app, API, and email | Users and app stores need stable endpoints | Signup fails, links break, support load rises | | SSL | All public endpoints use valid HTTPS | Prevents interception and trust issues | App warnings, login failures, blocked webviews | | Secrets | Zero secrets in repo or client bundle | Stops account takeover and data exposure | Breach risk, leaked API keys, cloud abuse | | Auth | No auth bypass on buyer/seller/admin flows | Marketplace roles must stay isolated | Fraud, unauthorized access, refunds | | CORS | Only approved origins allowed | Protects browser-based API access | Data exfiltration from malicious sites | | Email auth | SPF/DKIM/DMARC all pass | Transactional email must land in inboxes | OTPs fail, receipts vanish into spam | | Cloudflare | WAF, caching, DDoS protection enabled where needed | Reduces attack surface and downtime risk | Outages during traffic spikes or attacks | | Monitoring | Uptime checks and error alerts active | You need to know before customers do | Silent downtime and lost sales | | Redirects/subdomains | www/non-www/app/api routes are consistent | Avoids broken links and mixed content | SEO loss, login loops, failed deep links | | Handover docs | Deployment steps and recovery steps documented | Lets you recover fast under pressure | Slow incident response and dependency on one person |

The Checks I Would Run First

1) Public endpoint inventory

Signal: I want to know every internet-facing surface: web domain, API domain(s), auth callback URLs, image/CDN paths, email sending domain(s), admin panels, and any staging URL that should not be public.

Tool or method: I would map DNS records with `dig`, inspect the mobile app config for hardcoded endpoints, then crawl the app's network calls from a test build. I also check whether staging is indexed or accessible without protection.

Fix path: Remove anything public that should not be public. Put staging behind basic auth or IP allowlisting. Make sure production points only to production services.

2) Secrets exposure check

Signal: Zero exposed secrets in Git history, environment files shipped to the client app bundle, logs, screenshots, or CI output. One leaked key is enough to create real damage.

Tool or method: I would run secret scanning across the repo history and current branch. I would also inspect the built mobile bundle for API keys that should never be there.

Fix path: Rotate every exposed key immediately. Move sensitive values into server-side environment variables. If a mobile client must hold a key at all, assume it is public and scope it accordingly.

3) Auth flow integrity

Signal: Buyer cannot access seller data. Seller cannot access admin actions. Unauthenticated users cannot hit protected APIs directly. Session expiry behaves correctly.

Tool or method: I would test login/logout/recovery flows manually and with request replay tools. Then I would try role swapping by changing IDs in requests and checking whether the backend blocks it.

Fix path: Enforce authorization on the server for every sensitive action. Do not trust client-side role checks. Add tests for IDOR cases on orders, listings, payouts, messages, and profile edits.

4) Email deliverability setup

Signal: SPF passes. DKIM passes. DMARC is present and aligned. Transactional emails arrive reliably for signup OTPs, order updates, password resets, and dispute notices.

Tool or method: I would inspect DNS records and send test mail to multiple providers. Then I would verify headers using an inbox tool or raw message inspection.

Fix path: Publish correct SPF/DKIM/DMARC records before launch. Use one sender domain for transactional mail. Do not mix marketing blasts with critical product mail unless you know exactly how reputation is handled.

5) Cloudflare edge protection

Signal: Cloudflare is actually protecting your origin rather than just sitting in front of it with default settings.

Tool or method: I would verify proxy status on DNS records with orange-cloud enabled where appropriate. Then I would check WAF rules, rate limits if needed, TLS mode selection, caching rules for static assets only, and bot/DDOS protections.

Fix path: Lock down origin access so only Cloudflare can reach it where possible. Turn on HTTPS redirects at the edge. Cache static assets aggressively but never cache private API responses by accident.

6) Production deployment safety

Signal: Production deploys are repeatable from source control with known environment variables and no manual mystery steps on someone's laptop.

Tool or method: I would review CI/CD logs plus deployment commands end-to-end. Then I would do a dry run restore of the environment variables list against a fresh environment checklist.

Fix path: Document exact deploy steps. Separate staging from production credentials. Add rollback instructions that do not depend on tribal knowledge.

## Example production env pattern
API_URL=https://api.example.com
APP_ENV=production
NEXT_PUBLIC_SITE_URL=https://example.com

Red Flags That Need a Senior Engineer

1. You have keys in the mobile app bundle that can call paid third-party APIs. That usually means someone treated client code like a secure vault when it is not one.

2. Your marketplace has buyer-seller messaging but no authorization tests. This is where IDOR bugs hide and where private conversations get exposed.

3. Staging shares credentials with production. One accidental click can become a real outage or data leak.

4. Your transactional emails sometimes go to spam. That breaks password resets and order notifications right when users need them most.

5. Nobody knows how to roll back a bad deploy. If launch day goes wrong and recovery takes hours instead of minutes, you burn trust fast.

DIY Fixes You Can Do Today

1. Audit your domain setup. Make sure `www`, root domain, `api`, `app`, and any custom auth callback URLs all point where they should. Remove stale records that no longer serve a purpose.

2. Turn on HTTPS everywhere. Force redirects from HTTP to HTTPS. Check that your SSL certificate is valid on every public endpoint, including subdomains used by the mobile app backend.

3. Review your environment variables. Delete anything unused. Move secrets out of code. If something appears in the frontend build that should be private, treat it as exposed already.

4. Test your email headers. Send one signup email, one reset-password email, and one order notification. Confirm SPF/DKIM/DMARC pass before launch, not after users complain about missing mail.

5. Install basic uptime monitoring. Set alerts for homepage, API health endpoint, login endpoint, and checkout flow if you have one. A 5-minute alert delay is better than discovering downtime from Twitter complaints.

Where Cyprian Takes Over

This is where my Launch Ready sprint makes sense instead of another week of DIY guessing.

I use this service when the product exists but launch risk is still too high: domain setup is messy, email deliverability is uncertain, Cloudflare is half-configured, secrets are leaking somewhere, or nobody has validated production deployment end to end.

Here is how failures map to delivery:

| Failure found | Deliverable in Launch Ready | |---|---| | Broken DNS or subdomains | Domain setup for root/app/api/email paths | | Mixed HTTP/HTTPS issues | SSL configuration plus forced redirects | | Weak edge protection | Cloudflare setup with caching and DDoS protection | | Missing transactional email trust signals | SPF/DKIM/DMARC configuration | | Secret leakage risk | Environment variable cleanup and secret handling review | | Unclear deployment process | Production deployment plus handover checklist | | No visibility into outages | Uptime monitoring setup |

Timeline wise:

• Hour 0-8: audit DNS,

SSL, environment variables, deployment path, email records, public endpoints.

• Hour 8-24: fix domain routing,

redirects, Cloudflare settings, secrets handling, origin access controls.

• Hour 24-36: deploy production build safely,

validate auth flows, test marketplace-critical endpoints.

• Hour 36-48: monitoring setup,

handover checklist, rollback notes, final verification pass.

I am not just "making it work." I am reducing the chance that launch day becomes an incident report with lost signups, failed payments, or exposed user data.

Delivery Map

References

• https://roadmap.sh/cyber-security
• https://roadmap.sh/api-security-best-practices
• https://roadmap.sh/code-review-best-practices
• https://roadmap.sh/qa
• https://developers.cloudflare.com/
• https://developer.mozilla.org/en-US/docs/Web/Security/Transport_Layer_Security
• https://www.rfc-editor.org/rfc/rfc7208
• https://www.rfc-editor.org/rfc/rfc6376

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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.*