Launch Ready cyber security Checklist for mobile app: Ready for app review in B2B service businesses?.

Launch Ready cyber security Checklist for mobile app: Ready for app review in B2B service businesses?

"Ready" for app review does not mean "the app runs on my phone." It means Apple or Google can inspect the build without hitting obvious security, privacy, or infrastructure problems that create rejection risk, support load, or data exposure.

For a B2B service business, I would call a mobile app ready when it has:

• No exposed secrets in the client app or repo.
• Real authentication and authorization checks on every sensitive action.
• Production domains, SSL, redirects, and email authentication working.
• Basic monitoring so you know when login, checkout, lead capture, or sync breaks.
• A deployment process that is repeatable and safe enough to ship a fix without panic.

If any of these are missing, you are not just "a bit early." You are risking app review delays, broken onboarding, failed sign-in, customer data exposure, and support tickets the day after launch.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | | --- | --- | --- | --- | | 1. Secrets removed from app | No API keys, private tokens, or service credentials in code or bundles | Prevents account takeover and data theft | Attackers can abuse third-party APIs and backend services | | 2. Auth enforced server-side | Every protected endpoint checks user identity and role on the backend | Stops unauthorized access even if the client is modified | Users can view or edit other accounts' data | | 3. HTTPS everywhere | App and APIs use valid SSL with no mixed content | Protects logins and session tokens in transit | App review issues, MITM risk, login failures | | 4. Cloudflare and DDoS protection enabled | DNS proxied where needed, rate limits and WAF rules active | Reduces downtime from bots and traffic spikes | Outages, slow sign-in, wasted ad spend | | 5. SPF/DKIM/DMARC passing | All three authenticate domain email correctly | Improves deliverability for magic links and alerts | Password resets and onboarding emails land in spam | | 6. Redirects and subdomains correct | www/non-www and app/api subdomains resolve as intended | Avoids broken links and inconsistent origin behavior | Login loops, CORS errors, SEO confusion | | 7. Environment variables handled safely | Production secrets live only in deployment environment settings | Keeps source control clean and reduces leak risk | Public secret exposure and emergency rotation work | | 8. Monitoring installed | Uptime checks and error alerts are active before launch | Lets you catch failures before customers do | Silent downtime and delayed incident response | | 9. Caching configured carefully | Static assets cached; auth-sensitive pages not cached publicly | Improves speed without leaking private content | Stale dashboards or cached user data exposure | | 10. Handover checklist complete | Owner knows domains, DNS records, secrets policy, rollback steps | Makes the system maintainable after launch | No one can safely fix production issues |

A simple target I use: zero exposed secrets, SPF/DKIM/DMARC all passing, p95 API latency under 500ms for core endpoints, and no critical auth bypasses.

The Checks I Would Run First

1. Secret exposure check

Signal:

• I look for API keys in the mobile bundle, `.env` files committed to git, config files in screenshots, or hardcoded backend URLs with privileged tokens.
• If I can find one secret quickly with search tools or a bundle scan, I assume there may be more.

Tool or method:

• `git grep`, repository secret scanning, bundle inspection, dependency review.
• Manual search for `sk_`, `pk_`, `Bearer`, `x-api-key`, Firebase admin keys, Stripe secret keys.

Fix path:

• Move all privileged credentials to server-side environment variables.
• Rotate anything already exposed.
• Replace direct client access with signed backend requests.

2. Authentication boundary check

Signal:

• I try to access another user's record by changing an ID in a request.
• I test whether role-based actions are enforced by the API instead of hidden in the UI.

Tool or method:

• Browser dev tools or a proxy like Burp Suite / Charles Proxy.
• Manual API calls against protected endpoints.

Fix path:

• Enforce auth on every route at the backend.
• Add object-level authorization checks.
• Return `401` for unauthenticated access and `403` for forbidden actions.

3. Email domain authentication check

Signal:

• Password reset emails land in spam.
• Magic links are delayed or rejected by mailbox providers.
• Your domain shows failing SPF/DKIM/DMARC results.

Tool or method:

• MXToolbox or similar DNS validation tools.
• Test sends to Gmail and Outlook accounts.

Fix path: Set up SPF/DKIM/DMARC correctly before launch. A minimal DMARC policy can start with monitoring:

v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com; adkim=s; aspf=s

Then move toward enforcement after you confirm legitimate mail is passing.

4. SSL and redirect integrity check

Signal:

• One version of the domain loads over HTTP first.
• Subdomains point inconsistently to old hosts.
• Mixed content warnings appear because images or scripts still load over HTTP.

Tool or method:

• Browser inspection plus SSL test tools.
• DNS lookup of apex domain, `www`, `api`, and any auth subdomain.

Fix path:

• Force HTTPS at the edge.
• Set canonical redirects once only.
• Remove mixed content from assets and webhook callbacks.

5. Cloudflare edge protection check

Signal:

• Bot traffic can hammer your login page or API without rate limits.
• You have no DDoS protection on public endpoints.
• Caching rules accidentally store private pages.

Tool or method:

• Cloudflare dashboard review.
• Load test public endpoints at low volume first to see how rate limiting behaves.

Fix path:

• Put public marketing assets behind caching rules.
• Keep authenticated routes private/no-store.
• Add WAF rules for obvious abuse patterns like repeated login attempts.

6. Monitoring and rollback check

Signal:

• Nobody gets alerted when signup fails at midnight.
• You cannot tell if an outage is frontend-only or backend-wide.
• There is no known rollback path if deploy #14 breaks production.

Tool or method:

• Uptime monitoring tool plus error tracking plus deployment logs.
• One dry-run rollback test before release day.

Fix path:

• Add uptime monitors for homepage, login, API health endpoint, and critical webhooks.
• Send alerts to Slack/email/SMS depending on severity.
• Document rollback steps in plain language.

Red Flags That Need a Senior Engineer

1. You have direct client-side calls to sensitive APIs with shared credentials. That is not a cosmetic issue. It is a data breach waiting to happen.

2. Your app uses custom auth logic across multiple services with no central policy. This creates inconsistent permissions that will fail under real user behavior.

3. Email delivery depends on a domain that has never been authenticated with SPF/DKIM/DMARC. That will hurt onboarding conversion because users never receive reset links or verification emails.

4. The build works locally but fails only after deployment behind Cloudflare or a CDN. That usually means bad environment config, bad redirects, caching mistakes, or origin trust issues.

5. You cannot explain where secrets live today. If you do not know whether keys are in code, CI logs, device storage, or hosting env vars, you should stop shipping until someone senior audits it.

DIY Fixes You Can Do Today

1. Search your repo for secrets now Look for private keys, service account files, `.env` commits, and anything that looks like an admin credential. Delete what should not be public, then rotate exposed values immediately.

2. Confirm every production URL uses HTTPS Check your main domain, API subdomain, and any auth callback URLs. If one endpoint still resolves over HTTP, fix that before release because it weakens trust and causes browser warnings.

3. Test your email authentication records Use an online DNS checker to verify SPF, DKIM, and DMARC exist for your sending domain. If they fail, your onboarding emails may never reach users' inboxes reliably enough for launch.

4. Review your mobile app permissions Only request permissions you truly need right now. A B2B service app should not ask for camera, contacts, location, or microphone unless there is a clear product reason tied to user value.

5. Add basic uptime checks today Monitor homepage, login, API health, and any webhook endpoint that drives billing or onboarding. Even a simple alert beats finding out from angry customers first.

Where Cyprian Takes Over

I map each failure directly to a production-safe fix plan:

| Failure found during audit | What I deliver | | --- | --- | | Exposed secrets | Secret cleanup plan, rotation guidance, env var migration | | Broken auth boundaries | Backend auth review plus safe fixes for authorization gaps | | Domain/email setup issues | DNS cleanup, redirects, subdomains, SPF/DKIM/DMARC setup | | SSL/CORS/caching conflicts | Edge config corrections plus cache rules that protect private data | | No monitoring/alerts | Uptime monitoring setup plus alert routing | | Unsafe deployment flow | Production deployment hardening plus handover checklist |

My delivery window is tight because this work should reduce launch risk fast, not drag into weeks of debate over style changes nobody asked for.

The practical outcome is simple: your mobile app gets into app review with fewer rejection triggers, less chance of broken onboarding, and less risk of exposing customer data while you are trying to sell B2B services.

Mermaid diagram

References

1. roadmap.sh - Cyber Security Best Practices: https://roadmap.sh/cyber-security 2. roadmap.sh - API Security Best Practices: https://roadmap.sh/api-security-best-practices 3. Apple App Store Review Guidelines: https://developer.apple.com/app-store/review/guidelines/ 4. Google Play Console Help - App signing / policy resources: https://support.google.com/googleplay/android-developer/ 5. Cloudflare Docs - Security overview: https://developers.cloudflare.com/security/

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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.*