Launch Ready cyber security Checklist for automation-heavy service business: Ready for first 100 users in marketplace products?.

What "ready" means for a marketplace product aiming for the first 100 users

For an automation-heavy service business, "ready" does not mean polished. It means a new user can sign up, get value, and not expose your data, your customers data, or your inbox to avoidable risk.

For the first 100 users, I would define ready as this:

• The domain resolves correctly across apex, www, and key subdomains.
• Email is authenticated with SPF, DKIM, and DMARC passing.
• The app is deployed to production with environment variables and secrets out of the codebase.
• Cloudflare is in front of the app with SSL on, caching set safely, and DDoS protection enabled.
• Monitoring is live so you know when signups break, emails fail, or uptime drops.
• No critical auth bypasses, no exposed secrets, and no public admin paths.
• Core pages load fast enough to convert: LCP under 2.5s on mobile for the main landing page.
• The onboarding path works end to end for at least 10 test runs without manual rescue.

If any one of those fails, you are not launch ready. You are still in "prototype that can hurt you" territory.

For marketplace products specifically, cyber security matters because your product sits between multiple parties. If access control is weak or automation runs with too much privilege, one bad request can leak data across users or trigger actions on the wrong account.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain routing | Apex, www, and subdomains resolve correctly | Users trust the brand and systems hit the right app | Broken login links, email links fail, lost traffic | | SSL/TLS | HTTPS enforced everywhere | Protects sessions and login credentials | Browser warnings, session theft risk | | DNS records | SPF, DKIM, DMARC all pass | Prevents spoofed email and improves deliverability | Emails land in spam or get rejected | | Secrets handling | Zero secrets in repo or client bundle | Stops credential leaks and account takeover | API abuse, billing fraud, data exposure | | Auth checks | No critical auth bypasses found | Marketplace data must stay isolated per user | Cross-account access and support escalations | | Rate limiting | Login and API abuse throttled | Reduces brute force and bot load | Credential stuffing, downtime, cost spikes | | Cloudflare config | WAF/DDoS protection active | Shields origin from direct abuse | Origin attacks and uptime loss | | Monitoring | Uptime + error alerts are live | You need fast detection before users complain | Silent failures and delayed incident response | | Deployment hygiene | Prod env vars set correctly; staging separate | Prevents accidental test data or broken flows in prod | Data corruption and failed onboarding | | Handover readiness | Checklist documented with rollback path | Makes support manageable after launch | Founder panic during first incident |

The Checks I Would Run First

1. Domain and DNS routing

Signal: `@`, `www`, login subdomain, and transactional email domains all resolve to the intended targets with no stale records.

Tool or method: I check DNS records directly in Cloudflare or your registrar panel, then verify with `dig`, browser tests, and email tests from Gmail and Outlook.

Fix path: Remove duplicate A/CNAME records, set canonical redirects once only, and make sure old staging domains cannot serve production traffic. If you use subdomains for app, docs, admin, or webhooks, each one needs an explicit owner and purpose.

2. Email authentication

Signal: SPF passes with one authorized sender path only; DKIM signs outbound mail; DMARC is at least `p=quarantine` once everything is stable.

Tool or method: Use MXToolbox or similar validation plus a real send test from your app. I also inspect provider settings in Postmark, SendGrid, Resend, Google Workspace, or Microsoft 365.

Fix path: Tighten SPF to avoid too many lookups or broad includes. Turn on DKIM signing at the provider level and publish the correct selector record. Start DMARC in monitor mode if needed for 24 to 48 hours, then move toward enforcement.

A minimal DMARC record looks like this:

v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com; adkim=s; aspf=s

3. Secrets exposure

Signal: No API keys, private tokens, service account JSON files, webhook secrets, or `.env` values appear in Git history or frontend bundles.

Tool or method: Search the repo with secret scanners such as GitHub secret scanning or TruffleHog. Then inspect built assets in browser dev tools to confirm nothing sensitive ships client-side.

Fix path: Move secrets to environment variables in your deployment platform. Rotate anything that was already committed. If a secret touched a public repo even briefly, assume it is burned until rotated.

4. Authentication and authorization boundaries

Signal: One user cannot read another user's records by changing IDs in URLs or API calls. Admin routes are protected by role checks server-side.

Tool or method: I test direct object references manually by editing IDs in requests and URLs. For automated coverage I would add integration tests around tenant isolation and role permissions.

Fix path: Never trust client-side role flags. Enforce authorization at the API layer on every request that touches marketplace data. If there is any multi-tenant logic hidden inside automation workflows, move that check earlier so unauthorized jobs never start.

5. Cloudflare edge protection

Signal: HTTPS forced on all routes; WAF enabled; basic bot protection active; origin IP not publicly exposed where possible.

Tool or method: Review Cloudflare dashboard settings plus origin firewall rules. Then confirm requests still work through Cloudflare only.

Fix path: Turn on full strict SSL where supported. Add page rules or redirects for non-canonical hosts. Rate limit login endpoints if you expect signups from paid traffic because bot traffic will arrive faster than you think.

6. Monitoring for launch day

Signal: Uptime checks fire within minutes; error tracking captures frontend and backend failures; alerts go to a real channel someone watches.

Tool or method: Use UptimeRobot, Better Stack Statuspage/monitoring stack options if you have them already configured properly after deployment review), Sentry), plus log aggregation from your host platform. Run one forced failure before launch so you know alerts actually arrive.

Fix path: Alert on downtime plus elevated error rates instead of raw log noise. Set thresholds around signup failures,, email send failures,, payment webhook failures,,and queue backlogs if automation is part of delivery.

Red Flags That Need a Senior Engineer

If you see any of these,, I would not keep patching it alone:

1. You have no idea where production secrets live. That usually means keys are scattered across local files,, CI variables,,and old deployments.

2. Your marketplace has shared tables without clear tenant isolation. One bad query can expose another customer's orders,, messages,,or automations.

3. Email deliverability is already failing before launch. If welcome emails do not land reliably now,, support volume will spike on day one.

4. You rely on client-side checks for permissions. That is how people discover hidden admin routes,, edit other users data,,or trigger automation they should not control.

5. You cannot explain what happens when a webhook fails. If retries,, dead-letter handling,,and alerting are unclear,, your automations will silently drift out of sync.

DIY Fixes You Can Do Today

1. Audit every domain you own. Write down apex,, www,, app,, api,, admin,, docs,,and mail-related hosts so nothing is forgotten during launch.

2. Remove secrets from any file synced to GitHub. Search for `.env`, `sk_`, `api_key`, `private_key`, `service_account`,and webhook signatures before they leak into a build artifact.

3. Turn on HTTPS-only behavior everywhere possible. Force redirects from HTTP to HTTPS so users never submit forms over insecure transport.

4. Test signup like a stranger would. Use a fresh browser profile,, new email address,,and mobile device flow to catch broken onboarding before users do it for you.

5. Verify email authentication before sending campaigns. Send a test message to Gmail plus Outlook,. then check headers for SPF,DKIM,and DMARC pass results before launch traffic starts.

Where Cyprian Takes Over

Here is how checklist failures map to the deliverables:

| Failure area || Service deliverable || Timeline || Outcome | |---||---||---||---| | Domain routing broken || DNS,,, redirects,,, subdomains || Hours 0-8 || Clean traffic flow to production | | SSL misconfigured || Cloudflare + SSL hardening || Hours 0-8 || No browser warnings,,, secure sessions | | Email auth failing || SPF,,, DKIM,,, DMARC setup || Hours 4-12 || Better deliverability,,, less spoofing | | Secrets exposed || Env vars + secret cleanup || Hours 4-16 || Lower breach risk | | Weak caching / edge config || Cloudflare caching + DDoS protection || Hours 8-16 || Faster load times,,, less origin strain | | Production deploy unstable || Deployment review + prod release || Hours 12-24 || Safer launch cutover | | Missing monitoring || Uptime monitoring + alerting || Hours 16-32 || Faster incident detection | | No handover plan || Handover checklist + runbook || Hours 32-48 || Founder can operate without guessing |

My recommendation is simple: if your goal is the first 100 users in a marketplace product,,, do not spend three days learning DNS edge cases while paid traffic waits.. Buy the sprint if you have any doubt about auth,,, email,,,or deployment safety..

The business trade-off is clear..

Mermaid diagram

References

• roadmap.sh - API Security Best Practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh - Cyber Security Roadmap: https://roadmap.sh/cyber-security
• roadmap.sh - Code Review Best Practices: https://roadmap.sh/code-review-best-practices
• OWASP Top Ten: https://owasp.org/www-project-top-ten/
• Cloudflare Docs - SSL/TLS Overview: 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.*