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

What "ready" means for a paid acquisition funnel

For a bootstrapped SaaS, "ready" does not mean polished. It means a stranger can click an ad, land on your site, trust the domain, sign up, pay if needed, receive email reliably, and not expose your app or customer data in the process.

If I were self-assessing this funnel, I would want to see 5 things before spending on ads:

• The domain resolves correctly with HTTPS only.
• Email deliverability is working with SPF, DKIM, and DMARC passing.
• No secrets are exposed in the frontend, repo, logs, or deployment settings.
• The app is deployed with monitoring, rollback awareness, and basic uptime alerts.
• The first user journey works on mobile with no broken redirects, auth loops, or obvious security holes.

For the first 100 users, the bar is simple: no critical auth bypasses, zero exposed secrets, p95 API latency under 500ms for core signup and onboarding endpoints, and no broken checkout or onboarding paths. If any of those fail, paid traffic turns into wasted spend and support load.

It covers domain, email, Cloudflare, SSL, deployment, secrets, monitoring, and handover so the funnel is safe enough to start buying traffic without gambling on avoidable failures.

Quick Scorecard

| Check | Pass criteria | Why it matters | What breaks if it fails | |---|---|---|---| | Domain and DNS | Root domain and www resolve correctly; no stale records | Users must reach the right app and landing page | Lost traffic, broken links, ad rejection risk | | HTTPS and SSL | All pages force HTTPS; cert valid; no mixed content | Trust and browser security warnings | Conversion drop, blocked forms | | Redirects | One canonical URL per page; no redirect chains over 2 hops | Avoids SEO loss and tracking confusion | Slow load times, broken attribution | | Email authentication | SPF, DKIM, DMARC all pass | Improves inbox placement for onboarding emails | Magic links and receipts land in spam | | Secrets handling | Zero exposed API keys or tokens in code or client bundle | Prevents account takeover and billing abuse | Data leaks, fraud, vendor lockout | | Cloudflare protection | WAF/CDN/rate limiting enabled where relevant | Reduces bot traffic and basic attacks | Signup spam, DDoS exposure | | Deployment safety | Production build matches intended environment variables | Prevents broken auth and wrong API targets | Users hit staging APIs or dead endpoints | | Monitoring | Uptime alerts active for homepage + key API routes | You need fast detection before users complain | Long outages during ad spend | | Performance baseline | Landing page LCP under 2.5s on mobile; core API p95 under 500ms | Paid traffic converts better when fast | Higher bounce rate and worse CAC | | Handover readiness | Checklist documented with owner access list and rollback notes | Lets you operate without guessing later | Slow recovery when something fails |

The Checks I Would Run First

1. Domain routing is clean

Signal: The root domain goes to one intended landing page path. www either redirects to root or vice versa with a single 301.

Tool or method: `dig`, browser checks in incognito mode, and a redirect map review in Cloudflare or your host.

Fix path: I remove conflicting A records, stale CNAMEs, duplicate redirects at the app layer, and old preview URLs. For paid acquisition funnels, I prefer one canonical entry point so ad attribution stays clean and users do not hit redirect chains.

2. SSL is valid everywhere

Signal: Every public page loads over HTTPS with no mixed content warnings. The certificate is valid across all subdomains you use.

Tool or method: Browser dev tools security tab plus a quick scan with SSL Labs.

Fix path: I force HTTPS at the edge through Cloudflare or the host config. Then I replace any hardcoded `http://` asset links inside templates or CMS content. Mixed content often looks minor until payment forms or login widgets fail in production.

3. Email deliverability passes authentication

Signal: SPF passes for your sending provider; DKIM signs outbound mail; DMARC policy exists and aligns with your From domain.

Tool or method: MXToolbox checks plus a real test send to Gmail and Outlook accounts.

Fix path: I set the DNS records correctly and verify alignment across your transactional provider like Postmark, SendGrid, Resend, or SES. If onboarding emails are part of activation flow, this is not optional. A bad setup means users miss magic links or never confirm their accounts.

4. Secrets are not leaking into client code

Signal: No API keys appear in frontend bundles, git history snapshots you still control should be cleaned up if possible), deployment logs ,or public env files.

Tool or method: Search repo history for key patterns; inspect built assets; run secret scanning locally or in CI.

Fix path: Move sensitive values server-side only. Rotate any exposed keys immediately. If a third-party key was ever shipped to the browser bundle by mistake , assume it is compromised because anyone can inspect it.

A simple rule helps:

## Good: server-only
STRIPE_SECRET_KEY=sk_live_...
RESEND_API_KEY=re_...

## Bad: never ship to client
NEXT_PUBLIC_STRIPE_SECRET_KEY=

If you used `NEXT_PUBLIC_` on something secret , treat that as an incident , not a cleanup task.

5. Production deploy points at production services

Signal: Login , billing , database , storage , webhook endpoints ,and analytics all point to production versions only when production is live.

Tool or method: Review environment variables in your host dashboard plus a full signup test from scratch using a fresh email address.

Fix path: I compare staging versus production env vars line by line. Common failure modes are wrong database URLs , stale webhook signing secrets ,or app builds that still call preview APIs. This creates silent data loss rather than obvious crashes , which is worse because it looks like the funnel works until you inspect the records.

6. Monitoring catches failure before users do

Signal: Uptime monitoring pings homepage , login ,and one key API route every few minutes with alerting to email or Slack.

Tool or method: UptimeRobot , Better Stack , Pingdom ,or Cloudflare health checks depending on stack size.

Fix path: I set alerts for downtime , high error rates ,and certificate expiry. For a paid funnel , even 15 minutes of outage during an ad burst can waste budget fast.

Red Flags That Need a Senior Engineer

If you see any of these , I would stop DIYing and bring in Launch Ready:

1. You cannot explain where secrets live.

• If keys exist in local files , CI variables , host dashboards ,and old repo commits all at once , you have drift that needs cleanup plus rotation.

2. Your auth flow uses multiple providers without clear ownership.

• Example: Supabase auth plus custom JWTs plus Stripe webhooks plus magic links. That stack can work , but misalignment causes account duplication or broken sessions.

3. You have already shipped one exposed secret or public staging URL accidentally.

• That means there may be more hidden issues in deployment hygiene .

4. The funnel depends on webhooks for access control .

• If Stripe payment events unlock access but retries are not idempotent , users get charged without access or get access without payment integrity .

5. You are about to spend real money on ads before testing failure states .

• No timeout handling , no empty states , no retry logic , no alerting means paid traffic becomes unpaid QA .

DIY Fixes You Can Do Today

Before contacting me , do these five things yourself if you can:

1. Run a full signup using Gmail and Outlook addresses .

• Confirm confirmation emails arrive within 2 minutes.
• Check spam folder behavior too .

2. Search your repo for exposed secrets .

• Look for `sk_`, `pk_`, `api_key`, `secret`, `token`, `service_role`, and any provider-specific patterns.
• Remove anything sensitive from client-side code immediately .

3. Verify DNS records against your actual provider docs .

• Make sure SPF has only authorized senders.
• Make sure there are no duplicate A records causing random resolution issues .

4. Turn on basic uptime monitoring today .

• Monitor homepage plus `/api/health` if you have one.
• Set alerts to two places if possible: email plus Slack .

5. Test mobile load speed on real data .

• Use Lighthouse mobile mode.
• Aim for LCP under 2.5 seconds on the landing page before paying for clicks .

Where Cyprian Takes Over

Here is how checklist failures map directly to Launch Ready deliverables:

| Failure found | What I fix in Launch Ready | Timeline | |---|---|---| | Broken DNS / wrong domain routing | DNS cleanup, redirects, subdomains setup | Hours 1-8 | | SSL warnings / mixed content / bad certs | Cloudflare setup + SSL enforcement + cache rules | Hours 1-8 | | Spammy onboarding email delivery | SPF/DKIM/DMARC configuration + sender verification | Hours 4-12 | | Exposed secrets / unsafe env vars | Secret audit + environment variable cleanup + rotation plan | Hours 6-18 | | Staging bleeding into production | Production deployment review + env separation + smoke tests | Hours 8-24 | | No alerts / silent downtime risk | Uptime monitoring + notification setup + handover notes | Hours 18-30 | | Weak launch documentation / unclear ownership | Handover checklist with access list + rollback steps + next actions | Hours 30-48 |

My recommendation is simple: if more than two items fail on the scorecard above , do not buy ads yet . Fix the launch surface first .

For bootstrapped SaaS founders targeting the first 100 users , this service gives you enough safety to launch without turning security into a six-week project . You get production deployment discipline without hiring full-time too early .

References

• roadmap.sh Code Review Best Practices: https://roadmap.sh/code-review-best-practices
• roadmap.sh API Security Best Practices: https://roadmap.sh/api-security-best-practices
• roadmap.sh Cyber Security: https://roadmap.sh/cyber-security
• Cloudflare SSL/TLS documentation: https://developers.cloudflare.com/ssl/
• 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.*