Pre-Launch Web Application Checklist: 25 Things to Verify Before Going Live

Shipping a web application to production is the moment everything stops being theoretical. Bugs become incidents, slow queries become customer complaints, and a missing security header can become tomorrow’s post-mortem. At coding4.net, we’ve launched dozens of production applications, and every single one taught us that a solid web application launch checklist is the difference between a calm Tuesday morning and an all-hands firefight.

This guide is written for developers, DevOps engineers, and project managers who want a practical, no-fluff list of what to verify before flipping the DNS switch. No marketing platitudes, no “don’t forget to proofread” reminders. Just the technical and operational checks that actually matter in 2026.

Why a Pre-Launch Checklist Matters

Most launch failures aren’t caused by exotic bugs. They’re caused by forgotten basics: an expired certificate, a missing environment variable in production, a backup job that nobody tested, or a CORS rule that blocks the payment provider. A checklist forces you to slow down and verify the boring stuff that breaks expensive things.

The checklist below is split into seven categories so you can assign owners and run it as a gated release process.

The 25-Point Web Application Launch Checklist

1. Security Headers and HTTPS

1. Valid SSL/TLS certificate installed with auto-renewal (Let’s Encrypt, ACM, or your CA). Verify expiration date and chain on all subdomains.
2. HSTS enabled with a sensible max-age (start at 6 months, then bump to 2 years once you’re confident).
3. Content Security Policy (CSP) defined and tested in report-only mode before enforcement.
4. Standard security headers set: X-Content-Type-Options: nosniff, Referrer-Policy, Permissions-Policy, X-Frame-Options or frame-ancestors via CSP.
5. Secrets are not in the repo. Verify with a scanner like Gitleaks. Rotate any credential that ever touched a commit history.

2. Authentication and Access Control

6. MFA enforced on admin panels, cloud consoles, CI/CD, and the domain registrar.
7. Rate limiting and brute-force protection on login, password reset, and any public API endpoint.
8. Session and cookie flags correct: HttpOnly, Secure, SameSite.

3. Backups and Disaster Recovery

9. Automated database backups running on a schedule, with retention defined.
10. Restore tested at least once. A backup that has never been restored is a hope, not a backup.
11. Off-region or off-account copy for ransomware and account-compromise scenarios.

4. Monitoring, Logging and Alerting

12. Error monitoring configured (Sentry, Rollbar, Bugsnag, or equivalent) with source maps uploaded for the production build.
13. Uptime monitoring on the homepage, login, and at least one critical API endpoint, from multiple regions.
14. Centralized logs with retention and a search interface. Sensitive fields (passwords, tokens, PII) must be redacted.
15. Alerting routed to a real human, not just an inbox nobody reads. Define on-call rotation if the app is business-critical.

5. Performance and Scalability

16. Lighthouse / Core Web Vitals audit passed on the main public pages. Aim for green LCP, INP, and CLS.
17. Load test executed against a production-like environment using k6, Artillery, or Locust. Know your breaking point before users find it.
18. Caching layers verified: CDN, HTTP caching headers, application cache, database query cache.
19. Database indexes reviewed for the queries that actually run in production. Run EXPLAIN on the slow ones.

6. SEO and Discoverability Basics

20. robots.txt and sitemap.xml deployed and pointing to the canonical domain.
21. Canonical tags, meta titles and descriptions set on every indexable page. Confirm staging is not indexable (no leaked noindex on production, no missing noindex on staging).
22. Open Graph and Twitter Card tags validated with the official debuggers.
23. Analytics installed (GA4, Plausible, PostHog) and consent banner wired correctly for GDPR / ePrivacy compliance.

7. Deployment and Rollback Plan

24. One-command rollback available. Whether it’s a previous Docker tag, a blue/green switch, or a feature flag kill, the team must know exactly how to revert in under 5 minutes.
25. Runbook written and shared: who deploys, who watches dashboards, who communicates with users if something goes wrong, and the exact commands to run.

Quick Reference Table

Category	Owner	Tools we recommend
Security headers / SSL	Backend / DevOps	securityheaders.com, SSL Labs, Mozilla Observatory
Backups	DevOps	Native cloud snapshots, restic, pgBackRest
Error monitoring	Backend + Frontend	Sentry, Rollbar, Datadog
Performance	Frontend + Backend	Lighthouse, WebPageTest, k6
SEO basics	PM / Frontend	Search Console, Screaming Frog, Ahrefs
Rollback	DevOps	Feature flags (Unleash, LaunchDarkly), blue/green deploys

What Most Checklists Get Wrong

Generic launch checklists tell you to “check your links” and “compress your images”. Useful for a brochure site, useless for a real web application. The items that bite production apps are almost always:

• An environment variable set in staging but not in production.
• A cron job, queue worker, or webhook that nobody verified after deploy.
• An API rate limit on a third-party provider that only triggers at scale.
• A database migration that locks a table for 40 seconds in production data volumes.
• A logging library that prints user passwords in clear when an exception bubbles up.

Walk through every one of these explicitly, even if it feels paranoid.

Launch Day: The 60-Minute Window

1. T-60 min: freeze deploys, announce launch in the team channel, open dashboards.
2. T-30 min: final database backup, verify rollback artifact is ready.
3. T-0: switch DNS / flip feature flag / promote release.
4. T+5 min: smoke test critical user flows manually (signup, login, checkout, key API call).
5. T+30 min: review error rates, latency, and 5xx counts. If anything is off, rollback without ego.
6. T+24 h: post-launch retrospective. Update the checklist with what you missed.

FAQ

How long before launch should I run this checklist?

Start at least two weeks before go-live. Security headers, load tests, and backup restore drills take real time, and you don’t want to discover a blocker the night before launch.

Do I really need a rollback plan if I have good tests?

Yes. Tests catch known issues. Production catches the unknown ones: traffic patterns, third-party outages, data shapes you never imagined. A rollback plan is your insurance policy.

Is this checklist overkill for a small SaaS or MVP?

No. Items 1 to 15 are non-negotiable even for an MVP. Skip the load testing and the multi-region backups if you must, but never skip SSL, backups, error monitoring, and a rollback path.

What’s the single most-skipped item on launch day?

Restoring a backup to verify it works. Teams set up backups, then never test them. The first restore should never happen during an incident.

Should staging be identical to production?

As close as you can reasonably afford. Same runtime versions, same database engine and version, same environment variable names, similar data volumes for performance-sensitive tests. Differences between staging and production are where launch-day surprises live.

Final Thoughts

A great launch is a boring launch. If you’ve worked through this web application launch checklist, the day you go live should feel like flipping a switch you’ve already flipped a dozen times in your head. Save this page, fork it into your team’s wiki, and adapt it to your stack.

Need help auditing a production launch or building a CI/CD pipeline that bakes these checks in automatically? Get in touch with the coding4.net team and we’ll walk through it with you.