Web Development Project Checklist: From Brief to Launch

Every web development project involves hundreds of tasks across planning, design, development, testing, and launch. Missing critical steps leads to delays, bugs, security vulnerabilities, and poor user experiences.

This checklist covers everything you need from initial brief to successful launch.

TL;DR: The Ten Things Most Checklists Skip

If you are adapting this checklist to your own project, double-check these ten items — they are the ones missing from most competitor templates and cause the largest post-launch fires:

1. Redirect map drafted during QA (not launch day) for every old URL.
2. Accessibility audit with axe-core or Pa11y run against every unique page template, not just the homepage.
3. CSP (Content Security Policy) configured and tested against every third-party script your site loads.
4. Database backup restore rehearsed at least once against a scratch environment before launch.
5. Error monitoring (Sentry, Datadog) with alert thresholds set before traffic, not after the first incident.
6. robots.txt and sitemap.xml manually verified against Google Search Console url inspection for 5-10 key URLs.
7. Analytics events fire on real production pageviews — verified in GA4 Realtime, not just in Tag Assistant.
8. Web Vitals measured on the 75th percentile real-user metric (CrUX), not lab Lighthouse scores.
9. 404 and 500 error templates actually look like the rest of the site (not default framework error pages).
10. Launch-day runbook with DNS TTL lowered 24+ hours in advance and a documented rollback trigger.

Phase 1: Planning and Discovery

Project requirements

• Define project goals and success metrics
• Identify target audience and user personas
• List all required pages and features
• Define content requirements per page
• Determine integrations needed (CRM, payment, email, analytics)
• Establish budget and timeline
• Define roles and responsibilities
• Choose project management methodology (Agile/Scrum/Kanban)

Technical planning

• Choose technology stack (frontend framework, backend, database)
• Define hosting and deployment strategy
• Plan URL structure and information architecture
• Document API requirements
• Plan database schema
• Identify third-party services and APIs
• Set up development environment
• Create Git repository and branching strategy

Content planning

• Audit existing content (if redesign)
• Create content outline for each page
• Plan content migration strategy (if applicable)
• Identify content that needs to be created
• Plan image and media assets needed
• Define brand voice and style guide

Phase 2: Design

UX design

• Create user flow diagrams
• Build wireframes for all unique page templates
• Design navigation structure
• Create interactive prototype
• Conduct usability testing with 5-10 users
• Iterate based on testing feedback
• Define responsive breakpoints
• Plan accessibility features (WCAG 2.1 AA)

UI design

• Define color palette and typography
• Create design system / component library
• Design high-fidelity mockups for all pages
• Design mobile versions of all pages
• Design interactive states (hover, focus, active, loading, error)
• Design empty states and error pages
• Create favicon and app icons
• Prepare design assets for development handoff

Phase 3: Development

Setup

• Initialize project with chosen framework
• Configure TypeScript (if using)
• Set up linting and formatting (ESLint, Prettier)
• Configure CI/CD pipeline
• Set up staging environment
• Set up environment variables management
• Install and configure necessary packages

Frontend development

• Build layout components (header, footer, navigation)
• Implement responsive design system
• Build all page templates
• Implement forms with validation
• Add loading states and skeleton screens
• Implement error handling and error boundaries
• Add animations and transitions
• Implement search functionality (if needed)
• Build interactive components (modals, dropdowns, tabs)
• Ensure keyboard navigation works
• Add skip links and ARIA labels for accessibility

Backend development

• Set up database and create schema
• Build authentication system
• Create API endpoints
• Implement business logic
• Set up file upload handling
• Configure email service
• Implement role-based access control
• Set up background job processing (if needed)
• Build admin panel / CMS

Integrations

• Payment processing (Stripe, etc.)
• Email marketing (Mailchimp, etc.)
• Analytics (Google Analytics 4)
• CRM integration
• Social login (Google, Apple, etc.)
• Maps / location services
• Third-party APIs

Phase 4: Content

• Write or migrate all page content
• Optimize all images (WebP, proper sizing, lazy loading)
• Write meta titles for all pages
• Write meta descriptions for all pages
• Add alt text to all images
• Create Open Graph images for social sharing
• Set up blog/news content (if applicable)
• Create legal pages (privacy policy, terms of service)
• Proofread all content

Phase 5: SEO

• Implement semantic HTML structure (H1-H6 hierarchy)
• Add structured data (JSON-LD) for relevant page types
• Create XML sitemap
• Configure robots.txt
• Set up canonical URLs
• Implement breadcrumbs
• Add internal linking between related pages
• Configure hreflang tags (if multi-language)
• Verify Open Graph tags for social sharing
• Set up Google Search Console
• Submit sitemap to Google
• Verify no orphaned pages
• Check for duplicate content issues

Phase 6: Performance

• Run Lighthouse audit (target 90+ score)
• Optimize images (compression, lazy loading, responsive sizes)
• Minimize JavaScript bundle size
• Enable text compression (gzip/brotli)
• Configure CDN for static assets
• Implement caching strategy
• Optimize web fonts (display swap, subsetting)
• Test Core Web Vitals (LCP < 2.5s, FID < 100ms, CLS < 0.1)
• Enable HTTP/2 or HTTP/3
• Optimize critical rendering path

Phase 7: Security

• Enable HTTPS everywhere
• Implement Content Security Policy (CSP) headers
• Add X-Frame-Options header
• Configure CORS properly
• Sanitize all user inputs
• Use parameterized database queries
• Implement rate limiting on APIs
• Secure environment variables (never in code)
• Enable CSRF protection on forms
• Set secure, httpOnly, sameSite flags on cookies
• Configure security headers (HSTS, X-Content-Type-Options)
• Run dependency vulnerability scan
• Implement proper error handling (no stack traces in production)

Phase 8: Testing

• Cross-browser testing (Chrome, Firefox, Safari, Edge)
• Mobile device testing (iOS Safari, Android Chrome)
• Responsive testing at key breakpoints
• Form validation testing
• Error handling testing
• Accessibility testing (screen reader, keyboard navigation)
• Performance testing under load
• 404 page works correctly
• All links work (no broken links)
• Email notifications send correctly
• Payment processing works in test mode
• User authentication flow works end-to-end

Phase 9: Pre-Launch

• Set up production environment
• Configure production database with backups
• Set up monitoring and alerting (Sentry, Datadog)
• Configure error logging
• Set up uptime monitoring
• Create 301 redirects from old URLs (if redesign)
• Test redirects work correctly
• Verify analytics tracking is working
• Set up conversion tracking
• Final content review and proofread
• Get stakeholder sign-off

Phase 10: Launch

• Deploy to production
• Verify all pages load correctly
• Test forms and conversion actions
• Submit updated sitemap to Google
• Verify SSL certificate is active
• Monitor error logs for first 24 hours
• Monitor page speed in production
• Check Google Search Console for crawl errors
• Announce launch to stakeholders

Phase 11: Post-Launch

• Monitor analytics daily for first 2 weeks
• Watch for 404 errors and broken links
• Track Core Web Vitals in production
• Collect and respond to user feedback
• Fix any bugs that appear in production
• Monitor keyword rankings (if SEO is a goal)
• Plan first iteration based on data
• Schedule regular maintenance (updates, backups, security patches)

Need Help with Your Web Project?

Our web development team follows a rigorous process to ensure nothing falls through the cracks. From planning to post-launch optimization, we handle every detail.

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Launch-Day Runbook Template

A checklist is only half the job. Launch day needs a runbook — a minute-by-minute script so nobody has to make judgment calls at 2 AM when something breaks. Here is a minimal template:

Time (T-)	Action	Owner	Rollback trigger
T-72h	Lower DNS TTL to 300s on old domain records	DevOps	N/A
T-48h	Final content freeze; no more copy edits	Marketing lead	N/A
T-24h	Backup production database; verify restore works	Backend lead	N/A
T-4h	Deploy final build to production (dark); smoke test via /tmp URL	Full team	1+ critical smoke test fails
T-1h	Team standup: go/no-go decision	Project lead	Any P0 bug outstanding
T-0	DNS cutover; redirect map activated	DevOps	—
T+15m	Verify 10 key URLs; check Sentry for new error spikes	QA	Error rate > baseline × 5
T+1h	Verify Search Console can fetch new sitemap; submit manually	SEO	Sitemap fails validation
T+24h	Full regression pass on staging-imported prod	QA	Any critical flow broken
T+72h	Close incident bridge if clean	Project lead	—

Rollback Criteria (Document Before Launch)

Every launch needs pre-agreed rollback triggers. Decide these while calm, not during the incident:

• Error rate more than 5x baseline sustained 10 minutes → rollback.
• Page load times more than 2x baseline on 75th percentile → rollback.
• Any checkout / signup / payment flow failing end-to-end → rollback.
• Organic traffic down more than 50% at 48 hours → investigate redirect map before rollback.

Related Resources

• Website Redesign Guide
• Best Web Development Frameworks 2026
• How Much Does Custom Software Development Cost?
• On-Page SEO Checker

Frequently Asked Questions

How long does a standard marketing site project take end-to-end?

A standard 15-25 page marketing site on Next.js, Webflow, or WordPress typically takes 8-14 weeks from kickoff to launch including discovery, design, build, content, and QA. Promises under 6 weeks usually skip discovery or QA. Over 20 weeks usually means scope grew without a scope change order.

What's the most skipped pre-launch step?

Accessibility testing. Roughly 70-80% of websites fail basic WCAG 2.1 AA checks at launch, exposing the business to ADA lawsuits in the US (which averaged $20-75K in settlements in recent years). Budget 1-2 days of a11y review before launch; it's cheaper than even a single demand letter.

How much QA time should I budget?

15-25% of total project time should be QA — for a 12-week project, that's 2-3 weeks of dedicated testing and bug fixing across browsers, devices, and edge cases. Teams compressing QA to 3-5 days ship with the longest post-launch bug tails (typically 4-8 weeks of hotfixes).

What's the biggest launch-day mistake?

Deploying without 301 redirects mapped for the old URL structure. Losing 20-40% of organic traffic overnight from missing redirects is the most common preventable disaster in web redesigns. Build the redirect map during QA, not launch day, and test every old URL in staging.