Technical SEO Checklist for New Websites: 47 Items Your Developer Must Get Right

Why Technical SEO Must Be Built In, Not Bolted On

The biggest SEO mistake businesses make is treating optimization as something that happens after launch. By the time an SEO specialist is brought in to "fix" a live website, months of potential traffic have been lost, and the fixes often require significant redevelopment. Technical SEO should be baked into the development process from day one. This checklist ensures nothing gets missed.

Crawlability and Indexing (Items 1-10)

• 1. XML Sitemap: Generate and submit an XML sitemap to Google Search Console. For Next.js sites, use the built-in sitemap generation. Update it automatically when new pages are published.
• 2. Robots.txt: Configure robots.txt to allow crawling of all important pages and block administrative, staging, and duplicate content areas. Common mistake: accidentally blocking CSS/JS files.
• 3. Canonical Tags: Every page should have a self-referencing canonical tag. Pages with URL parameters should canonical to the clean version. This prevents duplicate content issues.
• 4. Meta Robots: Ensure no important pages have noindex or nofollow tags accidentally applied. Check both the meta tag and the X-Robots-Tag HTTP header.
• 5. URL Structure: Clean, descriptive, lowercase URLs with hyphens. No underscores, no capital letters, no query parameters for primary pages. Example: /services/web-development not /Services/Web_Development?id=1
• 6. 301 Redirects: If migrating from an old site, map every old URL to its new equivalent with 301 redirects. Missing redirects are the number one cause of post-launch traffic drops.
• 7. Internal Linking: Every page should be reachable within 3 clicks from the homepage. Use descriptive anchor text, not "click here." Build topic clusters with hub pages linking to related content.
• 8. Breadcrumbs: Implement breadcrumb navigation with BreadcrumbList schema markup. This helps both users and search engines understand your site hierarchy.
• 9. Pagination: For paginated content (blog listings, product catalogs), implement proper pagination with rel="next" and rel="prev" hints, or use infinite scroll with proper crawlable fallbacks.
• 10. Orphan Pages: Verify that every page is linked from at least one other page on the site. Pages without internal links are effectively invisible to search engines.

Page Speed and Core Web Vitals (Items 11-20)

• 11. Largest Contentful Paint (LCP): Under 2.5 seconds. Optimize hero images, use proper sizing, and implement preloading for above-the-fold content.
• 12. Cumulative Layout Shift (CLS): Under 0.1. Set explicit width/height on all images and embeds. Reserve space for dynamic content.
• 13. Interaction to Next Paint (INP): Under 200ms. Minimize main thread blocking, defer non-critical JavaScript, and use web workers for heavy computation.
• 14. Image Optimization: Use WebP/AVIF formats, implement responsive images with srcset, and lazy-load images below the fold. For Next.js, use the Image component.
• 15. Font Loading: Use font-display: swap to prevent invisible text during font loading. Preload critical fonts. Consider variable fonts to reduce file count.
• 16. JavaScript Bundle Size: Code-split aggressively. Lazy-load components below the fold. Analyze bundle size with tools like webpack-bundle-analyzer. Target under 200KB for the initial JavaScript payload.
• 17. CSS Optimization: Remove unused CSS. Use tools like PurgeCSS (built into Tailwind CSS). Inline critical CSS for above-the-fold content.
• 18. Server Response Time (TTFB): Under 200ms. Use a CDN, implement server-side caching, and consider edge rendering for static content.
• 19. Compression: Enable Gzip or Brotli compression on the server. Brotli provides 15-20% better compression than Gzip.
• 20. Third-Party Scripts: Audit and defer all non-critical third-party scripts (analytics, chat widgets, tracking pixels). Load them after the page is interactive.

On-Page SEO (Items 21-30)

• 21. Title Tags: Unique, descriptive title tags for every page. 50-60 characters. Include the primary keyword near the beginning.
• 22. Meta Descriptions: Unique meta descriptions for every page. 150-160 characters. Include a value proposition and call to action.
• 23. H1 Tags: Exactly one H1 per page. It should include the primary keyword and clearly describe the page content.
• 24. Heading Hierarchy: Logical H1 > H2 > H3 structure. Do not skip levels. Use headings for structure, not styling.
• 25. Image Alt Text: Descriptive alt text on every image. Include keywords where natural, but prioritize accessibility.
• 26. Open Graph Tags: og:title, og:description, og:image for every page. These control how your content appears when shared on social media.
• 27. Twitter Card Tags: twitter:card, twitter:title, twitter:description, twitter:image for social sharing optimization.
• 28. Schema Markup: Implement Organization, LocalBusiness, Article, FAQ, and Product schema (as applicable) using JSON-LD format.
• 29. Hreflang Tags: If serving content in multiple languages or regions, implement hreflang tags to prevent duplicate content issues.
• 30. Content Length: Primary landing pages should have 1,500+ words of substantive content. Blog posts should target 2,000+ words for competitive keywords.

Mobile and Security (Items 31-40)

• 31. Mobile Responsiveness: Test on real devices, not just browser emulators. Verify tap targets are at least 48px, text is readable without zooming, and no horizontal scrolling occurs.
• 32. Viewport Meta Tag: Include the proper viewport meta tag for responsive rendering on mobile devices.
• 33. HTTPS: SSL certificate properly installed. All HTTP URLs redirect to HTTPS. Mixed content warnings eliminated.
• 34. Security Headers: Implement Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, and Strict-Transport-Security headers.
• 35. 404 Page: Custom 404 page with navigation, search, and links to popular content. Monitor 404 errors in Search Console.
• 36. Favicon: Multiple favicon sizes for different devices. Include apple-touch-icon for iOS.
• 37. Web App Manifest: manifest.json for PWA capabilities and improved mobile experience.
• 38. AMP (Optional): Consider AMP for content-heavy sites targeting Google Discover and news results. Not required for all sites.
• 39. Accessibility: WCAG 2.1 AA compliance. Proper contrast ratios, keyboard navigation, ARIA labels, and screen reader compatibility.
• 40. Cookie Consent: GDPR and CCPA compliant cookie consent banner if serving EU or California users.

Analytics and Monitoring (Items 41-47)

• 41. Google Search Console: Verified and configured. Sitemap submitted. Monitor for errors weekly.
• 42. Google Analytics 4: Properly installed with conversion tracking configured for key actions (form submissions, phone clicks, purchases).
• 43. Core Web Vitals Monitoring: Set up real-user monitoring (RUM) to track CWV performance over time. Use tools like web-vitals library or SpeedCurve.
• 44. Uptime Monitoring: Configure uptime alerts to notify you immediately when your site goes down. Use tools like UptimeRobot or Pingdom.
• 45. Backlink Monitoring: Set up Ahrefs or SEMrush alerts for new and lost backlinks. Monitor competitor link acquisition.
• 46. Rank Tracking: Track keyword rankings for your target keywords weekly. Use tools like Ahrefs, SEMrush, or SE Ranking.
• 47. Error Monitoring: Implement JavaScript error tracking (Sentry, LogRocket) to catch and fix client-side errors that impact user experience.

Let Alpha Quantix Handle Your Technical SEO

This checklist represents the minimum standard for launching a website that is ready to compete in organic search. At Alpha Quantix, every web development project includes comprehensive technical SEO implementation as standard — not as an add-on. Our Next.js builds come pre-optimized for all 47 items on this list, giving your site the strongest possible foundation for organic growth from day one. Get a free technical SEO audit of your existing site and see how you measure up.