A technical SEO audit for search engines to see you

A technical SEO audit is a focused diagnosis of the engineering and infrastructure factors that decide whether search engines can crawl, render, index, and rank a website. The Illucrum technical audit runs 36 checks across nine areas: crawlability and indexation, site architecture and URLs, JavaScript rendering, speed and Core Web Vitals, mobile and page experience, security and HTTPS, structured data and directives, international and parameter handling, and machine and AI access. The output is a written report with scored severity and prioritised fixes, delivered in 3 to 5 business days. It is the engineering layer only; it does not include keyword strategy, content, or competitor analysis.

• 01

  Large or complex sites

  Sites with thousands of URLs, where crawl budget, index bloat, and architecture quietly suppress rankings.

• 02

  JavaScript-heavy applications

  Single-page apps and client-rendered sites, common with startups and SaaS teams, where content the user sees never makes it into the index.

• 03

  After a migration or replatform

  When redirects, canonicals, and indexation need verifying before traffic erodes.

If you need keyword strategy, content depth, and competitor positioning as well, a full audit is the closer fit: the SaaS SEO audit, e-commerce SEO audit, or website SEO audit each include the technical layer plus the strategic sections this focused audit leaves out.

* Discount offered to the first clients 10 clients in exchange for a review on clutch.co. 9 offers left

Need keyword, content, and competitor depth as well? A full audit includes the technical layer plus the strategic sections: see the website SEO audit, SaaS SEO audit, or e-commerce SEO audit.

For pricing across every audit type, see the pricing page.

1. Crawlability and indexation (7 checks)

   Robots.txt configuration, XML sitemap health, index coverage and excluded pages, HTTP status codes and server errors, redirect chains and loops, crawl budget and index bloat, and orphan pages. The gap between what is submitted and what is actually indexed. Most quiet ranking suppressors hide here.

2. Site architecture and URLs (5 checks)

   URL structure and consistency, canonicalisation and duplicate URLs, internal linking and link equity flow, site depth and click distance, and pagination handling. Whether the most important pages are reachable, reinforced, and not competing with duplicates of themselves.

3. Rendering and JavaScript (3 checks)

   JavaScript rendering and content parity, render-blocking resources, and lazy-loading of critical content. The routes that render fine for a user but return an empty shell to a crawler; a common cause of quietly de-indexed app subdomains.

4. Speed and Core Web Vitals (5 checks)

   Page speed on mobile and desktop, Largest Contentful Paint, Interaction to Next Paint, Cumulative Layout Shift, image optimisation and next-gen formats, caching, compression and CDN, and third-party script weight.

5. Mobile and page experience (3 checks)

   Mobile responsiveness, viewport and tap target sizing, and intrusive interstitials. Mobile is where most traffic now sits and where Google indexes from.

6. Security and HTTPS (4 checks)

   HTTPS enforcement and SSL certificate health, mixed content, security headers (HSTS, required.csP), and exposed sensitive files and endpoints.

7. Structured data and directives (3 checks)

   Structured data validity and rich result eligibility, meta robots directives, and social meta tags. Where markup is malformed or missing on templates that could earn enhanced listings, and where a stray directive is telling Google not to bother.

8. International and parameter handling (3 checks)

   Hreflang implementation and reciprocity, www versus non-www and protocol consistency, and parameter and faceted URL handling.

9. Machine and AI access (3 checks)

   AI crawler directives (which answer engines you are allowing or blocking, often unintentionally), llms.txt and machine-readable signals, and entity structured data (Organization and sameAs). The technical layer of GEO, without the query and content work the site-type audits cover.

1. Intake

   A short brief: the site, the stage, the question you want answered. WhatsApp or email; no calls required.

2. Crawl and tooling

   The site is crawled and analysed across the standard toolset (Google Search Console, PageSpeed, SEOptimer, structured-data validators).

3. Manual Research

   We research your business, industry, we read your website, so we are sure we have a clear picture.

4. Analysis

   Once the data is gathered, it's time to analyze it. The analysis is done manually, no AI.

Full process detail at How an Illucrum SEO audit takes shape.

• 01

  One process, adapted to each client

  The templates are not rigid. If we think breaking the pattern will be more useful, we are happy to adapt and deliver the audit you need.

• 02

  Source-backed methodology

  Every benchmark referenced in the report has a citable source. The full SEO facts list is published openly at SEO facts and statistics.

• 03

  Written-first delivery

  No retainer trap, no sales call, no calendar block. WhatsApp, email, written report. A debrief call if you need it. That is the whole engagement.

See the general SEO audit questions for more.

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