Technical SEO Agency | Audits, Fixes and Verification

Updated September 2026 · Written and maintained by the Progression Agency strategy team

A technical SEO agency finds and fixes the things that stop a site from being crawled, indexed, rendered and ranked: crawl waste, index bloat, rendering problems, slow pages, broken structure, duplicate content, hreflang, schema and migrations. Progression Agency provides technical SEO from New York for companies across the United States and worldwide. This page explains what technical SEO covers, what a technical SEO audit service delivers, how fixes get implemented in real codebases and platforms, what changes for ecommerce, enterprise and JavaScript sites, how migrations are protected, what a technical SEO consultant should report, and what it costs.

On this page · 14 sections

What technical SEO covers
The technical SEO audit service
Getting fixes shipped
JavaScript frameworks and rendering
Ecommerce technical SEO
Enterprise technical SEO
Speed and Core Web Vitals
International and hreflang
Migrations and redesigns
Technical SEO for AI search
What a technical SEO agency delivers
How to choose a technical SEO agency or consultant
What it costs: technical SEO
Related services and guides

The short answerTechnical SEO is the plumbing: if search engines cannot crawl, render and index a site efficiently, content and links underperform. A technical SEO agency audits with crawlers, log files and Search Console, prioritizes by impact, writes fixes developers can implement, verifies each one after deployment, and reports the result in indexing, rankings and traffic. The difference between agencies is whether fixes get shipped: we write tickets, work in your platform or codebase where allowed, and re-crawl to prove it.

Ranges on this page are the planning figures Progression Agency publishes; a quote follows a written scope. Nothing here describes a named client or a measured result for one.

What technical SEO covers

Technical SEO areas
Area	What goes wrong	What the fix produces
Crawlability	Crawl waste on parameters, faceted URLs, infinite spaces	Crawl budget spent on pages that matter
Indexing	Index bloat, thin or duplicate pages indexed, important pages not	Clean index of pages that should rank
Rendering and JavaScript	Content or links only visible after JS; hydration issues	Search engines see what users see
Site architecture and internal links	Orphans, deep pages, weak hubs	Authority flows to the pages that convert
Speed and Core Web Vitals	Slow LCP, poor INP, layout shift	Ranking signal met; better conversion
Structured data	Missing, invalid or unsupported schema	Rich results and clearer entity understanding
International	Wrong or missing hreflang, canonical conflicts	Right version in each market
Migrations	Lost redirects, changed URLs, dropped content	Traffic preserved through the change

Companies search for a technical SEO audit service, a technical SEO consultant, technical SEO services, a technical SEO audit, a technical SEO company, a technical SEO expert, crawlability and indexing issues, JavaScript SEO, site migration SEO, Core Web Vitals, log file analysis, schema markup and technical SEO for ecommerce. One engagement covers all of them.

The technical SEO audit service

An audit crawls the site, reads log files and Search Console, tests rendering and speed, checks structure, schema and international setup, and produces a prioritized list of issues with the fix for each, the effort, and the expected effect. It is a deliverable you can hand to developers or have us implement. Our SEO audit service page covers the full audit; this page is the technical half.

Getting fixes shipped

Findings are written as tickets with acceptance criteria; fixes are implemented in WordPress, Shopify, Webflow or a custom codebase where access allows, or handed to your team; each fix is verified after deployment by re-crawl and Search Console. Our WordPress development page and custom development page cover the platforms we work in.

JavaScript frameworks and rendering

React, Next.js, Vue and Angular sites need rendering strategy (server-side rendering, static generation, hydration checks), crawlable links, and testing with how search engines actually render. Our Next.js development page covers the framework side.

Ecommerce technical SEO

Faceted navigation rules, canonicalization of variants, pagination, out-of-stock handling, product schema, feed alignment and speed on large catalogs. Our ecommerce SEO page covers the wider program.

Enterprise technical SEO

Large sites need crawl budget management, log analysis at scale, templated fixes, governance for changes by many teams, and monitoring that catches regressions. Our enterprise SEO page covers the model.

Speed and Core Web Vitals

Field data by page type, fixes in order of impact and proof in conversion rate. Our website speed optimization page covers the project.

Large sites need crawl budget management, log analysis at scale, templated fixes, governance for changes by many teams, and monitoring that catches regressions.

International and hreflang

URL structure by market, hreflang with return links and x-default, canonical alignment and testing. Our international SEO page and the free hreflang checker cover it.

Migrations and redesigns

URL mapping and redirects, content parity checks, staging crawls, launch-day monitoring and post-launch verification. Our website migration page covers the process.

Technical SEO for AI search

AI crawlers need access, extractable content and clear structure; the same technical foundations serve AI answers. Our answer engine optimization page covers the strategy; the free AI crawler access checker tests access.

What a technical SEO agency delivers

Audit with prioritized findings and fixes.
Tickets with acceptance criteria, or implementation where access allows.
Verification of each fix by re-crawl and Search Console.
Monitoring for regressions after releases.
Migration protection when the site changes.
Reporting: indexing, crawl efficiency, speed, rankings and traffic.

How to choose a technical SEO agency or consultant

Ask whether they implement fixes or only list them.
Ask how fixes are verified after deployment.
Ask for experience with your platform or framework.
Ask how they use log files and Search Console, not just a crawler.
Ask who owns the audit and the code. You must.

What it costs: technical SEO

SEO is sold as a retainer sized to the market you compete in. For technical SEO, the tiers below are the planning ranges from our marketing agency pricing guide and our SEO engagement models; the right tier follows an audit of the site and the competition, and the quote follows that.

SEO planning ranges (US figures)
Engagement	Typical range	What it covers
Local SEO, one location	$1,000–$2,500 / month	Google Business Profile, reviews, local pages, technical fixes
Local SEO, multi-location	$2,000–$6,000 / month	Location pages, listings, duplicate suppression
Organic SEO, content-led	$2,000–$6,000 / month	Content program, technical remediation, internal links
Ecommerce SEO	$2,500–$8,000 / month	Catalog structure, faceted navigation, product content
Technical SEO audit	$1,500–$6,000 one-off	Diagnosis and a prioritized fix list
Digital PR and link acquisition	$1,500–$10,000 / month	Outreach and asset production

Every figure above is a planning range already published on this site; the quote for technical SEO follows a written scope, and the same ranges apply across the United States and worldwide.

Pages on this site that sit next to technical SEO and that a buyer usually reads alongside it.

Getting found in search

AI, AEO and what is changing

Paid media and lead generation

Websites and design

Choosing and working with an agency

Software and app development

Web development, platforms and hosting

Social, content and brand

By industry and by situation

Frequently asked questions

What does a technical SEO agency do?

It audits crawlability, indexing, rendering, architecture, speed, schema and international setup, prioritizes fixes, gets them shipped in your platform or codebase, verifies them and reports the effect.

What does a technical SEO audit cost?

A technical SEO audit runs $1,500–$6,000 depending on site size and complexity; implementation and monitoring retainers $1,500–$6,000 per month. Ranges are published; a fixed quote follows a site review.

What is included in a technical SEO audit?

Crawl, log file and Search Console analysis, rendering and speed tests, structure, schema and international checks, and a prioritized list of issues with fixes, effort and expected effect.

Do you implement the fixes?

Yes, in WordPress, Shopify, Webflow or a custom codebase where access allows; otherwise as tickets with acceptance criteria for your team.

How do you verify fixes?

By re-crawl, rendering tests and Search Console after deployment; each fix is closed only when verified.

Do you work with React and Next.js sites?

Yes: rendering strategy, hydration checks and crawlable links.

Do you handle ecommerce technical SEO?

Yes: faceted navigation, variants, pagination, stock handling, product schema and speed at scale.

Do you handle enterprise sites?

Yes: crawl budget, log analysis at scale, templated fixes, governance and monitoring.

Do you protect migrations?

Yes: URL mapping, redirects, parity checks, staging crawls and post-launch verification.

Do you fix Core Web Vitals?

Yes, by field data and impact, with proof in conversion rate.

Do you handle hreflang?

Yes, with return links, x-default and canonical alignment; the free checker tests it.

Is technical SEO enough on its own?

No. It lets content and links work; the full program adds both.

What tools do you use?

Crawlers, log analysis, Search Console, rendering tests and speed field data; the tools are ours, the findings are yours.

How long does an audit take?

One to three weeks depending on site size.

Can you work as a technical SEO consultant with our team?

Yes: audit, tickets, review of your team’s fixes and monitoring.

Do you monitor for regressions?

Yes, after releases, with alerts on indexing, speed and crawl changes.

Who owns the audit and code?

You do.

Is there a contract?

A fixed-price audit, then month to month with 30-day notice for implementation and monitoring.

Do you work with companies outside New York?

Yes, across the United States and worldwide.

What is the first step?

Send the URL and Search Console access. You get a scoped audit quote.

Want to know what your site could rank for?Send the URL and the markets you serve. You get a written audit summary, the keyword map we would build against, and a fixed quote.

Request the audit

Get a free marketing proposal

Tell us what you are trying to grow and we will come back with a plan, not a pitch deck. Same-day reply on weekdays.

Technical SEO Agency: Audits, Fixes and Site Architecture That Let Content Rank