| TL:DR: Behind every high-ranking website is strong technical SEO. The agencies on this list specialize in site audits, migrations, indexing, and speed optimization to make content discoverable and scalable. |
Your marketing team is publishing consistently. Backlinks are in place. On the surface, everything looks right. Yet traffic refuses to climb and rankings remain buried.
The problem is buried deep in the site. Technical SEO issues, such as slow pages, duplicate URLs, broken redirects, and tangled structures block Google from crawling and indexing your best work. The foundation is weak, so growth splutters.
This is where technical SEO agencies step in. They dive under the hood, fix crawlability, sharpen site speed, and strengthen architecture, making your website search-engine friendly without breaking user experience.
In this article, we spotlight 12 agencies trusted by founders and marketing leaders to turn underperforming websites into reliable growth engines.
12 Top Technical SEO Agencies Driving Results in 2025
Technical SEO is where the strongest agencies prove their worth. These are not the firms writing fluffy blog posts or chasing backlinks. They are the specialists who fix the invisible problems holding websites back, like site speed, crawl errors, broken structures, and migration risks.
The following companies have built reputations for solving these challenges at scale. Each brings a different strength to the table, whether it’s enterprise-level audits, B2B focus, or hands-on site migrations.
- Concurate
- iPullRank
- WebFX
- Thrive Internet Marketing Agency
- Victorious
- Seer Interactive
- Intero Digital
- SmartSites
- Stellar SEO
- Searchbloom
- Sixth City Marketing
- Delante
Let’s dive into each of these companies now, starting with Concurate.
1. Concurate — Content-First SEO Backed by Technical Precision
Concurate is a content marketing agency that helps enterprises build authority through strategic storytelling, programmatic SEO, and high quality backlink ecosystems.
What sets the agency apart is our refusal to treat technical SEO as an afterthought. Every campaign is built on a solid technical foundation with site audits, structured data cleanup, and page speed optimization, included from the start.
Source – Concurate
While many agencies separate content from technical execution, Concurate blends both seamlessly. We do not just recommend fixes, we roll up our sleeves and execute. This includes managing site migrations, improving indexation, and stabilizing backlink profiles.
For one education partner, the mandate started with content creation. But when we identified that legacy applications were slowing page loads, the team guided a full migration to a modern setup. By handling the migration end-to-end and stabilizing the infrastructure, we unlocked growth that had been held back for years.
Our dual role as a content strategist and technical executor makes us uniquely positioned for enterprise clients who expect outcomes rather than excuses. We are best suited for organizations that value thought leadership content while also wanting the assurance of a technically flawless foundation.
Notable Clients: Triangle IP, PQAI, Datacipher, Xoxoday, and GreyB
Pricing is customized and available on request, with engagements shaped around business goals rather than one size fits all packages.
2. iPullRank
iPullRank is an enterprise SEO and content marketing agency known for pioneering Relevance Engineering. Alongside content and strategy, the team has deep roots in technical SEO, handling challenges such as JavaScript rendering, log file audits, large-scale site migrations, and complex architecture builds.
Source – iPullRank
Their approach blends step-by-step technical audits with clear recommendations, making them as strong at execution as they are at communication.
They are best suited for enterprises managing thousands of pages across finance, publishing, and eCommerce.
Pricing: Custom, depending on audit scope and complexity.
Notable clients: American Express, global financial institutions, Fortune 500 publishers.
3. WebFX
WebFX brands itself as a revenue-driven digital marketing agency with nearly three decades of SEO experience. Its technical SEO practice focuses on Core Web Vitals, site speed optimization, mobile performance, XML sitemap creation, and security fixes that improve crawlability and rankings.
Source – WebFX
A key differentiator is WebFX’s proprietary software suite, RevenueCloudFX, which connects technical SEO improvements directly to business KPIs like traffic, conversions, and ROI.
This data-driven layer helps clients make informed decisions and link SEO performance to real revenue outcomes.
Pricing: Transparent packages, with scope-based customization available.
Notable clients: Verizon, Subway, Northrop Grumman, Fujifilm, Hilton.
4. Thrive Internet Marketing Agency
Thrive offers technical SEO focused on removing crawl and index barriers and improving site performance. The team audits page speed, Core Web Vitals, mobile experience, internal linking, XML sitemaps, robots.txt, redirects, duplicate content, and site architecture. They also handle structured data, image and speed optimization, backlink and metadata reviews, penalty recovery, and SEO-friendly website migrations.
Source – Thrive
Beyond fixes, Thrive adds a reporting layer through proprietary tools like Thrive Score and Thrive Stats, and pairs technical work with clear recommendations that map to business goals.
Positioned as a full-service firm, Thrive frames technical SEO as the first step to a better search experience and ties outcomes to conversion and lead quality. They also surface AI visibility offerings and local-business toolkits under Thrive Local.
Pricing: Month-to-month engagement model, scope based.
Notable clients: Farah Law, Nationwide Construction.
5. Victorious
Victorious presents itself as a search-first agency that positions technical SEO at the core of sustainable growth. Their team works on crawlability, indexing, Core Web Vitals, site speed, internal linking, redirects, and mobile responsiveness to ensure that every page is discoverable and easy to use.
Source – Victorious
Beyond fixes, they layer competitive insights, proactive maintenance, and managed WordPress support to keep sites fast, stable, and easy for search engines and AI systems to surface. Their approach extends to Answer Engine Optimization and AI Overviews so content is discoverable beyond traditional SERPs.
Pricing: Custom, tailored to scope.
Notable clients: SoFi, Delta Dental, Salesforce, GE Digital.
6. Seer Interactive
Seer Interactive is a digital marketing agency and Certified B-Corporation that combines SEO, paid media, analytics, and creative services. On the technical side, they focus on building strong website foundations through full SEO audits, log file analysis, schema reviews, Core Web Vitals optimization, content pruning, and international SEO strategy.
Source – Seer Interactive
The team positions itself as more than just auditors. They integrate with in-house development and marketing teams, bridging gaps between marketers and engineers to deliver clear, data-driven fixes.
Seer also emphasizes proactive monitoring, migration support, and tailored roadmaps that align with a company’s broader growth initiatives.
Pricing: Custom, based on scope of technical support and service model.
Notable clients: Latham Pool, YouthBuild Philly, HR Acuity, and other enterprise brands across sectors.
7. Intero Digital
Intero Digital is a full-service digital marketing agency with a strong technical SEO practice. Their approach combines foundational fixes, with ongoing monitoring to ensure long-term stability.
Source – Intero Digital
A differentiator is InteroBOT®, their proprietary crawler that replicates how search engines view a site. It allows their team to spot hidden indexing issues, prioritize fixes, and forecast impact more precisely than standard audit tools.
Alongside this, Intero Digital develops tailored strategies covering sitemaps, robots.txt, schema markup, and Core Web Vitals optimization.
Pricing: Custom, depending on audit depth and integrations.
Notable clients: Cloud software firms, B2B brands, and large-scale ecommerce companies.
8. SmartSites
SmartSites is a US-based digital marketing agency best known for its SEO, PPC, and web design services. Within SEO, its technical audit offering stands out, combining in-house expertise with leading tools like Ahrefs, Screaming Frog, Moz, and proprietary frameworks.
Source – SmartSites
The audits cover crawlability, Core Web Vitals, structured data, sitemaps, redirects, and server-side factors that impact rankings and conversions.
What differentiates SmartSites is its scale of execution. Clients benefit from actionable recommendations, transparent reporting, and end-to-end support that connects technical SEO with overall growth goals.
Pricing: Custom, project-based audits with transparent packages.
Notable clients: Mercedes-Benz of Huntington, Ancestral Supplements, Sharemoney, Mind & Body Health Center.
9. Stellar SEO
Stellar SEO is best known for its custom outreach and white-label link-building services, but it also provides technical SEO support to strengthen site foundations.
Their team runs comprehensive audits to uncover crawlability issues, indexation gaps, poor redirects, and structural inefficiencies that can hold rankings back even when content and backlinks are strong.
Source – Stellar SEO
By combining link acquisition with technical SEO, Stellar SEO ensures websites are both authoritative and technically sound. This dual approach makes it easier for clients to see sustainable improvements in visibility, traffic, and conversions.
Pricing: Varies depending on site size and whether Stellar implements changes directly or partners with in-house teams.
Notable clients: Not publicly listed.
10. Searchbloom
Searchbloom positions itself as a partner, not just a vendor, with technical SEO as one of its strongest capabilities. The agency runs full-scale audits to catch crawl errors, indexation problems, duplicate content, and poor site speed, while also refining site architecture and mobile performance.
Source – Searchbloom
Their team leans on structured data implementation, HTTPS upgrades, and continuous monitoring to build a reliable SEO foundation that supports long-term growth.
Beyond execution, Searchbloom is known for its A.R.T. framework — Authority, Relevance, and Technology — which ties technical optimization directly to search visibility and conversions.
This makes them especially valuable for eCommerce and national brands where scalable, data-led fixes can make or break performance.
Pricing: Custom, based on site size and technical scope.
Notable clients: Granite Seed Company, Acupuncture practices, national eCommerce businesses.
11. Sixth City Marketing
Sixth City Marketing positions technical SEO as the foundation for ROI-focused growth across traditional and AI-powered search. The team audits and fixes speed and Core Web Vitals, mobile responsiveness, redirects and 404s, indexing and noindex hygiene, sitemaps, robots.txt, schema, metadata, duplicate content and canonicals, image weight, caching, and lead-source tracking.
Source – Sixth City Marketing
Their approach is data-led and revenue-first: analyze audience intent, benchmark current metrics, then execute a custom technical plan that protects crawlability, clarifies site architecture, and turns visibility into qualified leads.
Pricing: Custom, scope-based.
Notable clients: M/I Homes, Kent State University, National Church Residences, TYKMA Electrox, Shini USA.
12. Delante
Delante is an international search agency that pairs technical SEO with AI-led visibility. The team implements fixes directly, not just audits.
Strengths include indexation rescue with an in-house indexing tool, Core Web Vitals and speed work, structured data, clean redirects, duplication control, hreflang, and migration support.
Source – Delante
They operate across multiple markets with native execution and offer AISO programs, AI audits, AI search training, and AI visibility monitoring.
Their process is KPI-first and implementation-heavy with monthly reporting, and a robust tool stack for diagnostics and forecasting.
Pricing: Typically from $1,000 to $2,000 per month for technical SEO, scoped to site size, issue count, and implementation depth. Audits and ongoing fixes are budgeted flexibly by phase.
Notable clients: Madison Reed, Phrozen 3D, Best Western, Douglas, ScribeAmerica, Ovoko, Fellowes, Atech, EDUopinions.
Technical SEO Is Non-Negotiable
Every agency on this list shows that technical SEO is the invisible foundation of growth. Without fast load times, clean indexation, and structured data, even the best content and backlinks won’t get you results.
If you want to start improving your website today, here are three simple steps you can take yourself:
- Run a Core Web Vitals check with Google PageSpeed Insights and fix the easy wins like oversized images or unused scripts.
- Submit your sitemap to Google Search Console and make sure important pages are being indexed correctly.
- Audit your site for duplicates and broken links using a free crawler like Screaming Frog and clean them up.
These alone can improve performance for small and mid-sized sites.
But for large websites, enterprise migrations, or global visibility, technical SEO quickly gets too complex to manage in-house.
That’s when having a partner who blends content with deep technical execution makes the difference. Here’s why Concurate is best suited for that role.
Why Choose Concurate for Technical SEO
Concurate may be best known as a content marketing agency, but our work extends far beyond publishing high-quality articles.
Over the years, we have executed programmatic SEO at scale, driven international visibility, strengthened local rankings, and built enterprise search strategies. At the core of this success is our technical expertise.
Every campaign rests on a solid foundation where speed, indexation, structured data, sitemaps, and clean site architecture are treated as non-negotiable. We do not just identify problems, we fix them.
From complex site migrations to backlink audits and recovery, our experts roll up their sleeves to stabilize websites and unlock growth. Clients appreciate that the same team creating thought leadership content is also capable of managing technical SEO under one roof.
The result is consistent visibility, better rankings, and lasting authority across traditional and AI powered search.
Book your consultation today and see how we at Concurate turn technical SEO from a hidden headache into a powerful advantage that drives growth.
