Best Ecommerce Growth Agencies: 5 Top Partners for Scaling Your Online Store

Finding the right agency to help scale your ecommerce business isn't easy. 

There are hundreds of agencies out there, all claiming they can drive revenue and grow your brand. But not all agencies understand the specific challenges of ecommerce, and even fewer have proven track records helping businesses like yours scale profitably.

This guide walks through seven ecommerce growth agencies with different strengths, service models, and ideal customer profiles. 

Some specialize in DTC brands between $10M-$100M in revenue. Others focus on enterprise commerce or specific platforms like Shopify and BigCommerce. 

A few bring deep expertise in retention marketing, while others excel at paid media and acquisition.

We've included agencies at different price points and service levels because the right choice depends on where your business is now and where you're trying to go. A $5M DTC brand has different needs than a $50M enterprise retailer, and your agency should reflect that.

What Makes a Great Ecommerce Growth Agency

Not every marketing agency is built for ecommerce. The best ecommerce growth agencies bring specific capabilities that general marketing firms often lack.

Ecommerce-specific expertise

It goes without saying.

Agencies should understand customer acquisition costs, lifetime value, repeat purchase rates, and how these metrics interact. 

They should know the difference between scaling a subscription business versus a one-time purchase model. They should understand platform-specific constraints and opportunities, whether that's Shopify's checkout limitations or BigCommerce's B2B capabilities.

Data-driven decision making

This often separates strong agencies from weak ones. 

Look for agencies that base recommendations on actual performance data, not gut feelings or best practices borrowed from other industries.

The best agencies use attribution modeling, incrementality testing, and cohort analysis to understand what actually drives growth.

Full-funnel capabilities 

These are increasingly important. Brands that win don't just focus on acquisition or retention - they build systems that work across the entire customer journey.

Whether that's handled by one full-service agency or a coordinated team of specialists depends on your situation, but someone needs to own the big picture.

Platform specialization 

This can be valuable but isn't always necessary. Some agencies specialize deeply in Shopify Plus or BigCommerce Enterprise. Others are platform-agnostic and work across multiple tech stacks. 

Specialists often move faster and know platform-specific workarounds. Generalists bring broader perspective and aren't locked into one ecosystem. Neither approach is inherently better.

Best Ecommerce Growth Agencies

Let’s jump into the list - here are the best growth partners out there for rising ecommerce brands.

Common Thread Collective

Common Thread Collective works with DTC brands doing $10M-$100M in annual online revenue. The agency positions itself as a growth partner focused on building predictable systems for profitable scale.

The team covers strategy, data, acquisition (paid social, search), retention (email, SMS), and creative services. They emphasize a systematic approach to growth and publish extensively through their Ecommerce Playbook content and training programs. Common Thread operates as a Meta Preferred Partner and maintains deep expertise in Facebook and Instagram advertising.

Key capabilities:

• Full-funnel growth strategy and execution
• Paid social buying (Facebook, Instagram, TikTok)
• Search advertising (Google, Microsoft)
• Email and SMS marketing
• Creative production and testing
• Data analytics and attribution

The agency serves established DTC brands in the CPG space and positions its services around building growth systems that clients can either learn to implement themselves or hire Common Thread to execute.

Client testimonials reference ROI improvements and revenue growth. One client noted growth from their previous agency was significant, while others emphasize the team's strategic approach and hands-on support. The agency also mentions working with brands like Heart & Soil, Loop Earplugs, and having helped Igloo Coolers achieve significant year-over-year growth during their DTC transition.

Pricing: Published reviews show project investments ranging from $15,000 to over $350,000, with average hourly rates between $150-$199. Service packages appear to start around $5,000+.

Best for: Mid-market DTC brands ($10M-$100M revenue) that want structured growth systems and are willing to invest in premium service levels.

Tinuiti

Tinuiti is the largest independent full-funnel performance marketing agency in the US, managing over $4 billion in digital media spend with more than 1,000 employees. The agency formed through the 2019 consolidation of Elite SEM, OrionCKB, Email Aptitude, and CPC Strategy.

The agency offers full-funnel capabilities across commerce media, search, social, streaming TV, mobile, and email. Their proprietary technology platform, Bliss Point, measures marketing performance using causal inference and machine learning to identify incremental impact and waste.

Key capabilities:

• Commerce media and retail media networks (Walmart, Target, Instacart, Amazon, 50+ retailers)
• Search advertising (Google, Microsoft)
• Paid social (Meta, TikTok, Snapchat, Pinterest)
• Streaming and linear TV
• Email and CRM marketing
• Mobile app marketing
• Attribution and measurement (Bliss Point technology)

Tinuiti positions itself as particularly strong in connecting commerce experiences across retail media platforms and traditional performance channels. The agency works with major brands including Birchbox, DoorDash, Etsy, The Honest Company, and Terminix.

The agency's scale allows them to maintain partnership relationships with major platforms like Google, Meta, Amazon, Walmart, and Criteo. They're recognized by Forrester Wave for tying Amazon presence to traditional performance marketing channels.

Pricing: Clutch reviews reference minimum project sizes of $5,000+ with average hourly rates between $150-$199 per hour. Actual engagement costs vary significantly based on media spend and scope.

Best for: Mid-market to enterprise brands that need integrated campaigns across multiple channels and retail media networks. Particularly strong for brands selling both DTC and through retail partners.

Groove Commerce

Founded in 2007 and based in Baltimore, Groove Commerce is a full-service agency specializing in ecommerce platform implementations, ongoing development, and growth marketing. They're an Elite BigCommerce Partner, Diamond HubSpot Partner, and Platinum Klaviyo Partner.

The agency takes an integrated approach, combining platform development with marketing services under one roof. Their Velocity framework helps brands launch on BigCommerce in as little as 8 weeks.

Key capabilities:

• Ecommerce platform development (BigCommerce, Shopify Plus, Magento)
• Custom theme design and development
• B2B ecommerce solutions (customer portals, bulk ordering, ERP integration)
• Platform migrations
• SEO and organic search strategy
• Paid media management (Google, social)
• Email marketing and automation (Klaviyo, HubSpot)
• Ongoing website support and optimization

Groove Commerce positions itself as a strategic partner rather than just a service provider. They work with mid-market and enterprise clients and have driven results like 36% conversion rate increases for the US Open Shop, 47% revenue growth for Dippin' Dots, and 409% ROAS for an outdoor retailer.

The agency developed the first HubSpot-BigCommerce integration and created an ecommerce course for HubSpot Academy. Their team reports driving an average 10x ROI within 12 months for clients using HubSpot marketing strategies.

Pricing: Not publicly disclosed, but positioned for mid-market and enterprise clients. Services include both project-based work and ongoing retainers.

Best for: Brands that need both platform development and marketing under one roof, particularly those on BigCommerce or considering migration. Strong fit for B2B ecommerce and businesses wanting HubSpot integration.

Power Digital Marketing

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Power Digital is a full-service digital marketing agency with strong ecommerce capabilities, particularly in performance marketing, SEO, and digital strategy. The agency has grown to serve mid-market and enterprise clients across multiple industries.

Key capabilities:

• Performance marketing (paid search, paid social, programmatic)
• SEO and content marketing
• Amazon marketplace management
• Email and SMS marketing
• Web analytics and conversion rate optimization
• Marketing technology implementation
• Brand strategy and creative

Power Digital brings technology-enabled marketing with a focus on data integration and measurement. They work across the full customer journey from awareness through retention.

Best for: Mid-market brands needing full-funnel digital marketing with strong analytics and reporting. Particularly good for brands that want to integrate multiple channels under unified measurement.

Noticed

Noticed is a conversion rate optimization agency that focuses on testing and iterative improvement for ecommerce sites. They combine analytics, user research, A/B testing, and implementation to systematically improve site performance.

Key capabilities:

• Conversion rate optimization
• A/B testing and experimentation
• User research and behavior analysis
• Site speed and performance optimization
• UX design and implementation
• Analytics setup and analysis

Noticed takes a rigorous, test-driven approach to optimization. Rather than implementing best practices, they test changes specific to your audience and incrementally improve performance through validated learning.

Best for: Brands with meaningful traffic (typically 50,000+ monthly visitors) where small conversion rate improvements create significant revenue impact. Best suited for companies that can commit to ongoing testing programs.

How to Choose the Right Agency for Your Brand

The right agency depends on where your business is now and what you need to improve.

Consider your stage and revenue

Early-stage brands under $5M often can't support full-service agency fees and may be better served by fractional experts or specialists. 

Brands between $5M-$20M typically benefit from growth-focused agencies that can systematize acquisition and retention. Companies over $20M may need enterprise-level agencies with sophisticated attribution and multi-channel capabilities.

Match service scope to your needs

If you need both website development and marketing, a full-service agency like Groove Commerce makes sense. 

If your site is solid but acquisition is weak, a performance marketing specialist like Common Thread Collective or Tinuiti might be better. 

If acquisition works but retention doesn't, look specifically for retention specialists.

Looking for a way to boost retention? If you don’t have a mobile app yet, this is the first place you should look. Learn more about how MobiLoud helps you launch the perfect native app for your store.

Budget alignment matters

Premium agencies like Common Thread Collective often require minimum monthly retainers of $15,000-$30,000 or more. 

Mid-market agencies may start around $5,000-$10,000 monthly. Boutique consultancies might charge by project or offer advisory retainers. 

Make sure the economics work before starting conversations.

Platform compatibility

If you're on BigCommerce and planning to stay there, Groove Commerce's deep platform expertise will accelerate execution. 

If you're platform-agnostic or frequently switch stacks, a platform-agnostic agency might be more flexible.

Final Thoughts

Choosing an ecommerce growth agency is ultimately about finding aligned expertise and a service model that fits your business. 

The best agency for your business depends on your revenue scale, growth challenges, platform, and budget. 

Evaluate agencies based on relevant experience with businesses like yours, not just impressive client lists or case studies from different business models. Ask for references from companies at your revenue level solving similar problems. 

And remember that agency relationships typically take 3-6 months to show meaningful results, so choose partners you can work with long-term.