Top Shopify Plus Agencies For High-Volume Merchants
Daria Pohrebniak
Marketing Director - Reverb
26.06.2026
Running a high-volume Shopify store is a different game from launching a simple online shop.
Once orders, traffic, SKUs, apps, markets, and customer expectations start growing, small technical issues can quickly turn into lost revenue. That is why choosing the right Shopify Plus agency matters.
Reliable Shopify Plus agencies do more than design attractive storefronts. They can help with migrations, integrations, conversion rate optimization, performance, retention, B2B workflows, international selling, and long-term ecommerce growth.
In this list of the top Shopify Plus agencies for high-volume merchants, we’ve gathered agencies that show clear experience with complex projects and can help ambitious brands build and scale their ecommerce operations.
Best Shopify Plus Agencies For High-Volume Merchants
Realm is a Shopify-focused agency founded in 2007 by one of Shopify’s early experts. The team has built hundreds of Shopify stores for clients across the United States and beyond. Realm works with Shopify and Shopify Plus merchants on store setups, migrations, custom theme design, app development, Shopify POS, SEO, content, digital marketing, and conversion optimization.
As the best Shopify Plus development agency, Realm stands out for its practical ecommerce experience and focus on building stores that are easy to shop and designed to convert. Realm’s long track record, multiple 5-star reviews, and expertise across different types of Shopify projects make it a strong choice for brands that need a combination of technical support and clear strategic guidance.
Services and expertise: Shopify Plus development, Shopify theme development, Shopify app development, marketing strategy, digital strategy, search engine optimization
Team size: up to 10 experts
Location: Hamel, MN, USA
Portfolio: Good Earth, SYLTBAR, Lash & Wax OC, Sunrise Flour Mill, Freewaters Footwear, Fullflight Racing, Bille Leather, Bodyblade, Via Florelle, and others
A certified Shopify Premier Partner, Wecanfly specializes in complex Shopify Plus migrations for established brands moving from Magento, PrestaShop, BigCommerce, WooCommerce, and custom systems. By combining technical architecture and conversion-focused design, the agency helps merchants effectively handle challenging data and SEO migrations.
Wecanfly also boasts in-depth integration expertise, including ERP, PIM, CRM, shipping, and marketplace connections. Beyond Shopify Plus, the team specializes in UX/UI design, headless commerce, app development, speed optimization, CRO, ongoing maintenance, and other related services. If you’re looking to hire Shopify Plus development experts to help you scale on a stable and well-performing Shopify Plus setup, consider reaching out to this team.
Portfolio: Naturopathica, Optisofa, Bernstein, Eenox, Shoepassion, Global24, Monolith, God Save Queens, The Odder Side, Le Collet, Berries&Co, L’Occitane, and others.
Elogic Commerce is a good fit for mid-market and enterprise companies with complex B2B or B2B2C commerce needs. Founded in 2009, the agency works with manufacturers, distributors, wholesalers, and hybrid B2B/B2C brands. Its Shopify Plus work covers B2B portals, ERP integrations, global multi-market rollouts, checkout extensibility, custom app development, and platform consulting.
The agency’s main value is in handling the harder parts of commerce architecture: ERP, CRM, PIM, OMS, WMS, marketplace, and middleware integrations, along with replatforming, performance recovery, tech-debt cleanup, and long-term support. With 200+ specialists, 500+ completed projects, and clients such as HP Inc., TeamViewer, Gillette, and BUFF, Elogic Commerce earns its place among the top Shopify Plus agencies for high-volume merchants.
Services and expertise: Shopify Plus development, Shopify Plus migrations, ERP integration, ecommerce architecture audits, CRO, DevOps
Team size: 200+ experts.
Location: Tallinn, Estonia
Portfolio: HP Inc., HanesBrands, TeamViewer, Gillette, BUFF, Siemens, Philips Healthcare, Bvlgari, Vodafone, Armacell, Benum, Accenture, PetHQ, Christy, and others.
The next well-known company on our list, Avex Designs, partners with high-growth ecommerce brands that need a stronger customer experience and a clearer path to scale. As a Platinum Shopify Agency Partner and Shopify Plus Partner, Avex designs, builds, and optimizes ecommerce websites for DTC brands in fashion, lifestyle, beauty, and home goods. Its client list includes names such as KITH, Hugo Boss, Enjoy Life, Simmons Bedding, Marchesa, and Undefeated.
The agency’s work goes beyond storefront design, covering Shopify migrations, systems integrations, commerce architecture, CRO, analytics, retention marketing, loyalty programs, subscriptions, B2B commerce, and international expansion. This makes Avex a good match for high-volume brands whose traffic is growing but whose performance, customer journey, or technology stack needs improvement.
Services and expertise: Shopify Plus development, ecommerce strategy, UX/UI design, replatforming, CRO, analytics, retention marketing, headless commerce.
Team size: up to 50 experts
Location: New York, NY, USA.
Portfolio: AriZona Beverages, TYR, UNITE Hair, Tru Earth, FILA, Vitality, Novus Shoes, Hugo Boss, Equinox, Homage, Bonafide Health, Marchesa, Kith, De Soi, and others.
Swanky is a full-service Shopify Plus agency with teams in the UK, Australia, and France. The agency helps ambitious brands move to Shopify Plus and then supports their growth through design, development, CRO, marketing, and long-term ecommerce strategy.
With more than 15 years of experience, Swanky has worked on Shopify Plus projects of different sizes and levels of complexity, including replatforming, international ecommerce, subscription websites, custom integrations, and full-funnel optimization.
The team also provides SEO, paid ads, email, SMS, content, branding, and ongoing support, which makes it a good fit for merchants looking for a single partner across build and growth. Swanky is especially relevant if your goal is to improve conversions, enter new markets, manage subscriptions, and keep the store performing as your business scales.
Services and expertise: Shopify Plus migrations, Shopify development, CRO, digital marketing, branding, Shopify integrations, search engine optimization, paid ads, email, SMS, content
Team size: up to 250 experts
Location: Exeter, UK
Portfolio: FutureYou Cambridge, Natural Instinct, Mr. Fothergill’s, Saddleback, Boda Skins, Mutimer, Initio Parfums Privés, Bower & Bloom, The Pulse Boutique, and others
Established by former merchants, Ambaum is a Shopify Plus Partner agency with a practical view of what it takes to run and scale an ecommerce business. Since its launch in 2016, Ambaum has combined Shopify Plus development, technical leadership, backend integrations, UX optimization, and growth support for brands with complex operational needs.
Ambaum’s services include theme customization, fractional CTO support, ERP, CRM and OMS integrations, B2B and wholesale workflows, tiered pricing, net terms, portals, data syncs, analytics alignment, and AI enablement. The agency’s clients are high-volume merchants in the parts, food and beverage, retail, home goods, and consumer products sectors, where catalog complexity, inventory, subscriptions, compliance, logistics, and custom buyer journeys are difficult to manage.
Services and expertise: Shopify Plus development, theme customization, web development, fractional CTO, UX optimization, growth marketing, AI enablement
Team size: up to 50 experts
Location: Burien, WA, USA
Portfolio: Discovery Kitchen, BulletProof, Fantastapack, Deep Sentinel, Pro Compression, Girlfriend Collective, Inside Weather, Hammerhead, and others
Superco is a Shopify Platinum Partner agency that works with high-growth startups, mid-market companies, and enterprise brands, covering strategy, UX/UI design, Shopify Plus development, migrations, CRO, SEO, CRM, retention, and ecommerce management. Superco has first-hand experience moving brands to Shopify from other platforms, as well as building bespoke Shopify themes and managing integrations.
The agency works mainly with UK, US, and EU brands in health and wellness, beauty, fashion, food and drink, and luxury, with clients including Represent, Puresport, Minor Figures, Monpure, Reebok, Kopparberg, Guinness World Records, and Ceva Sante Animale. If you’re a high-volume merchant looking to optimize the customer journey, improve conversions, strengthen retention, and build a practical roadmap for growth, Superco is an option worth considering.
Based in London, Eastside Co is a full-service Shopify Plus ecommerce agency founded in 2012 and one of the first UK agencies accredited as a Shopify Plus Partner. With an in-house team of more than 50 designers, developers, marketers, and ecommerce specialists, the agency works with brands at different stages of growth, from startups to enterprise businesses.
The agency’s services cover Shopify web design, bespoke Shopify Plus development, migrations, app development, priority support, discovery audits, SEO, PPC, social media, email marketing, and wider ecommerce strategy. Combining Shopify Plus technical knowledge with design, growth strategy, and ongoing support, Eastside Co is a good fit for merchants that want one long-term partner across store build, performance, and marketing.
Services and expertise: Shopify Plus development, app development, ecommerce strategy, search engine optimization, pay-per-click, social media advertising, email marketing
Team size: 50+ experts
Location: London, UK
Portfolio: Carex, Ford, Chelsea FC, Trunk Clothiers, Missoma, Wild Deodorant, Absolute Collagen, Chelsea Peers, Lounge Underwear, and others
Teplin is a Shopify and Shopify Plus agency focused on helping ecommerce brands improve conversion, retention, and overall store performance. Established in 2015, the agency works on both one-time projects and ongoing retainers, covering Shopify Plus development, CRO, UX audits, store optimization, custom apps, integrations, speed improvements, and migrations from WooCommerce, Magento, and PrestaShop.
Teplin is especially useful for brands that already have a Shopify store but need to make it faster, easier to use, and better aligned with current campaigns and growth goals. Its team can handle everything from redesigns and checkout flow improvements to bug fixes, new features, third-party integrations, upsells, bundles, promo sections, and regular A/B testing.
Services and expertise: Shopify Plus development, UX/UI design, CRO, store optimization, custom apps and integrations, performance and speed optimization
Team size: up to 50 experts
Location: Barcelona, Spain.
Portfolio: Quantum Padel, Snapchat, THRSTY, Ovrload, StoryKeeper, Nordik Recovery, Gadget Centre, Mouf, Homeleon, Shell, Lego, Cartier, and others
Metacake is an ecommerce growth team with more than 25 years of experience helping brands grow through strategy, design, development, marketing, email, and conversion optimization. As one of the original Shopify Plus partners, the agency has worked with more than 300 brands, including household names like Old Spice, Nike, P&G, Dr. Axe, The Daily Wire, and Gibson.
The agency’s services cover Shopify Plus, BigCommerce Enterprise, WordPress, store and platform migration, ERP and system integrations, business intelligence, ecommerce management, and sales channel strategy across DTC, wholesale, and marketplaces. Metacake is a partner to consider for merchants whose growth depends on paid traffic, customer lifetime value, email revenue, conversion work, and a clear ecommerce strategy.
Services and expertise: Shopify Plus development, ecommerce strategy, CRO, paid marketing, SEO, email marketing, customer lifetime value strategy, analytics and business intelligence, ecommerce management
Team size: up to 50 experts
Location: Franklin, TN, USA.
Portfolio: Old Spice, Nike, P&G, Tony Robbins, Dr. Axe, The Daily Wire, Gibson, HealthStream, Midland Radio, Skin Pharm, Check Depot, and others.
Conclusion
Before choosing a Shopify Plus agency, analyze your store’s actual needs. If you are moving from another platform, choose a team with strong migration and technical architecture experience. If you struggle with stalled growth, look for CRO, retention, analytics, and marketing support. Also, take your time to review case studies, client types, minimum project size, and the kind of support the agency offers after launch.
We hope our list of the best Shopify Plus agencies for high-volume merchants helps you find an agency whose experience matches your current challenges.
If you want to feature your Shopify Plus agency on this list, email us or submit a form in the Top Choices section. After a thorough assessment, we’ll decide whether it’s a valuable addition.
