Merchants rarely move to Shopify Plus for speed or theming. They move for checkout control, wholesale channels, multiple storefronts under one estate and the scripting headroom standard plans withhold. The selection test is therefore specific: the agency should have shipped those capabilities in production, not merely built storefronts on a plan that happened to be Plus.
Judged on that test, Brainvire is a reasonable starting point, since its Shopify Plus Development Services cover checkout extensibility, B2B, Markets and multi-store alongside the back-office integrations those features depend on. Plus capabilities surface integration gaps quickly, where a broader engineering bench earns its place.
The nine companies below bring different strengths to that brief. They are options rather than a ranked field, and any Shopify Development Company USA buyers consider should be measured against the Plus features their roadmap actually needs.
1. Brainvire
Brainvire positions itself as a US-based Shopify Plus Partner with Shopify Expert status, operating from Irving and Plano in Texas and Hicksville in New York, with delivery offices in Dubai, Mumbai and Singapore. It was named a Clutch Top Shopify Company, United States, 2026, and a Deloitte Technology Fast 500 honoree.
Its Shopify partner page reports 700+ eCommerce projects delivered, 500+ global B2B clients and 14+ years engineering commerce platforms, with a 4.8 out of 5 client rating from 500+ reviews. A separate strip cites 95% client retention, relevant for engagements running past a single launch.
Breadth behind the storefront distinguishes it at Plus scale. Brainvire is an Odoo Gold Partner and an Adobe Solution Partner, and integrates Shopify with Odoo, SAP, NetSuite and Microsoft Dynamics. Its Cole Haan work connected Shopify to Microsoft Dynamics ERP through middleware, with Carriyo handling fulfillment.
Shopify Services
- Shopify Plus Implementation
- Headless (Hydrogen & Oxygen)
- B2B on Shopify Plus
- Checkout Extensibility & Apps
- Platform Migration to Shopify
- ERP, OMS & PIM Integration
- Markets & Multi-Store
- Conversion & Managed Support
Those Shopify Plus Development Services map to the reasons merchants upgrade. Checkout extensibility addresses control at the final step, B2B and Markets open wholesale and regional selling, and integration keeps pricing, inventory and order data consistent across channels.
Industries
Plus requirements differ by sector. Brainvire works across:
/01 Retail & eCommerce
/02 Healthcare
/03 Finance & Fintech
/04 Automotive
/05 Real Estate
/06 Logistics
/07 Media
/08 Education
Brainvire Shopify Migration Services are framed conservatively: low-risk moves off Magento, legacy and self-hosted platforms with validated data and preserved SEO equity. Named clients include DKNY and TentAndTable. It suits merchants treating Plus as an operating platform rather than a redesign.
2. Shero Commerce
Shero Commerce states 500+ projects and 98% client retention, figures that matter on Plus because checkout logic and B2B rules need ongoing ownership, not a handover. Shero lists its status as Shopify Premier Partner.
From Red Hook, New York, with London, Helsinki and Tirana offices, it builds Plus stores and migrations, hybrid B2B and DTC estates, custom apps, and integrations across ERP, OMS, WMS, CRM and PIM. Benchmade Knife Company is a client.
3. Avex Designs
International expansion and multi-market storefronts are a named capability at Avex Designs, one of the clearest reasons merchants buy Plus. It describes itself as a Platinum Shopify Plus Partner, based in New York.
Alongside that it offers Plus design and development, replatforming, systems integration, CRO, retention marketing and B2B commerce, naming Hugo Boss and Calvin Klein.
4. Sweden Unlimited
Branding and content are produced alongside the storefront at Sweden Unlimited, so a Plus rebuild does not stall waiting on assets from another agency. The studio states that it is a Shopify Premier Partner.
Its work covers theme design and custom development, replatforms, integrations, design systems, CRO and A/B testing, with Mansur Gavriel and Assouline named.
5. Anatta
Anatta states more than $3.14 billion in GMV migrated onto Shopify, a claim that speaks to replatforming at Plus scale rather than greenfield builds. Anatta states Shopify Platinum Partner status and works from Austin.
Its practice covers enterprise Plus development, composable and headless commerce, subscription engineering and market expansion, targeting brands above $50 million in revenue. Dollar Shave Club and Vuori are clients.
6. Praella
A four-country delivery footprint across the US, Europe and India gives Praella coverage suited to Plus merchants releasing outside a single working day. It calls itself a Certified Shopify Platinum Partner, with Chicago and New York offices and teams in Sarajevo, Surat and Athens.
Services include UX and design, development, migration, integrations, CRO and lifecycle revenue optimization, delivered through continuity retainers. Billie Eilish Fragrances and Fenty Beauty are named clients.
7. Domaine Worldwide
Headless development is a named practice at Domaine Worldwide, relevant for Plus merchants wanting a decoupled front end while keeping Shopify as the commerce engine. It describes itself as a Shopify Platinum Partner and states 750+ sites launched and $5B+ in GMV.
Theme development, migrations, integrations, UI/UX and lifecycle marketing round out the offer across a nine-city footprint, with Timex and Arhaus on its site.
8. Uncap
Large-catalog management for distributors and manufacturers is Uncap’s core competence, and catalog scale often pushes a wholesale business onto Plus. Shopify’s directory confirms Platinum status, a partnership dating to May 2013, and a 5.0 out of 5 rating across 65 reviews.
The Chicago firm builds B2C, B2B and POS storefronts, integrates Epicor, Infor and Microsoft Dynamics, and maintains proprietary apps including Uncap Quotes and Uncap Garage.
9. Barrel
Brand and business strategy are delivered alongside the build at Barrel, which helps when a Plus upgrade needs a commercial case, not only a technical one. Its Platinum status is confirmed in Shopify’s directory, and it has been a Plus partner since 2017.
The New York agency covers store builds, CRO, custom apps and integrations, and headless commerce, mainly in CPG, food and drink, health and beauty, and home and garden.
10. Absolute Web
Replatforming and data migration are a core practice at Absolute Web, the phase where Plus programs hold their search visibility or lose it. It describes itself as a Shopify Platinum Partner Agency and reports 26 years in operation.
Based in Miami with Los Angeles and Lisbon offices, it also handles Plus development, B2B ecommerce, UI/UX and CRO. Capezio and Open Farm are named clients.
Buying Plus for the Capabilities You Will Actually Use
An upgrade justified by checkout control and wholesale selling should be delivered by a team that has built both. Some firms above are strong on storefront craft, others on catalog and integration depth, and the answer depends on which feature carries your case.
Ask for a checkout extension or B2B build the agency shipped, not a homepage screenshot. Confirm how multi-store estates are governed, where pricing rules live, and which system is the source of truth for inventory. Establish who supports custom code after launch, and whether the migration plan protects rankings.
Brainvire fits merchants whose Plus case rests on B2B, multi-market selling and ERP-connected operations rather than a visual refresh. For buyers comparing Shopify Plus Development Services against that roadmap, the mix of commerce engineering and enterprise integration earns it a place on a Shopify Plus Partner USA shortlist.