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Shopify Plus Agency · USA

The Shopify Plus agency for brands that outgrew their stack

A full-service Shopify Plus ecommerce agency: checkout extensibility, Shopify Functions, B2B + DTC from one instance, Magento migrations, and ERP integration. Not on Plus yet? We'll tell you honestly whether you need it.

  • Shopify Plus Partner · direct line to launch engineers
  • Checkout extensibility + Shopify Functions shipped in production
  • Pay-on-results growth model after launch

Trusted by 50+ D2C brands · Google, Meta & Shopify partners

Google Partner — Premier 2024Meta Marketing PartnerShopify PartnerDash & DotReplenhairAllterOkhaiBanarsaiNOCDASMOKEDropshipwearwell
About our Plus practice

A Shopify Plus ecommerce agency that ships the hard parts

  • San Francisco, USA

    In-house team

Conversion is a full-service Shopify Plus ecommerce agency headquartered in San Francisco. We're a Shopify Plus Partner, building enterprise storefronts for DTC and B2B brands across the US, Canada, UK, and Australia. Our Shopify Plus development team covers checkout extensibility, Shopify Functions, and multi-store international expansion. We build Shopify B2B and wholesale catalogs on the same instance as DTC, and run migrations to Shopify Plus from Magento, Salesforce Commerce Cloud, and WooCommerce.

Plenty of agencies sell 'Shopify Plus services' and have never shipped a Checkout UI Extension or a delivery-customization Function. We build the parts of Plus that justify its price tag: the checkout, the automation layer, and the B2B engine. Every build ships with an experimentation harness and a 90-day optimization roadmap. If you're still weighing the upgrade, our Shopify Plus pricing guide breaks down platform fees and build costs, and a Shopify Plus consultant can advise before you commit to a build. We also build headless Shopify Plus on Hydrogen, recommended only when a theme build can't deliver the experience.

Why Plus projects stall

Most agencies sell Plus. Few can build it.

We regularly inherit stalled Plus projects. The failure patterns are consistent, and avoidable.

  • Plus features left on the shelf

    Brands pay for Plus and use it like standard Shopify: no checkout extensibility, no Functions, no Flow automations, no B2B catalogs. You're paying an enterprise license for a theme install. We build the features that justify the tier.

  • Checkout treated as untouchable

    The checkout is where money is won or lost, and most agencies won't touch it. Checkout UI Extensions, Branding API, and Functions let us add upsells, trust content, custom fields, and bespoke discount logic, measured with A/B tests.

  • B2B bolted on with apps

    Wholesale run through duct-taped apps and duplicate stores creates catalog drift and support chaos. Plus-native B2B (company accounts, price lists, net terms, quote-to-order) runs both channels from one instance with one source of truth.

What clients say

There's a reason why people rave about us

Real recommendations from founders, managers, and teammates our founder has worked with over 12+ years in performance marketing.

Client
Tarun is a brilliant professional. If you want to invest in online advertising, you can trust his work with your eyes closed. He has done an amazing and high quality job on our ad accounts. It has been a pleasure to work with and learn from him.
Jessica Torres
Jessica Torres
CRM & Sales Ops Specialist, EVEO
Reported to Tarun
I rarely come across real talents who stand out like Tarun. I had the pleasure of working with Tarun for three years at GroupM, collaborating on several project teams. Tarun's ability to handle multiple projects was unlike any I've seen before and made a dramatic increase in the productivity level of our company. No matter how tense a meeting, Tarun made sure everyone left with a smile. As a team member or a leader, Tarun earns my highest recommendation.
Arnav Girdhar
Arnav Girdhar
Digital Head, Miduty · Ex-GroupM
Same team
Tarun is simply amazing at social media marketing. He single-handedly managed big accounts and gave amazing insights due to which he was able to earn appreciation from his clients.
Gargi Bannerjee
Gargi Bannerjee
Ex-WPP · IPG
Same team
Tarun has the best domain knowledge and is a true professional. I am glad we got connected. I highly recommend him.
Sarvam Bansal
Sarvam Bansal
Founder & MD, Olevea · IIT
Same team
Tarun lives and dies with Facebook and Twitter. He thinks in a different way than other strategists I know and that makes him a special professional. The kind of results he has given to his clients is simply awesome and unbelievable. I would say that he can easily compete with people with 6-7 years of experience in his domain and expertise.
Vikash Kumar
Vikash Kumar
B2B Cybersecurity Content Writer
Managed Tarun
Tarun is one of the smartest guys I know — because he works harder than anyone else, makes smart decisions, and is willing to take calculated risks from his forward-thinking mindset. I would recommend hiring Tarun for your business if you want it to reach the level of success you are striving for. His psychological knowledge & expertise from a business point of view drives the brand forward!
Shruti Mathur
Shruti Mathur
Digital Marketing Professional · Google & HubSpot Certified
Same team
Tarun is an expert at driving the strategic visions and tactical execution of online marketing campaigns that drive demand for the business. Analytic and adept at collecting intelligence on channel effectiveness and other key metrics. Identifies marketplace trends and recommends strategy changes to improve conversions. Experienced in all leading market platforms.
Raksha Gupta
Raksha Gupta
Group Head, Publicis Global Delivery · Ex-Sprinklr
Worked together
Tarun was extremely helpful during the testing of one of our new social media tools here at Buffer. His deep knowledge of social ads best practices helped us nail down how we should approach this product. He proved just how much he knows about social media and I'm looking forward to working with him again.
Roy Opata Olende
Roy Opata Olende
UXR & Research Ops Leader · Zapier, The Browser Company
Same team
I've known Tarun for a number of years and if there's one thing I know about him it's that once he sets his mind on something, he goes after it and keeps going until it gets done. Keep it up!
Chitresh Gupta
Chitresh Gupta
Senior UX Designer, Thales Group
Shopify Plus development services

Everything the Plus tier can do, put to work

Full-service Shopify Plus development, from checkout extensibility to B2B to multi-store international expansion. We work in Liquid, TypeScript, React, Remix, and the full Plus API surface.

  • Checkout Extensibility

    Custom checkout built on Checkout UI Extensions, the Branding API, and Shopify Functions. Upsells, trust content, custom fields, address validation, and delivery logic inside Shopify's checkout.

    • Checkout UI Extensions
    • Branding API design systems
    • Post-purchase extensions
    • A/B tested checkout upsells
  • Shopify Functions

    Custom backend logic without apps: discount stacking rules, delivery and payment customization, cart validation, and B2B pricing engines, deployed as Functions with full CI/CD.

    • Discount + promotion logic
    • Delivery customization
    • Payment customization
    • Cart + checkout validation
  • B2B & Wholesale on Plus

    Plus-native B2B: company accounts, customer-specific catalogs and price lists, quantity rules, net-terms payment, and quote-to-order workflows, running DTC and B2B from a single instance.

    • Company accounts + locations
    • Price lists + quantity rules
    • Net terms + payment terms
    • Quote-to-order workflows
  • Multi-Store & International

    Expansion stores, Markets Pro, multi-currency, localized checkout, hreflang, and geo-routing. One brand, many markets, without catalog drift or SEO cannibalization.

    • Up to 9 expansion stores
    • Markets Pro + multi-currency
    • hreflang + geo-routing
    • Localized content + checkout
  • Migrations to Shopify Plus

    Replatforming from Magento 1 & 2, Salesforce Commerce Cloud, WooCommerce, BigCommerce, and Shopware. Catalog, customer, and order history migration with zero-ranking-loss SEO preservation.

    • Magento to Plus
    • SFCC (Demandware) to Plus
    • One-to-one 301 mapping
    • 90-day GSC monitoring
  • ERP, PIM & 3PL Integration

    NetSuite, SAP, Microsoft Dynamics, Akeneo, Salsify, ShipBob, and custom middleware. Real-time inventory, order sync, and financial reporting that survives an audit.

    • NetSuite + SAP + Dynamics
    • PIM (Akeneo, Salsify)
    • 3PL + WMS integration
    • Custom middleware (Node/TypeScript)
  • Flow & Launchpad Automation

    Shopify Flow automations for fraud, tagging, inventory, and VIP workflows. Launchpad for scheduled drops, flash sales, and BFCM, tested and rehearsed before the traffic spike.

    • Flow automation library
    • Launchpad drop scheduling
    • Fraud + risk workflows
    • BFCM load rehearsal
  • Headless Shopify Plus (Hydrogen)

    Hydrogen and Oxygen storefronts for brands that need fully custom front ends, content-heavy experiences, or composable commerce with Commerce Components. Recommended only when a theme build can't deliver it.

    • Hydrogen + Oxygen builds
    • Headless CMS integration
    • Commerce Components
    • Theme vs headless TCO review
  • Subscriptions, POS & Omnichannel

    Subscription commerce, Shopify POS for retail, and unified inventory across DTC, wholesale, marketplaces, and stores, so every channel sells from one catalog.

    • Subscription programs
    • Shopify POS rollout
    • Marketplace + retail sync
    • ADA / WCAG accessibility
  • Performance & CRO on Plus

    Core Web Vitals engineering at the theme level, experimentation harness setup, and a post-launch CRO roadmap run by our Shopify CRO team.

    • Core Web Vitals greens
    • A/B testing harness
    • Post-launch CRO roadmap
    • Pay-on-results growth option
Free Plus audit

What you get in the free audit

A free 30-minute call with the engineers who'd build your store, not a salesperson.

  1. The Plus capabilities you're not using

    Which Plus capabilities you're paying for and not using, and what each is worth in revenue.

  2. Plus modeled against your current plan

    Whether Plus pays for itself at your GMV. If standard Shopify is the better call, we'll say so.

  3. Your migration path mapped

    For Magento or SFCC replatforms, we map your catalog, integrations, and SEO risk on the call.

  4. A fixed-scope quote within 48 hours

    A fixed-price quote with a week-by-week roadmap, before you sign anything.

Our Plus delivery process

From scoping to launch in 12 to 20 weeks

  1. Step 01

    Discovery & fixed-scope quote

    30-minute discovery call, technical audit of your current stack, and a fixed-scope quote within 48 hours. You get a week-by-week roadmap before you sign anything.

  2. Step 02

    Architecture & design

    Data model, integration map, checkout extension plan, and conversion-led design. Every template is tied to a conversion hypothesis with a measurable lift target.

  3. Step 03

    Build & integrate

    Theme or headless build, Functions and checkout extensions, B2B configuration, ERP/PIM hookups, and migration dry runs, with weekly status calls and a shared sprint board.

  4. Step 04

    Launch & compound

    Zero-downtime cutover, 301 verification, 90-day Search Console monitoring, and a post-launch CRO program. Most clients move to pay-on-results growth from here.

Shopify vs Shopify Plus

Shopify vs Shopify Plus: is the upgrade worth it?

Shopify Plus starts at $2,300/month (3-year term) or $2,500/month (1-year term). Here's what that buys you over standard Shopify. Full numbers are in our Shopify Plus pricing guide.

  • Platform fee

    Shopify (Advanced)
    $399/mo
    Shopify Plus
    From $2,300/mo
  • Checkout extensibility (UI Extensions, Branding API)

    Shopify (Advanced)
    Limited
    Shopify Plus
    Yes
  • Shopify Functions (custom discounts, delivery, payments)

    Shopify (Advanced)
    Public apps only
    Shopify Plus
    Custom Functions
  • Native B2B (company accounts, price lists, net terms)

    Shopify (Advanced)
    No
    Shopify Plus
    Yes
  • Expansion stores

    Shopify (Advanced)
    No
    Shopify Plus
    Up to 9
  • Flow + Launchpad automation

    Shopify (Advanced)
    Flow only
    Shopify Plus
    Yes
  • API rate limits

    Shopify (Advanced)
    Standard
    Shopify Plus
    Higher
  • Best fit

    Shopify (Advanced)
    Under ~$1M GMV
    Shopify Plus
    $1M+ GMV, B2B, or international
Why Conversion

The Plus partner brands switch to

  • Shopify Plus Partner

    Direct access to Shopify's launch engineers, early access to Functions, checkout extensibility, and Commerce Components. Your build benefits from the roadmap before it ships publicly.

  • We build the hard parts

    Checkout UI Extensions, Shopify Functions, B2B engines, ERP middleware. These are the features that justify the Plus license, and we ship them in production.

  • Fixed scope, week-by-week roadmap

    A fixed-price quote within 48 hours of discovery, a published week-by-week roadmap on day one, and a weekly status call for the duration. No hourly-billing black holes.

  • Zero-loss migrations

    Every replatform ships with one-to-one 301 mapping, structured data preservation, and 90-day Search Console monitoring. Zero ranking loss is the bar and the metric we report against.

  • Conversion-led builds

    Every template ships tied to a conversion hypothesis. In-house designers, Liquid devs, React engineers, and CRO analysts in one room, with no subcontracting.

  • Pay-on-results after launch

    Post-launch growth work runs on our pay-on-results model: fees track incremental revenue instead of a flat retainer.

Frequently asked

Shopify Plus agency questions

What is Shopify Plus?
Shopify Plus is Shopify's enterprise plan for high-volume brands. On top of standard Shopify, it adds checkout extensibility, Shopify Functions, Shopify Flow and Launchpad automation, native B2B with company accounts, up to 9 expansion stores, higher API rate limits, and dedicated merchant success. Brands like Gymshark, Allbirds, and Kylie Cosmetics run on Plus.
How much does Shopify Plus cost per month?
Shopify Plus starts at $2,300/month on a 3-year term or $2,500/month on a 1-year term. Once you pass roughly $800K in monthly sales, it switches to a variable fee based on revenue. That is the platform fee only. Agency build costs are separate, and our Shopify Plus pricing guide breaks down both.
Shopify vs Shopify Plus: what's the difference, and is the upgrade worth it?
Standard Shopify covers most stores. Shopify Plus adds a customizable checkout, Shopify Functions, Flow and Launchpad, native B2B company accounts, up to 9 expansion stores, and higher API limits. Plus makes financial sense once you're around $1M+ in annual sales, running B2B alongside DTC, expanding internationally, or need custom checkout logic. Below that, a well-built standard Shopify store usually delivers better ROI, and we'll tell you that on the first call if it's true for you.
What is a Shopify Plus agency?
A Shopify Plus agency is a development and growth partner that specializes in Shopify's enterprise tier. Beyond standard theme work, a Plus agency builds checkout extensibility (Checkout UI Extensions and the Branding API), Shopify Functions for custom discount, delivery, and payment logic, B2B and wholesale catalogs with company accounts, multi-store and multi-currency expansion with Markets Pro, Launchpad automations, and ERP/PIM/3PL integrations. Conversion is a Shopify Plus Partner with direct access to Shopify's launch engineers. Plus partner status reflects enterprise experience and does not mean an exclusive client list: we also build on standard Shopify, and many brands start there and move to Plus as they grow.
How much does a Shopify Plus development company charge?
In the US market, Shopify Plus builds typically run $50K to $250K+ depending on scope: checkout extensibility, custom Functions, B2B catalogs, number of expansion stores, and ERP/PIM integrations are the main cost drivers. A focused Plus theme rebuild starts around $30K to $50K. Migrations to Plus from Magento or Salesforce Commerce Cloud typically run $40K to $120K. We scope fixed-price after a 30-minute discovery call and deliver a quote within 48 hours.
What's the difference between Shopify Plus, Premier, and Platinum partners?
Shopify's Partner Directory ranks agencies in tiers: Select, Plus, Premier, and Platinum. Tiers reflect the volume and complexity of merchant work an agency has delivered, not how good a fit it is for you. Check the tier in the official Shopify Partner Directory, then judge the agency on shipped Plus work (checkout extensions, Functions, B2B) at your revenue stage.
How do I choose between Shopify Plus agencies?
Verify Shopify Plus Partner status in the official Shopify Partner Directory, not on the agency's own website. Ask to see a Checkout UI Extension, a custom Shopify Function, and a B2B catalog they built in production, because many 'Plus agencies' have never shipped any of them. Ask who will build your store and whether they're in-house, and speak to two current clients at your GMV stage, ideally with a similar migration path. Agree on project, retainer, or performance-based pricing upfront and get a fixed-scope quote before any work starts. Red flags: guaranteed rankings or revenue, long lock-in contracts with no exit clause, vague hourly billing, no written SEO migration plan, and pressure to sign fast.
Can you migrate us to Shopify Plus from Magento, Salesforce Commerce Cloud, or WooCommerce, and how long does it take?
Yes. We migrate stores to Shopify and Shopify Plus from Magento 1 & 2, Salesforce Commerce Cloud (Demandware), WooCommerce, BigCommerce, Shopware, and custom builds. Every Plus migration includes catalog and customer/order history mapping, one-to-one 301 redirects, structured data preservation, ERP re-integration, and 90 days of post-launch Search Console monitoring. Most Shopify Plus builds and migrations take 12 to 20 weeks from discovery to launch. A focused theme rebuild can ship in 8 to 10 weeks, and a Magento or Salesforce Commerce Cloud replatform with ERP integration and B2B usually needs the full 16 to 20 weeks. You get a week-by-week roadmap with your fixed-scope quote.
Do I need headless or Hydrogen on Shopify Plus?
Usually not. Most Plus brands get better speed-to-value from a well-engineered Online Store 2.0 theme plus checkout extensibility. Headless with Hydrogen makes sense when you need fully custom front-end experiences, content-heavy storefronts, or multiple front ends on one backend. We build both and will recommend the cheaper option when it fits.
Do you build B2B and wholesale on Shopify Plus?
Yes. B2B on Plus is one of our core practices: company accounts, customer-specific catalogs and price lists, quantity rules, net-terms payment, quote-to-order workflows, and B2B checkout customization via Functions. Most engagements run DTC and B2B from a single Plus instance so you get one stack, one catalog, and one reporting layer.
What is checkout extensibility and why does it matter?
Checkout extensibility is Shopify Plus's framework for customizing checkout with Checkout UI Extensions, the Branding API, and Shopify Functions, replacing the deprecated checkout.liquid. It lets you add trust badges, upsells, custom fields, address validation, and custom discount or shipping logic inside the checkout without forking it. Checkout customizations typically lift checkout completion 5 to 15% when driven by A/B test data.
Retainer vs project vs pay-on-results: how do Shopify Plus agencies charge, and do you support stores after launch?
Shopify Plus agencies usually price in one of three ways. Project fees cover fixed-scope builds and migrations. Monthly retainers cover ongoing development and CRO. Performance-based fees are tied to revenue lift. We do fixed-price projects for builds. After launch, most Plus clients move into growth work covering CRO experiments, performance optimization, seasonal readiness (BFCM, Q4), Functions and app maintenance, and new-market expansion. Our pay-on-results option ties those fees to the incremental revenue we drive, so you pay as the store grows.
Book a call

Put the Plus in your Shopify Plus

Book a free 30-minute scoping call with the engineers who'd build your store. We'll audit your current Plus setup or migration path and identify the unused capabilities worth the most revenue.

What happens next

  1. 1Pick a time for a 30-minute scoping call.
  2. 2Bring your current Plus setup or migration path: platform, catalog, and integrations.
  3. 3Get a fixed-scope quote within 48 hours, with a week-by-week roadmap.

Prefer email? tarun@conversion.is