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Shopify Development Agency · USA

The Shopify development agency that builds for revenue

Custom Shopify theme development, Shopify Plus builds, apps, and replatforming, engineered for conversion by a US-based Shopify Plus Partner. Headless Hydrogen when it's actually the right call.

  • Shopify Plus Partner
  • 1.4s median LCP · Core Web Vitals green
  • Pay-on-results growth model
Book a Free Audit CallSee How It Works

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

Google Partner — Premier 2024Meta Marketing PartnerShopify PartnerDash & DotReplenhairAllterOkhaiBanarsaiNOCDASMOKEDropshipwearwell
About Conversion

A US-based Shopify Plus Partner that codes, designs, and grows

  • San Francisco, USA

    In-house team

Conversion is a Shopify Plus development agency headquartered in San Francisco, serving DTC and B2B brands across the US, Canada, UK, and Australia. Our Shopify development services cover custom Liquid themes, Shopify Plus builds with checkout extensibility from our Shopify Plus development team, headless Hydrogen storefronts, and replatforms from Magento, WooCommerce, and BigCommerce. If you are budgeting a build, start with our Shopify website cost guide.

We treat your store as a revenue system. In-house designers, Liquid devs, React engineers, and CRO analysts work in one room, with no subcontracting and no handoffs, and every section ships tied to a conversion hypothesis with a measurable lift target. We've built and scaled Shopify and Shopify Plus stores across 12 verticals, from fast-moving DTC to regulated B2B. After launch the same team can run Shopify SEO and Shopify marketing, so one team is accountable for the revenue number.

Why most Shopify builds fail

A pretty theme isn't a growth strategy

We regularly inherit stalled Shopify projects from freelancers and generalist agencies. The same three problems show up every single time.

  • Theme-led, not conversion-led

    Generic theme installs with hero sliders, parallax effects, and Figma-pretty animations that look great in a portfolio and tank conversion. We start with funnel data, session recordings, and heatmaps, so every section earns its place by lifting a metric.

  • Performance debt baked in

    Bloated apps, render-blocking scripts, hydration loops, and unoptimized Liquid push LCP past 4 seconds and INP into the red. We rebuild on a strict performance budget: sub-1.5s LCP and Core Web Vitals greens by default, on real-world mobile.

  • No experimentation framework

    Stores get launched, then sit. No A/B testing harness, no analytics layer, no CRO roadmap, no retention plan. We ship every build with experimentation, server-side tracking, and a 90-day optimization roadmap already wired up.

Shopify development services

Every part of the Shopify stack, built right

Full-service Shopify and Shopify Plus development, from custom Liquid theme to headless Hydrogen to checkout extensibility, custom apps, and ERP integrations. We work in Liquid, JavaScript, TypeScript, React, Remix, and Next.js, and the artifacts named below are yours to keep, edit, and own.

  • Custom Shopify Theme Development

    Bespoke Shopify themes built from scratch in Liquid, with no customized templates. Sectioned 2.0 architecture, theme app extensions, and modular content blocks your merchandising team can edit without breaking the build. Delivered with a Figma design system and tokens, a component library, and all template designs for mobile and desktop.

    • Liquid + Tailwind / vanilla JS
    • Online Store 2.0 sections everywhere
    • Editor-friendly content blocks
    • Built-in CRO components

  • Shopify Plus Development

    Enterprise-grade Plus builds with checkout extensibility, Shopify Functions, B2B/wholesale, multi-store, and Launchpad automations for high-volume DTC and B2B merchants processing $1M+ GMV.

    • Checkout UI Extensions + Branding API
    • Shopify Functions (discount, delivery, payment, cart)
    • B2B + wholesale catalogs + company accounts
    • Multi-store + multi-currency + Markets Pro

  • Headless Shopify with Hydrogen

    Headless commerce on Hydrogen + Oxygen, or Next.js consuming the Storefront API. For brands that need editorial-grade content, sub-second LCP, complex personalization, or independent frontend deploys.

    • Hydrogen + Oxygen + React Router 7
    • Next.js + Storefront API + ISR
    • Sanity / Contentful / Builder.io integration
    • Edge caching + image CDN

  • Shopify Migration & Replatforming

    Migrations from Magento 1 & 2, WooCommerce, BigCommerce, Salesforce Commerce Cloud (Demandware), Shopware, and custom builds. URL preservation, a full migration and 301 redirect map, and SEO equity protection are non-negotiable.

    • Magento → Shopify Plus
    • WooCommerce → Shopify
    • BigCommerce → Shopify
    • Salesforce Commerce Cloud → Shopify Plus

  • Custom Shopify App Development

    Public and private Shopify apps, plus app and ERP integrations, when off-the-shelf solutions don't fit your business logic. Built on Remix + Polaris with the modern Shopify App Bridge, GraphQL Admin API, and webhook reliability layer.

    • Remix + Polaris + App Bridge
    • GraphQL Admin + Storefront APIs
    • Webhook + bulk operation handling
    • Public app store launch + ASO

  • Performance & Core Web Vitals

    Sub-1.5s LCP, INP under 200ms, CLS at zero. Our Shopify speed optimization work audits, refactors, and rebuilds theme code, app stack, image pipelines, and third-party tag managers until Core Web Vitals are green across the entire catalog on real devices, with a performance baseline and SLA at launch.

    • LCP < 1.5s · INP < 200ms · CLS < 0.05
    • Image CDN + WebP/AVIF + lazy loading
    • Critical CSS + script deferral
    • App audit + Liquid loop optimization

  • B2B & Wholesale on Shopify Plus

    Full B2B implementations on Shopify Plus: company accounts, customer-specific catalogs, volume pricing, net terms, quote requests, draft orders, and gated checkouts. DTC and B2B run on a single store.

    • Company accounts + B2B logins
    • Custom catalogs + volume pricing
    • Net 30 / 60 / 90 + invoice payment
    • Quote-to-order + draft order automation

  • Shopify CRO & Conversion Design

    Conversion rate optimization sprints: landing pages, PDP rebuilds, cart and checkout funnel work, exit-intent flows, and personalization, run as continuous A/B tests with statistically significant lift. Strategy artifacts include a CRO and tech audit deck, conversion hypothesis register, KPI scorecard and benchmark, competitive teardown, and a 12-month optimization roadmap.

    • PDP + collection + cart redesign
    • A/B testing harness (Convert, VWO, GA4)
    • Heatmaps + session replay + form analytics
    • Personalization + segment-based merchandising

  • Tracking, QA & Accessibility

    GA4, GTM, and server-side tracking wired up before launch, pre-launch QA across devices, and a QA and accessibility report (WCAG 2.2).

    • GA4 + GTM + server-side tracking
    • Cross-device QA
    • Accessibility report (WCAG 2.2)
    • Performance verification on real devices

  • Shopify Maintenance & Retainer

    Post-launch retainer for ongoing CRO experiments, performance tuning, app conflicts, seasonal campaign builds (BFCM), version upgrades, and security patching. Handover includes training videos for your team, documentation and runbooks, and a 30 / 60 / 90-day CRO plan. Pay-on-results growth model available.

    • Weekly CRO experiments + reporting
    • BFCM + Q4 launch readiness
    • App stack audits + version upgrades
    • 24/7 monitoring + incident response
Free strategy call

What you get on the first call

A free 30-minute strategy call with a teardown of your current store. One call, one audit, and a clear plan.

Book a Free Strategy Call

  1. Store teardown

    We review your current store and show you the conversion-blocking issues a rebuild would fix.

  2. Revenue lift estimate

    We run a quick model on your traffic and AOV to estimate the revenue lift a rebuild, or a CRO sprint, would unlock.

  3. Architecture recommendation

    Liquid, Hydrogen, or Next.js. We'll tell you which architecture fits before pitching either.

  4. Fixed-scope quote

    A quote within 48 hours, with timelines, scope, and a revenue lift target.

No retainers. No upfront commitment.

Our development process

From audit to launch in 8 to 12 weeks

  1. Step 01

    Audit & strategy

    CRO audit, technical audit, and analytics review. We surface every conversion-blocking bottleneck and set a measurable lift target alongside the deliverables. Output: written strategy doc and roadmap.

  2. Step 02

    Design & architecture

    Wireframes and high-fidelity visual design tied to conversion hypotheses. Theme architecture, component library, content model, and integration map, designed to be edited by your team.

  3. Step 03

    Build & integrate

    Custom Liquid or Hydrogen development, Shopify app and integration work, ERP/PIM/3PL hookups, payment gateways, search, reviews, subscriptions, and pre-launch QA across devices.

  4. Step 04

    Launch & optimize

    Phased launch with real traffic, GSC + GA4 monitoring, performance verification on real devices, then we wire up A/B testing and start the CRO sprint cycle. The store keeps getting better, week over week.

How we compare

Conversion vs the other options on your shortlist

A side-by-side look at what you get from a freelancer, a generalist agency, and Conversion.

  • Shopify Plus Partner status

    Shopify Freelancer
    No
    Generalist Agency
    No
    Conversion
    Yes

  • In-house design + dev + CRO

    Shopify Freelancer
    No
    Generalist Agency
    Often subcontracted
    Conversion
    Yes

  • Headless Hydrogen capability, with Liquid, Hydrogen, or Next.js chosen from your data

    Shopify Freelancer
    No
    Generalist Agency
    Rarely
    Conversion
    Yes

  • Checkout extensibility (Plus)

    Shopify Freelancer
    No
    Generalist Agency
    Limited
    Conversion
    Yes

  • Migration without ranking loss

    Shopify Freelancer
    Risky
    Generalist Agency
    Inconsistent
    Conversion
    Zero ranking loss, every time

  • Core Web Vitals SLA

    Shopify Freelancer
    No
    Generalist Agency
    No
    Conversion
    Yes

  • Conversion lift target on day 1

    Shopify Freelancer
    No
    Generalist Agency
    No
    Conversion
    Yes

  • Pay-on-results growth model

    Shopify Freelancer
    No
    Generalist Agency
    No
    Conversion
    Yes

  • Dedicated US-based team

    Shopify Freelancer
    Sometimes
    Generalist Agency
    Often offshore
    Conversion
    Yes

  • Post-launch CRO retainer

    Shopify Freelancer
    No
    Generalist Agency
    Add-on
    Conversion
    Yes

  • Typical project size

    Shopify Freelancer
    < $5K
    Generalist Agency
    $10K to $50K
    Conversion
    $15K to $250K+

  • Typical launch timeline

    Shopify Freelancer
    Slips often
    Generalist Agency
    12 to 24 weeks
    Conversion
    8 to 20 weeks, on time
Frequently asked

Shopify development questions

What does a Shopify development agency do?
A Shopify development agency designs, builds, and maintains Shopify and Shopify Plus stores end-to-end. That covers custom theme development with Liquid, app and integration work, checkout extensibility on Plus, headless Hydrogen and Next.js builds, B2B and wholesale flows, replatforming from Magento or WooCommerce, and ongoing performance, accessibility, SEO, and CRO work after launch. A senior agency owns strategy, design, engineering, QA, and post-launch growth so the merchant gets one accountable partner.
How much does a Shopify development agency cost in the USA?
In the US market, custom Shopify theme builds typically run $15K to $50K. Shopify Plus builds with checkout extensibility, B2B, custom Functions, and ERP integrations run $50K to $250K+. Conversion scopes most B2B Plus builds in the $50K to $80K range, and a focused replatform or wholesale migration to Shopify Plus typically lands at $40K to $60K depending on catalog size, customer and order history, integrations, and content volume. Headless Hydrogen builds usually start at $80K and scale up with editorial CMS, multi-region routing, and personalization. Conversion offers a pay-on-results option for growth work post-launch: you only pay when revenue grows. Get a fixed-scope quote in 48 hours after a 30-minute discovery call.
How long does it take to build a custom Shopify store?
A focused Shopify theme build runs 6 to 10 weeks. A full Shopify Plus rebuild with custom apps, checkout extensions, B2B catalogs, and ERP integration runs 12 to 20 weeks. Migrations from Magento, WooCommerce, BigCommerce, or Salesforce Commerce Cloud usually run 8 to 14 weeks depending on catalog size, customizations, and content volume. We publish a week-by-week roadmap on day one and run a weekly status call for the duration of the engagement.
What's the difference between Shopify and Shopify Plus?
Shopify Plus is the enterprise tier. It unlocks checkout extensibility (custom checkout via Functions and UI Extensions), Shopify Flow automations, Launchpad for scheduled launches, multi-store management for up to 9 expansion stores, B2B/wholesale catalogs with company accounts, dedicated APIs, higher rate limits, and a dedicated launch manager. If you're processing $1M+ GMV, running B2B alongside DTC, expanding internationally, or need custom checkout logic, you need Plus. Conversion is a Shopify Plus Partner with direct access to launch engineers and early access to Shopify Functions, checkout extensibility, Hydrogen, and Commerce Components releases.
Should I hire a Shopify freelancer or a Shopify development agency?
Freelancers work well for small theme tweaks and sub-$5K projects. For replatforming, Shopify Plus, headless Hydrogen, custom apps, performance optimization, or anything with a launch deadline, agencies have the design, dev, QA, and project management depth to ship on time. We regularly inherit stalled freelancer projects. The hidden cost of a freelancer is rebuilding from scratch six months later.
Can you redesign and rebuild my existing Shopify store?
Yes. Most of our work is redesign and rebuild. We start with a CRO and tech audit, identify the conversion-blocking issues, and rebuild theme architecture, product pages, collection pages, search, and checkout (on Plus) with measurable lift targets. We retain SEO equity through careful URL preservation, 301 redirect mapping, structured data, and 90-day Search Console monitoring after launch.
Do you build headless Shopify storefronts with Hydrogen?
Yes. We build headless Shopify with Hydrogen + Oxygen, or with Next.js consuming the Storefront API. Headless makes sense when you need editorial-grade content, multi-region routing, complex personalization, or sub-1.5s LCP at scale. For most stores under 100K monthly sessions, a well-built Liquid theme outperforms a poorly-built headless setup. We'll tell you which architecture fits before pitching either.
Do you migrate stores from Magento, WooCommerce, or BigCommerce to Shopify?
Yes. We migrate stores to Shopify and Shopify Plus from Magento 1 & 2, WooCommerce, BigCommerce, Salesforce Commerce Cloud (Demandware), Shopware, and custom builds. Every migration includes catalog mapping, customer and order history import, URL preservation with one-to-one 301 redirects, structured data, and post-launch GSC monitoring. Zero ranking loss is the bar, and the metric we report against.
How do I choose a Shopify development agency in the USA?
Look for: Shopify Plus Partner status (verifiable on the Shopify Partner Directory), 5+ years of Shopify-specific work, public case studies with real metrics, in-house design and dev, a written CRO methodology, and Core Web Vitals scores on their own client storefronts. Ask to speak to two clients in your stage of growth. We'll connect you to ours on the first call.
Do you offer Shopify maintenance and support after launch?
Yes. Most of our clients move into a retainer for ongoing CRO experiments, performance optimization, app integrations, and seasonal campaign work (BFCM, Q4, product launches). We handle Shopify version upgrades, theme updates, third-party app conflicts, and security patching. Our pay-on-results growth retainer covers post-launch optimization: you pay a percentage of incremental revenue.
Do you build custom Shopify apps?
Yes. We build private and public Shopify apps using Remix, Polaris, App Bridge, and the GraphQL Admin API. Common builds include ERP/PIM/3PL connectors, custom subscription logic, B2B pricing engines, advanced product configurators, and headless content APIs. We can also publish to the Shopify App Store if you're building a SaaS app on top of the platform.
Will my Shopify store be SEO-friendly?
Every build ships with technical SEO baked in: server-rendered pages, semantic HTML, structured data (Product, FAQ, Article, Breadcrumb), XML sitemaps, optimized canonicals, hreflang for international stores, and Core Web Vitals greens by default. We also offer Shopify SEO and content services as an ongoing engagement through our Shopify SEO Agency service.
Pairs well with Shopify development

One partner for development, marketing, and SEO

Most Conversion clients run all three workstreams with us: fewer handoffs, one P&L, one team accountable for the revenue number.

Book a call

Build a Shopify store that actually converts

Book a free 30-minute strategy call. We'll review your current store, identify the conversion-blocking issues, and show you what a rebuild, or a CRO sprint, would lift in revenue over the next 90 days.

What happens next

  1. 1Pick a time for a 30-minute call.
  2. 2We review your current store and identify the conversion-blocking issues.
  3. 3Get a fixed-scope quote within 48 hours, with timelines, scope, and a revenue lift target.

Prefer email? tarun@conversion.is