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Greenfield Shopify Plus builds
New brand or new line on Shopify Plus — storefront, theme system, customer accounts, subscriptions where applicable. Performance budget calibrated to Core Web Vitals, not just Lighthouse demoware.
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Enterprise Platforms · ATLAS
Shopify Plus.
Shopify Plus implementation, theme and headless builds, custom apps, B2B catalogs, checkout extensions, and the integration substrate that connects the storefront to the ERP, OMS, and payment systems enterprise commerce actually runs on. Production-grade against Black Friday traffic and finance-grade against the year-end close.
- Practice
- Enterprise Platforms
- Department
- ATLAS
The problem
Most Shopify rebuilds underestimate everything outside the storefront.
The pattern across enterprise Shopify engagements: a beautiful theme that ships in 8 weeks; an ERP integration that’s a cron job nobody owns; a B2B catalog that breaks under multi-currency pricing the moment a German customer logs in; checkout extensions that work in the demo but fail Shopify’s review pipeline; an OMS handoff that drops 4% of orders into a Slack channel marked “maybe”; a finance team that can’t reconcile Shopify Payments to the GL because nobody scoped the chart-of-accounts mapping. Shopify is the easy half; integration, B2B, finance reconciliation, and operations are the half that breaks.
Prosigns ships Shopify Plus as production commerce — not as a theme handover. Storefront and headless decisions made against the actual workload (catalog depth, traffic profile, B2B vs. D2C mix), not against vendor reference architectures. ERP / OMS / payment integration designed before storefront work begins. Checkout extensions reviewed for Shopify Functions limits before the customer signs. Black Friday war-room runbooks written and tested in October, not on the day. The bench in the proposal is the bench at cutover.
Where it ships
6 use cases, in production.
Specific applications we’ve built and operated. Not speculative — every example below is grounded in a real shipped engagement.
- 02
Sub-200ms
p75 product-page TTFB
Headless / composable commerce
Shopify as commerce engine behind a Next.js / Hydrogen / Remix frontend. Storefront API or Admin API as the contract; ISR + on-demand revalidation for catalog freshness without TTFB cost.
- 03
B2B & wholesale on Shopify Plus
Company accounts, customer-specific price lists, NET-30 / PO-based checkout, volume pricing, quote-to-order workflows. Honest scoping where Shopify B2B fits and where a SAP/Salesforce CPQ pairing is needed.
- 04
Replatforming off Magento, BigCommerce, custom
Phased catalog, customer, order, and content migration with documented data-mapping. Cutover with parallel-run, reconciliation, and explicit rollback per workload — no big-bang.
- 05
Custom Shopify apps + checkout extensions
Shopify Functions (discounts, delivery, payments customization), checkout UI extensions, Admin extensions, theme app extensions. App Store-bound or private/enterprise distribution. Reviewed against Shopify’s eligibility before scope is locked.
- 06
ERP / OMS / 3PL / payments integration
NetSuite, SAP, Microsoft Dynamics 365, Acumatica, ShipStation, ShipBob, custom WMS. Documented contracts, retry semantics, idempotent webhooks, and reconciliation harnesses that the finance team trusts.
How we engage
5 phases, named in the SOW.
Each phase has a deliverable, an owner, and an acceptance criterion. Not slogans — operating rules.
- 01
Workload-led architecture
Storefront vs. headless vs. hybrid is decided against catalog depth, B2B mix, content velocity, and team capability — not against a vendor preferred stack. We tell you which fits and document the trade-offs in writing.
- 02
Integration before storefront
ERP, OMS, payment, tax, fraud, and 3PL integrations designed and contracted before storefront UI work begins. Webhooks idempotent, reconciliation jobs in CI, and explicit fallback for partner outages — not a phase 2 afterthought.
- 03
Checkout extensibility scoped honestly
Shopify Functions has limits (execution time, payload size, network access). We scope checkout customizations against those limits before the customer signs, not after rejection. Where Functions don’t fit, we recommend Shop Pay flows or post-purchase patterns explicitly.
- 04
Black Friday-ready operations
Pre-peak load testing against the actual catalog and traffic profile. Runbooks for inventory desync, payment-provider degradation, 3PL outage, theme regression. War-room cadence written in October, rehearsed in November, executed in December.
- 05
Operate or hand off — explicitly
Stay with us under Managed Services for ongoing operations and seasonal readiness, or hand off with 60-day shadowing and complete operational documentation (runbooks, ADRs, alert ownership). Either way, the team that took it live stays through the first quarter.
Capabilities
What’s in scope.
- Shopify Plus storefront, theme system (Online Store 2.0), and Liquid
- Headless commerce on Next.js, Hydrogen, Remix with Storefront API
- B2B on Shopify Plus: company accounts, price lists, PO checkout
- Checkout UI extensions, Shopify Functions (discounts, delivery, payments)
- Custom Shopify apps (public, private, custom-distribution)
- Migrations from Magento, BigCommerce, Salesforce Commerce, custom
- Multi-store, multi-currency, multi-language with Shopify Markets
- Subscriptions (native + Recharge / Bold / Ordergroove integration)
- Performance + Core Web Vitals against Black Friday traffic profile
- Integration with NetSuite, SAP, D365, Acumatica, ShipStation, custom WMS
Stack
Tools we use in production.
- Storefront
- Liquid + OS 2.0Hydrogen + OxygenNext.js + Storefront APIRemix
- Apps + extensions
- Shopify FunctionsCheckout UI extensionsAdmin extensionsTheme app extensionsPolaris
- B2B + payments
- Shopify B2BShopify PaymentsShop PayStripeAdyenPayPalKlarnaAffirm
- Subscriptions + retention
- Shopify SubscriptionsRechargeBoldOrdergrooveKlaviyo
- ERP + OMS + 3PL
- NetSuiteSAPDynamics 365AcumaticaShipStationShipBobCeligoWorkato
- Ops + observability
- DatadogSentryNew RelicCloudflare WorkersShopify Flow
Selected work
Quantified outcomes, not adjectives.
Common questions
Asked before the first call.
- 01
When does Shopify Plus fit, and when does it not?
Plus fits for D2C and B2C up to roughly $500M GMV with catalog depth and complexity that a hosted platform handles cleanly, plus the B2B Plus tier for moderate-complexity wholesale. It stops fitting when you need deep custom checkout flows that Shopify Functions can’t support, or when B2B configurability exceeds Plus B2B (multi-tier approval workflows, deeply custom CPQ). At that point we’ll tell you a custom build or a different platform fits — even if it costs us the engagement.
- 02
Storefront, headless, or hybrid?
Storefront (OS 2.0 + Liquid) wins for content-velocity-led brands where merchandisers ship landing pages weekly. Headless wins for performance-critical commerce, content-platform-led brands (where the CMS is the spine), or where the frontend is shared across mobile / web / kiosk. Hybrid (Hydrogen) splits the difference. We pick against your team capability and roadmap, not against a vendor preference.
- 03
Can you handle ERP / OMS integration?
Yes — that’s most of the engagement on enterprise Shopify. NetSuite, SAP, Dynamics 365, Acumatica are in our active portfolio. Idempotent webhook design, reconciliation jobs that survive a partner-outage backlog, and an explicit chart-of-accounts mapping with finance. We treat integration as primary scope, not phase 2.
- 04
What about B2B and wholesale?
Shopify B2B Plus covers company accounts, customer-specific price lists, NET-30 / PO checkout, and volume pricing. We’ll tell you honestly when it fits and when you need a Salesforce CPQ pairing or a custom quote-to-cash flow alongside Shopify. Both patterns are in our portfolio.
- 05
How do you handle migrations from Magento or other platforms?
Phased, never big-bang. Catalog → customers → orders → content, each migrated and reconciled before the next. Parallel-run during cutover with reconciliation harnesses comparing legacy vs. Shopify outputs. Documented rollback per data domain. Most enterprise migrations land in 4–8 months with no Black Friday risk.
- 06
Will you build Shopify apps for us?
Yes — checkout UI extensions, Shopify Functions, Admin extensions, theme app extensions, and full custom apps (public, private, custom-distribution). Reviewed against Shopify Partners eligibility before the customer signs. Apps that fail App Store review post-build are an SOW gap; we don’t accept them as a billable change order.
- 07
Are you Shopify Plus Partners?
Engagements run with Plus Partner-tier access through partner relationships and direct enterprise contacts. We’ll be explicit on the SOW which work runs through which channel, and which discounts and account credits the customer can claim under Plus partnership.
- 08
What does a Shopify Plus engagement cost?
Discovery + ADR set: 3–5 weeks, $40K–$120K. Storefront-led greenfield Plus build: 3–5 months, $250K–$700K. Headless build with Next.js + Storefront API: 5–8 months, $500K–$1.4M. B2B + ERP integration program: $400K–$1.5M depending on integration count. Migration from Magento or similar: $400K–$1.2M. Managed Services + seasonal readiness: $20K–$120K monthly retainer.
Within Enterprise Platforms
Other capabilities in this practice.
Talk to us
Bring a shopify plus problem. We’ll bring a senior engineer.
A senior engineer plus the ATLAS department lead joins the first call. No discovery gauntlet, no junior reps.