System Replatform
The Shopify Replatforming Partner for Brands That Can’t Afford a Bad Migration
$3.14B+ in GMV migrated to Shopify. 24 consecutive migrations with zero data loss.
For enterprise and growth-stage brands moving off Magento, Salesforce Commerce Cloud, WooCommerce, or a custom build. We’ve been doing this for Eighteen years, and we’ll tell you what’s hard about your specific situation before you sign anything.
Replatforms don’t fail on the platform. They fail on the parts that don’t get demoed.
The checklists all say the same reassuring things: audit your data, plan your redirects, test thoroughly. Those are tasks. What actually decides the outcome is a handful of decisions made in the first three weeks — and a set of conversations most partners avoid until it’s too late to have them cheaply.
Below is what we see go wrong. It’s informed by 10,000+ hours of collective effort and $3.14B+ in GMV migrated to Shopify to date.
Execution risk
Data you assumed was fine
Duplicate SKUs, orphaned variants, malformed customer records, orders referencing products that no longer exist. In 17 years, product data has rarely been as clean as described. Finding it in week two is a schedule problem; finding it in week ten is a crisis. The buybuy Baby migration moved 30,000+ SKUs and 8.3 million customer records off Oracle ATG in 31 days, which is only possible when the data is understood before the clock starts.
Subscription contracts
On a subscription business this is the single highest-risk element of the project. Lapsed billing events and customers who churn at cutover don’t get recovered later. They get recovered by acquisition spend. → Subscription & Retention Experiences
The long tail of URLs
SEO equity survives a comprehensive redirect map. It does not survive a spot-check of your top 50 pages. The traffic you lose is the traffic nobody was watching, and for a multi-market brand the tail is longer still. → Market Expansion
The three weeks after launch
The agency celebrates, the team rolls off, and the merchant is alone with a new platform and a list of edge cases nobody caught. We scope through the eighteen months after launch, because that’s where the return on the project shows up. → Enterprise Shopify Development
Organizational risk
Internal alignment is thinner than leadership thinks
Leadership is asking can Shopify actually meet our needs? Your development team is asking how does this change affect my role? A technically flawless build still fails if the merchandising team doesn’t trust it and routes around it. → Technology Adoption & Change Strategy
An oversimplified roadmap and no architecture behind it
The assumption that a replatform doesn’t need architecture, planning, or thought leadership is what turns a clean rollout into bolt-ons, rework, and fragile integrations — and the organization misses its one chance to set Shopify up as a scalable foundation rather than a lateral move.
Technology partners selected too late
Every partner — an ERP, a 3PL, a PIM, a subscription platform — brings its own data model, integration method, latency tolerance, and authentication standard. Choose them late and you discover those requirements after your Shopify architecture is already built around different assumptions. That’s a rework problem, not a vendor problem.
Experience
18+
Years of Unlocking Growth
Scale
$3.14B+
in GMV Migrated to Shopify
Partnership
1 of 5
Founding NA Shopify Platinum Partners
Precision
94.7%
Implementation Predictability
Clients
8
Unicorns & Counting
24 consecutive enterprise migrations with zero data loss and maintained SEO rankings.
Six principles we’ll argue with you about
These are opinions rather than best practices, and several of them run against standard advice.
Your real fear is cost and timeline. Hold us to it.
Every brand walking into a replatform is carrying the same two anxieties: this will cost more than we’ve been told, and it will take longer than anyone is promising. We have done this enough times to have it down to a science — 24 consecutive migrations, zero data loss, SEO rankings maintained — and we put our reputation on the line for every one. Discovery produces a scoped plan with the remediation work included rather than discovered in week ten, and if something changes, you’ll hear it from us early rather than in a change order. One team, your goals, shared accountability for the number and the date.
Take every upgrade the platform hands you. Defer the ones you have to invent.
“Migrate to parity” is bad advice — it spends your entire budget rebuilding what you already had and lands you on a modern platform running a legacy system. But stacking four bets on one launch is worse. Anything Shopify gives you natively, take it now. Anything that requires net-new invention, defer it to the roadmap — which usually means not bundling your redesign into your replatform. If a redesign is genuinely load-bearing, we scope it separately under eCommerce Funnel Engineering or Visual Design.
Treat the replatform as your one chance to consolidate the stack
Every commerce system accumulates applications, custom patchworks, and expensive depreciating in-house tools that a market solution now does better. The replatform is the only moment you will have budget and organizational permission to kill that sprawl. We run a full stack analysis at the start: what consolidates, what gets replaced by something off the shelf, what’s genuinely load-bearing and stays. Mack Weldon’s re-architecture on native Shopify capabilities collapsed 3,000 products to 300 and removed CMS overhead entirely. Gaia Herbs unified four separate properties into one platform. Neither was available as a standalone project — both happened because a platform change created the opening. → Technology Stack
Architect for the three-year roadmap, not today’s requirements
The most expensive replatform is the one you do again in three years because nobody asked where the business was going. We want the roadmap conversation before the architecture conversation — international expansion, new channels, subscription model changes, B2B, retail. Those plans change the target architecture materially, and they cost almost nothing to design for up front.
Business continuity is an engineering requirement with acceptance criteria
Most continuity plans are a slide. Ours is a list of things that must be verifiably true at cutover, each one owned and testable. If the plan has no rollback strategy, it isn’t a continuity plan — it’s optimism with a launch date. See the commitments below.
Choose the partner for the hard parts, not the pretty parts
A homepage is the easiest thing in a replatform to evaluate and the least predictive of how it goes. What decides the outcome is data remediation, subscription contract migration, ERP integration, redirect methodology, and what happens in month four, and none of that shows up in a portfolio. The questions we’d want asked are further down this page.
The work that decides the outcome
These are the parts of the work that decide the outcome, so here’s how we handle each one.
Data migration & remediation
Full catalog, customer, and order-history audit at project start. Defined migration phases, documented cut-over protocols, and cleanup scoped as real work rather than absorbed silently mid-sprint.
Subscription contract migration
Contracts moved without lapsed billing or churn, across Recharge, Ordergroove, and StayAI. Where payment-token migration requires it, we engage Shopify Professional Services directly rather than improvising around the constraint.
ERP, OMS & WMS integration
Your back-office systems get integrated, not replaced. Point-to-point where the application supports it; a designed middleware layer where an ERP, CRM, or PIM requires one. Where a custom OMS or shipping calculator has to survive, it survives. → Integrations
SEO continuity
Complete URL inventory, full redirect map, structured data rebuilt, and analytics continuity so that comparing pre-launch to post-launch is actually possible.
Checkout & cutover
Shopify’s native checkout, Shopify Functions where custom logic is genuinely required, and a rehearsed cutover with a tested rollback path defined before launch day.
Enablement & documentation
Training, documentation, demo sessions, and a defined post-launch support window. Your team owns the system when we’re done, not a dependency on us.
What “business continuity” means when we say it
| Commitment | Acceptance criterion |
|---|---|
| Order history and customer accounts | Intact and accessible post-cutover |
| Subscription contracts | Migrated with zero lapsed billing events |
| Inventory | Accurate at cutover |
| Fulfillment | Uninterrupted |
| SEO equity | Every indexed URL mapped — not a top-50 spot check |
| Analytics | Continuous, so pre- and post-launch are comparable |
| Rollback | A tested path back, defined before cutover |
94.7% implementation predictability exists because continuity is scoped as engineering work with acceptance criteria.
How a replatform actually runs
Business case & discovery
Weeks 1–4
Data audit, integration inventory, three-year roadmap conversation, target architecture, stack consolidation decisions, internal alignment.
Design
Weeks 3–8, only where in scope
Only where a design change is deliberately in scope. Otherwise deferred per Principle 2.
Implementation
Weeks 4–12
Build, integrate, migrate, test.
Cutover & launch
—
Rehearsed cutover with the rollback path live.
Post-launch
Ongoing
Defect burn-down, performance validation under real traffic, and the improvements deferred at kickoff actually getting built.
- Business requirements documentation. A solution vision that identifies the technology gaps and how they get bridged, presented to your stakeholders.
- System architecture mapping. Data flows, integration points, customer journey touchpoints, and legacy dependencies — documented before scoping, not discovered during implementation.
- Functional proof of concept. We convert the technology concerns your team can’t get past into solvable problems through hands-on prototyping.
- Change management. Org chart impact analysis, a transparent model for organizational change, and a communication timeline established before the project kicks off.
Timelines: buybuy Baby launched in 31 days. Dorel Juvenile moved four brands in about 90 days. Trade Coffee took four months. Follett had a live proof-of-concept store around 60 days after kickoff, ahead of the wider program. Most enterprise replatforms we run land at three months or fewer. We scope after auditing your data and integrations rather than before.
Where you’re coming from
Magento / Adobe Commerce
EAV-model catalog structures that don’t map cleanly onto anything, which makes this the highest data-remediation load of any source platform. Dorel Juvenile moved four brands off legacy and Magento-based sites — with years of SEO authority and backlinks at stake across all four — onto one shared Shopify codebase in about 90 days.
Oracle ATG and legacy enterprise platforms
The buybuy Baby case: 30,000+ SKUs and 8.3 million customer records migrated to Shopify Plus in 31 days, with 14 integration points live at launch, following an acquisition out of Chapter 11 with $1.5B in projected sales at risk.
Custom monoliths
Trade Coffee ran a Solidus platform built from scratch, 80% custom code. The migration moved 5,000+ SKUs, hundreds of thousands of subscribers, and over a million customer records in four months — and rebuilt the AI taste-profile engine on Ordergroove and Shopify without losing functionality.
Custom subscription platforms
Grove Collaborative had spent a decade building a subscription platform that became a financial and operational burden shortly after going public. A two-month discovery produced a full Business Requirements Document, and a working proof of concept in two sprints answered whether Shopify and Ordergroove could handle the complexity.
Headless architectures
Thesis moved from a fragile headless storefront to Shopify with no gap in brand experience, preserving their signature Product Quiz, then reached a 212% conversion lift over four years. Good Ranchers exited a NextJS and Node.js headless stack to Shopify Horizon in eight weeks, cutting total cost of ownership 45%. → Composable Commerce
Fragmented multi-site estates
Follett operated 1,200+ campus stores on a legacy stack with data silos across locations. Gaia Herbs ran four distinct properties across two platforms. In both cases the replatform was also a consolidation, designed for the full portfolio from the first sprint.
Anatta’s Agentic Operating System
Every replatform runs on one system.
Senior architects paired with an agentic framework that absorbs the commodity execution — so the table-stakes half of a migration stops setting the pace of your roadmap. You aren’t paying a team to learn your business. You’re paying for the decisions.
See how we workMigrations we’ve run
buybuy Baby
30,000+ SKUs and 8.3M customer records off Oracle ATG in 31 days
Explore the buybuy Baby success storyFollett
1,200+ campus stores, and enterprise retail’s hardest requirements proven on Shopify in under three sprints
Explore the Follett success storyTrade Coffee
A custom Solidus monolith replaced in four months, AI subscription engine intact
Explore the Trade Coffee success storyDorel Juvenile
Four brands, one foundation, ~90 days, and no second migration when strategy changed
Explore the Dorel Juvenile success storyGrove Collaborative
A decade of custom subscription logic moved to Shopify, development time cut 200%
Explore the Grove Collaborative success storyThesis
Off a fragile headless architecture with no gap in brand experience — and a 212% conversion lift
Explore the Thesis success storyAnatta’s omnichannel platform experience, combined with Shopify, let us rethink the transformation playbook entirely.
Amit MalhotraCTO, buybuy BABY
Anatta addressed all of our challenges in a practical way.
Chris ClarkCo-Founder & CDO, Grove Collaborative
Ten questions to ask any replatforming partner
Ask us these. Ask everyone else these. Compare the answers.
- Show me a migration at my complexity, with numbers attached.
- Tell me about a migration that went sideways and what you did about it.
- Who specifically is on my team, and how senior are they? Not who’s in this pitch — who’s in the standup.
- What’s your rollback plan?
- When do you audit my data: before scoping, or during migration?
- How do you handle subscription contract migration specifically?
- What’s your redirect methodology — full URL inventory, or top pages?
- What happens in month four after launch?
- What in my current stack would you recommend killing, and why?
- What do you think is hard about my situation? Be specific.
Ten Questions to Ask Any Replatforming Partner
One page. No gating theater — name, email, and it’s yours.
Frequently asked questions
How long does replatforming to Shopify take?
It depends on catalog complexity, integration count, and subscription logic. Most enterprise replatforms we run complete in three months or fewer, because our process runs phases in parallel rather than in sequence. buybuy Baby migrated 30,000+ SKUs and 8.3 million customer records off Oracle ATG in 31 days. Dorel Juvenile moved four brands off legacy and Magento platforms in about 90 days. Trade Coffee took four months to move a custom Solidus monolith with an AI subscription engine intact. Follett had a live proof-of-concept store roughly 60 days after kickoff. We won’t give you a timeline before auditing your data and your integrations.
Should I redesign my site during a replatform?
Usually not at the same time. A replatform and a redesign are each hard projects with their own risk profile, and running them together means that when a metric moves after launch you won’t know which project caused it. Take the platform upgrades Shopify hands you natively, migrate cleanly, then redesign against real post-launch data. Where a design change is genuinely load-bearing to the business case, we scope it in deliberately — but that’s a decision, not a default.
What’s the biggest risk in a replatform?
Your data, and then the three weeks after launch. Data problems discovered late don’t stay data problems; they become schedule and budget problems. The post-launch window is where most of the cost of a bad replatform actually lands.
Will I lose SEO rankings when I replatform?
Not if the redirect work is done properly — a complete inventory of every indexed URL and a mapped redirect for each, not a spot-check of your top pages. We also rebuild structured data and preserve analytics continuity so you can actually measure pre- versus post-launch. Ranking loss after a migration is almost always a methodology failure, not an inevitability.
Is Shopify a downgrade from Magento or Salesforce Commerce Cloud?
It’s a different trade. You give up some raw configurability and you get release velocity, a materially lower total cost of ownership, native checkout that converts, and an ecosystem that keeps shipping. The useful question isn’t feature-for-feature parity — it’s what your team actually uses versus what it nominally has access to. That audit usually finds a much smaller gap than expected.
What does a replatform of this scale typically cost?
It’s a function of three things: catalog complexity, integration count, and subscription logic. We run the architecture audit before quoting, so the figure includes the remediation work that estimates made earlier tend to leave out and then discover in week ten.
Aren’t senior-led teams more expensive?
More per hour. Less per outcome. The cost in an enterprise replatform isn’t hourly rate, it’s rework, delay, and decisions that take three weeks to make because nobody in the room has authority. We staff senior, keep teams small, and give you direct access to the people writing the code. That’s how 94.7% implementation predictability happens.
Tell us what’s hard about your situation.
