Shopify Plus to Medusa: What a 6-Week Migration Actually Costs (and When It Pays Back)

Your CFO runs the numbers every quarter: Shopify Plus transaction fees hit $12,500 monthly at $5M ARR. Add apps ($2,400/mo), Plus subscription ($2,000/mo), and the engineering hours burned working around inventory limits, and you're looking at $200K+ annually just to keep the lights on. Meanwhile, your Head of E-commerce can't ship the subscription bundling logic that would add 15% to AOV because Shopify's checkout API won't bend that way.

The math on a Shopify Plus to Medusa migration is stark: 6-week migration cost versus 18 months of transaction fee savings. For D2C brands doing $5M+ with complex inventory, the payback timeline is predictable enough to budget around. Here's what the migration actually costs, what stays the same, and when the math tips in your favor.

Why D2C Brands Hit the Shopify Plus Ceiling

Shopify Plus works until it doesn't. The breaking point isn't revenue — it's operational complexity. At 1000+ SKUs with variant matrices, subscription logic, and custom fulfillment rules, you start hitting walls that apps can't solve and Shopify Scripts can't reach.

• Transaction fees: 0.25% on all payments adds up to $150K annually at $5M ARR

• Inventory limitations: 100 variant limit per product breaks complex configurators

• Checkout restrictions: Shopify owns the checkout flow — no custom subscription bundling

• App dependency: $2K+ monthly app stack for features that should be native

• Performance ceiling: Liquid templates and app scripts slow page loads to 3.5s+

Medusa eliminates transaction fees entirely, runs on your infrastructure (Postgres + Redis + Node.js), and gives you complete checkout control. The trade-off: you own the hosting, monitoring, and security updates that Shopify handled.

Migration Scope: What Moves, What Rebuilds, What Stays

A Shopify Plus to Medusa migration isn't a lift-and-shift. You're rebuilding the storefront and admin while preserving customer data, order history, and payment processing. The scope breaks into three buckets:

**Direct migration:** Product catalog, customer records, order history, and SEO URLs transfer via API. Shopify's export tools handle most of this, though variant structures need mapping when you exceed Shopify's 100-variant limit.

**Rebuild required:** Storefront (Next.js + Medusa API), admin dashboard, checkout flow, and subscription logic. This is where the engineering hours concentrate — expect 60% of development time here.

**Stays the same:** Stripe/payment processing, email platform (Klaviyo), fulfillment (ShipStation), and customer service tools (Gorgias). These integrate with Medusa the same way they integrated with Shopify.

Week-by-Week Migration Timeline

A 6-week migration timeline assumes a dedicated team (1 senior full-stack, 1 frontend specialist, 1 DevOps engineer) and pre-migration planning. Rushing this timeline usually breaks on integration testing — better to plan 8 weeks and finish early.

1. **Weeks 1-2:** Medusa setup, data export from Shopify, infrastructure provisioning (AWS/GCP + CDN)

2. **Weeks 3-4:** Storefront build (Next.js), product catalog import, payment integration testing

3. **Weeks 5-6:** Checkout rebuild, subscription logic, admin dashboard, DNS cutover preparation

4. **Week 6:** Soft launch with 10% traffic split, monitoring, full cutover after 48-hour validation

// Medusa subscription module that replaces $400/mo Shopify app
// This 40-line module handles what ReCharge charges $400/month for

export class SubscriptionService {
  async createSubscription(customerId: string, productId: string, frequency: number) {
    const subscription = await this.subscriptionRepository.create({
      customer_id: customerId,
      product_id: productId,
      billing_cycle: frequency,
      status: 'active',
      next_billing: this.calculateNextBilling(frequency)
    })
    
    await this.scheduleRecurringOrder(subscription)
    return subscription
  }
  
  async processRecurringOrders() {
    const dueSubscriptions = await this.subscriptionRepository.findDueForBilling()
    
    for (const sub of dueSubscriptions) {
      await this.orderService.create({
        customer_id: sub.customer_id,
        items: [{ product_id: sub.product_id, quantity: 1 }],
        subscription_id: sub.id
      })
    }
  }
}

Hard Costs: Development, Infrastructure, and Contingency

Migration costs break into three categories: development hours, infrastructure setup, and the 20% contingency buffer that separates smooth launches from weekend fire drills.

**Development costs (6-8 weeks):** €45,000-€65,000 for a three-person team. Senior full-stack developer (€800/day × 30 days), frontend specialist (€650/day × 25 days), DevOps engineer (€700/day × 15 days). Add 20% if you need custom fulfillment logic or complex subscription rules.

**Infrastructure setup:** €2,000-€4,000 one-time for AWS/GCP provisioning, CDN configuration, monitoring setup, and security hardening. Monthly hosting runs €800-€1,200 depending on traffic and storage requirements.

**Third-party services:** Stripe processing (2.9% + €0.30), email platform (unchanged), analytics tools (unchanged). The only new cost is error monitoring (Sentry, €50/mo) and uptime monitoring (€30/mo).

**Total migration investment:** €50,000-€75,000 including contingency. Compare this to 4-6 months of Shopify Plus fees (€16,000-€24,000) to see the payback timeline.

Ongoing Cost Comparison: Shopify Plus vs Medusa

The monthly cost structure flips completely after migration. Shopify Plus front-loads features but charges for every transaction. Medusa requires higher technical overhead but eliminates transaction fees entirely.

**Shopify Plus monthly costs at $5M ARR:**

• Shopify Plus subscription: $2,000

• Transaction fees (0.25%): $10,400

• Essential apps (inventory, subscriptions, reviews): $2,400

• Engineering time (workarounds, customizations): $4,000

• **Total: $18,800/month**

**Medusa monthly costs at $5M ARR:**

• AWS hosting + CDN: $1,200

• Monitoring and security tools: $200

• Maintenance and updates: $2,000

• Payment processing (Stripe, unchanged): $12,500

• **Total: $15,900/month**

Monthly savings: $2,900. Annual savings: $34,800. The migration pays for itself in 18-22 months purely on operational cost reduction, before factoring in performance improvements or conversion rate gains.

Revenue Impact During Migration

The 6-week migration timeline includes a soft launch strategy that protects revenue during cutover. You're not flipping a switch — you're gradually shifting traffic while monitoring conversion rates and performance metrics.

**Week 6 soft launch:** Route 10% of traffic to the new Medusa storefront while 90% stays on Shopify Plus. Monitor Core Web Vitals (target: LCP under 1.5s), conversion rates, and checkout completion. If metrics hold steady for 48 hours, increase to 50% traffic split.

**Performance expectations:** Medusa storefronts typically see 40-60% improvement in page load speeds (3.5s → 1.2s LCP) due to static generation and API-first architecture. Conversion rate impact varies: some brands see 8-12% improvement from faster checkout, others see temporary 5-8% dips during user adjustment period.

**Rollback planning:** Keep Shopify Plus active during the first month post-launch. DNS rollback takes 5 minutes if critical issues emerge. Budget for this overlap period — it's insurance against revenue loss during peak seasons.

18-Month Payback Calculation

The migration ROI calculation is straightforward: upfront development cost versus monthly operational savings. At $5M ARR, the math works in 18 months. At $10M ARR, it works in 12 months. Below $3M ARR, the payback extends to 24+ months.

**Year 1 financial impact:**

• Migration cost: -$65,000

• Monthly savings: +$2,900 × 12 = +$34,800

• Net Year 1: -$30,200

**Year 2 financial impact:**

• Monthly savings: +$2,900 × 12 = +$34,800

• Cumulative: +$4,600 (break-even at month 18)

**Year 3+ financial impact:** Pure margin expansion. $34,800 annual savings compound as revenue grows, since Medusa has no transaction fees. At $10M ARR, you're saving $70,000+ annually versus Shopify Plus.

Decision Framework: When Medusa Math Works

The migration decision hinges on three factors: annual revenue, technical complexity, and growth trajectory. The math gets clearer at higher revenue levels, but operational benefits (inventory flexibility, checkout control) matter even at lower volumes.

**Medusa makes sense when:**

• $5M+ ARR: Transaction fee savings justify migration cost within 18 months

• 1000+ SKUs with complex variants: Shopify's 100-variant limit blocks product expansion

• Subscription revenue >30%: Custom subscription logic adds 10-15% to LTV

• International expansion: Multi-currency, tax rules, and localization flexibility

• Technical team in-house: You can handle hosting, monitoring, and security updates

**Stay on Shopify Plus when:**

• Sub-$3M ARR: Payback timeline extends beyond 24 months

• Simple product catalog: Under 500 SKUs with standard variants

• No technical team: Hosting and maintenance costs exceed Shopify Plus fees

• Risk-averse timeline: Can't afford 2-3 weeks of potential conversion rate impact

Considering a Shopify Plus to Medusa migration but need the numbers to work for your specific situation?Send us your migration briefand we'll break down the timeline, costs, and payback calculation for your SKU count and revenue level.

For D2C brands at the Shopify Plus ceiling, we typically recommend a phased approach: migrate the storefront first, validate performance and conversion rates, then rebuild the admin and subscription logic. The 6-week timeline assumes clean data export and standard integrations — add 2-3 weeks if you need custom fulfillment rules or complex tax logic. The math works when transaction fee savings cover development costs, but the operational flexibility often justifies the migration even when the payback extends to 24 months.