Ecommerce Migration to AWS: A Technical Leader’s Guide

How to move to the cloud without disrupting sales

For ecommerce companies, pressure to improve digital experiences, absorb unpredictable demand, and launch new capabilities faster is exposing the limits of legacy infrastructure that wasn't built for the way the businesses now operate and sell. 

The stakes are high in ecommerce where workloads need 24/7 availability as customers continue to browse and buy while the platform exchanges data with payment providers, inventory systems, fulfillment operations, and other services. 

This guide focuses on migrating a self-hosted, custom, or multi-tenant ecommerce application and its supporting infrastructure to AWS (not replacing the commerce platform with another SaaS product). The objective is to move the existing environment, modernize where the business case supports it, and preserve transaction integrity throughout the transition.

A successful AWS cloud migration starts by defining the complete environment, its dependencies, and the business conditions the new architecture must support.
 

Key takeaways
 

• The full ecommerce environment extends beyond the storefront to include its data layer, platform services, security controls, and critical business integrations.
   
• Transaction continuity depends on clear ownership of customer, cart, order, payment, and inventory data throughout every migration phase.
   
• Platform capacity is determined by the entire transaction path. Scaling the web tier will not resolve constraints in databases, search, application code, or third-party services.
   
• Business validation must confirm that customers can complete purchases and that orders reach downstream operations correctly; infrastructure health alone cannot provide that assurance.
   
• An assessment with cloud business case turns a broad cloud mandate into a plan for architecture, sequencing, cost, risk reduction, modernization, and available AWS funding.
   

What an ecommerce migration to AWS includes

Ecommerce infrastructure extends well beyond the storefront. The application depends on several technical layers, and each layer may require a different migration or modernization path.

• Application and compute: The storefront, administrative tools, background workers, scheduled jobs, and APIs that run the platform.
   
• Commerce data: Customer records, catalog data, pricing, carts, orders, and the databases or storage systems that maintain them.
   
• Platform services: Search, caching, queues, media storage, monitoring, identity, and deployment systems.
   
• Business integrations: Payment, tax, fraud, ERP, inventory, fulfillment, marketplace, and customer-service connections.
   
• Delivery and security: DNS, content delivery, certificates, network controls, secrets, logging, and compliance boundaries.

Some companies will move these components largely as they exist today. Others will replatform selected services or redesign parts of the application during migration. Defining the scope early prevents the project from becoming either a server relocation with no plan for dependencies or an open-ended modernization program with no achievable cutover.

The scope should also distinguish infrastructure migration from platform replacement. Moving a custom commerce application to AWS requires different data mapping, application change, testing, and organizational decisions than switching to another ecommerce product. Running both projects together increases cutover complexity because the infrastructure and the commerce platform are changing at the same time.
 

Protect transaction continuity throughout the migration

Most ecommerce platforms distribute transaction state across several systems. The application may own the cart, a payment provider owns authorization state, an ERP holds inventory, and an order-management system drives fulfillment. Planning the migration server by server can obscure those relationships.

Map the transaction lifecycle before choosing migration groups or cutover methods. The purpose is to identify where business state changes, which system owns it, and what must remain consistent while old and new environments operate in parallel.
 

Establish data ownership and synchronization

Parallel environments reduce risk only when each type of data has an authoritative source. Allowing both environments to accept uncontrolled writes can split customer changes, inventory reservations, orders, and payment status across two systems.

Assign ownership for each major transaction stage during every migration phase:

• Shopping state: Determine where sessions and carts are stored while traffic shifts between environments.
   
• Merchandising data: Keep catalog, price, promotion, and search data aligned with its source.
   
• Order state: Define when an order becomes authoritative and how payment status remains attached to it.
   
• Operational handoff: Reconcile the data passed to inventory, fulfillment, and customer-service systems.

Choose replication and reconciliation methods based on the application architecture. A platform that can route tenants independently may migrate in controlled groups, while a tightly coupled application may require a coordinated data cutover.
 

Test the business path along with the infrastructure

Technical validation confirms that instances, databases, and network connections are healthy. Business validation confirms that the platform still produces the correct commercial outcome.

Test representative purchases from discovery through fulfillment. Include the payment methods, promotion logic, inventory behavior, and downstream handoffs that materially affect revenue or operations. Validate failure paths as well as successful ones, particularly retries, payment declines, inventory changes, and delayed responses from external services.

Use reconciliation reports to compare orders, payments, and inventory across the cutover boundary. This gives the migration team a direct way to detect missing or duplicated transactions before customers or operational teams encounter them.
 

Build rollback around new transactions

Routing traffic back to the former environment does not, by itself, restore the business to its previous state. Orders placed after cutover, payment authorizations, inventory adjustments, queued events, and customer changes may now exist only in the AWS environment.

Define rollback criteria before cutover, including who can stop the migration and how the team will reconcile new transactions. Plan the technical window around the company's commercial and operational calendar, then reserve enough time for business validation before committing fully to the new environment.

Our article on common mistakes when migrating to the cloud covers the broader planning, cost, security, and stakeholder issues that apply across industries.
 

Design the target AWS environment for ecommerce demand

Cloud migration creates an opportunity to address accumulated capacity constraints while improving the platform’s resilience, security, and ability to support future releases. Design the target environment around transaction patterns and business requirements rather than average server utilization.
 

Design and test for peak demand

Different commercial events stress different parts of an ecommerce platform. A product launch may increase browsing and media delivery, while a promotion can place greater pressure on checkout, inventory, and payment services.

Build a demand model that connects customer activity with request volume, completed transactions, database activity, and critical downstream calls. Set appropriate headroom above the expected peak and identify which components take the longest to scale.

Autoscaling can add application capacity, but it cannot correct inefficient queries, database connection limits, poor cache design, or a saturated search service. External providers may impose their own rate limits regardless of how much AWS compute is available.

Load testing should reproduce realistic customer behavior across the complete transaction path. Test beyond the forecast peak, introduce degraded dependencies, and repeat the exercise after material application or infrastructure changes.
 

Preserve payment security and PCI boundaries

Migration can change PCI scope by altering how payment data enters the environment, which systems can access it, or how workloads are segmented and logged. Review that scope while designing the target architecture rather than treating compliance as a post-migration check.

Verify certificates, secrets, network rules, callbacks, webhooks, and allowlisted addresses for every payment method. Confirm that retries are idempotent so a repeated request cannot create a duplicate authorization, capture, or order. Protect customer and payment data from exposure in logs and monitoring tools.
 

Protect performance, SEO, and measurement

Content delivery and caching can improve storefront performance while reducing demand on the origin. Configure cache behavior around the application so customers do not receive stale prices, promotions, or availability.

Include DNS, redirects, canonical tags, robots directives, structured data, analytics, and consent tools in cutover testing. A routing or header change can affect acquisition and measurement even when the storefront remains available.
 

Choose a migration approach that fits the platform

The right migration method depends on the business deadline, the application's architecture, and the amount of change the team can safely absorb.
 

Rehost first or modernize selectively

Rehosting may be the appropriate first step when a data center deadline or infrastructure risk creates urgency. It moves the platform onto AWS without combining the migration with a large application redesign.

Targeted modernization can still make sense when it removes a clear constraint. A managed database may improve recovery and reduce administration, while queues or containers may address scaling and deployment problems. Tie each change to a measurable benefit instead of using migration as a reason to rebuild every component.

The broader choices among rehosting, replatforming, rearchitecting, retaining, replacing, and retiring workloads are covered in Cloud Migration and Modernization: A Strategy Playbook for Executives.
 

Migrate multi-tenant platforms in controlled groups

A platform serving many merchants may be able to treat each tenant or storefront as a migration unit. This approach limits the effect of an individual problem and provides evidence from production traffic before the next group moves.

Web Shop Manager used this model when moving its multi-tenant platform, which supports approximately 500 automotive-parts ecommerce sites. AWS Application Migration Service and AWS Database Migration Service kept the on-premises and AWS environments synchronized as customers moved in stages.

Stratus10 also created parameterized AWS CloudFormation templates and automated individual-customer migrations. After modernization, Web Shop Manager could provision new sites in minutes rather than days or weeks. The Web Shop Manager ecommerce migration shows how tenant isolation, reusable infrastructure, and consistent configuration can turn a complex platform migration into a repeatable process.
 

Build the ecommerce migration business case

A technical migration plan explains how the platform can move. The business case determines whether the proposed architecture, timing, and investment make sense for the company.

Connect the project to three forms of value:

• Avoided costs: Replace an upcoming hardware refresh, data center commitment, or growing maintenance burden.
• Reduced risk: Improve recovery, remove unsupported systems, and address capacity constraints that threaten revenue.
• New capability: Accelerate releases and create a stronger foundation for new channels, analytics, automation, or AI.

Include the cost of migration in the comparison. Application remediation, data transfer, temporary parallel environments, load testing, security work, and post-cutover operations can materially affect the investment.

Stratus10 offers a free, in-depth AWS migration assessment to complete this analysis before an ecommerce company commits to the larger project. It combines technical discovery with a right-sized AWS cost model, migration roadmap, risk findings, and modernization priorities. The result is an executive- and board-ready business case grounded in the company's actual platform, transaction demands, and financial priorities.
 

Use AWS funding to move qualified projects forward

The AWS Migration Acceleration Program provides methodology, technical support, and financial investment across its Assess, Mobilize, and Migrate and Modernize phases.

Stratus10 works with customers and AWS to establish qualification early, build the project around set requirements, and secure the available funding. Approval and processing may take weeks, so starting the free AWS migration assessment program early is highly recommended.
 

Ecommerce cloud solutions after the migration and who runs them

Migration resolves the immediate infrastructure problem, but the target environment also needs a clear operating model. Assign ownership for availability, deployments, backup validation, security, cost management, capacity testing, and incident response before the migration team steps away.

Continue modernization where it produces a clear operational or commercial return. Managed services, containers, serverless functions, decoupled processing, or changes to the data tier may improve resilience and delivery speed after the initial migration risk has passed. Our guide to modernizing applications from VMs to containers or serverless examines those tradeoffs.

Establish the AWS account and governance model at the same time. Ecommerce and FinTech company Zebit had production, development, and internal workloads sharing one AWS account. Stratus10 implemented a governed AWS Control Tower environment with six accounts, improving workload separation, access management, and support for PCI DSS responsibilities.

The operating model may remain internal, use a co-managed structure, or include an AWS managed services provider. Make that decision before handoff so the controls and procedures built during migration continue after launch.
 

Build your migration plan around your business

An ecommerce migration needs to preserve transaction integrity, support expected demand, and produce a stronger operating foundation without taking on unnecessary application change.

Begin with a free AWS migration assessment to develop a board-ready business case and migration roadmap built around your platform’s dependencies, revenue-continuity requirements, and available AWS funding.