Ecommerce Replatforming Plan: 6-Month Roadmap From Audit to Hypercare

10 min read ยท 2026-10-25

An ecommerce replatforming plan is the dated plan for moving your online store from one platform to another without losing orders, search traffic or customer data. It covers six things in order: an audit of what you have, the choice of the new platform, the build and integrations, data migration, SEO redirects, and a tested cutover with a hypercare period after launch.

The template below runs over 26 weeks, which suits a mid-size store with a few integrations such as an ERP, a payment provider and an email tool. It is written for ecommerce managers, digital directors and project managers who have to run the project with an agency or in-house developers and report to leadership. You also get a filled-in example, who owns what, the metrics to watch on launch day, and the traps that make replatforming projects slip past peak season.

The roadmap at a glance

Goal: The new store is live before the agreed date, with all products, customers and open orders migrated, every old URL redirected, integrations working, and conversion back to its pre-launch level within the hypercare period. Duration: 26 weeks

  1. Audit and requirements (Weeks 1-4)

    Know exactly what the current store does so nothing is lost in the move.

    • List every feature in use today: checkout options, promotions, B2B pricing, subscriptions, gift cards, reviews, search and filters.
    • Map every integration: ERP, OMS, payment, tax, shipping, email, CRM, analytics and marketplaces, with the data each one sends and receives.
    • Export a crawl of all live URLs and pull the top landing pages by organic traffic and revenue from your analytics.
    • Record baseline numbers: conversion rate, average order value, site speed and organic sessions by page type.
    • Write requirements as must-have, should-have and later, and get sign-off from ecommerce, marketing, operations and finance.

    Milestone: A signed requirements document, a full integration map, and a baseline report covering conversion, speed and organic traffic.

  2. Platform and partner selection (Weeks 3-8)

    Choose the platform and the build partner that fit the requirements and your team's skills.

    • Shortlist two or three platforms that cover the must-have list.
    • Ask each vendor for a scripted demo of your hardest flows, such as B2B price lists or split shipments.
    • Check total cost of ownership over three years: license, apps or extensions, hosting, agency and internal staff time.
    • Pick an agency or confirm in-house capacity, and agree a statement of work with fixed scope and change control.
    • Set the launch window, keeping clear of peak trading periods.

    Milestone: Platform contract and statement of work signed, with a launch window agreed by the commercial director.

  3. Design and build (Weeks 7-18)

    Build the new store and its integrations against the agreed requirements.

    • Design the key templates first: home, category, product, cart, checkout and account.
    • Build integrations in order of risk, starting with the ERP or OMS and payments.
    • Rebuild only the extensions you still need and drop the ones the audit marked as unused.
    • Run a sprint demo every two weeks with the ecommerce manager and operations lead.
    • Freeze new feature requests at week 14 unless they are must-have.

    Milestone: All must-have features and integrations working on a staging site and accepted in the sprint demo.

  4. Data migration and SEO redirects (Weeks 12-21)

    Move products, customers and orders cleanly and protect search rankings.

    • Clean product data before the move: remove dead SKUs, fix missing images and standardize attributes.
    • Run at least two trial migrations of products, customers and order history, and compare record counts with the old store.
    • Plan for customer passwords, which often cannot be moved between platforms, with an account activation email.
    • Build a 301 redirect map from every old URL to its closest new URL, starting with the top traffic and revenue pages.
    • Carry over page titles, meta descriptions, canonical tags and structured data for products and categories.

    Milestone: A final trial migration with matching record counts, and a redirect map covering every crawled URL, reviewed by the SEO lead.

  5. Testing and launch readiness (Weeks 19-24)

    Prove the store works end to end before real customers use it.

    • Run end-to-end test orders for every payment method, shipping method, tax region and promotion type.
    • Test integrations with real data: orders reach the ERP, stock updates flow back, emails send.
    • Run user acceptance testing with customer service and warehouse staff.
    • Load test for peak traffic and check page speed against the baseline.
    • Write the cutover runbook: content freeze, final data sync, DNS switch, smoke tests, rollback steps and who does what by the hour.

    Milestone: UAT signed off, zero open critical defects, and a cutover runbook rehearsed once on staging.

  6. Cutover and hypercare (Weeks 25-26)

    Switch to the new store safely and fix issues fast in the first weeks.

    • Hold a go or no-go meeting the day before launch with the project sponsor and all leads.
    • Launch at a low-traffic time, run smoke tests, and place a real order on each payment method.
    • Submit the new XML sitemap in Google Search Console and check redirects for the top pages.
    • Hold a daily stand-up for two weeks to triage bugs, track orders and watch conversion.
    • Hand the store over to the business-as-usual team with a list of known issues and owners.

    Milestone: New store live, all test orders reaching the ERP, redirects verified for the top pages, and hypercare exit signed by the ecommerce manager.

Example: a filled-in ecommerce replatforming plan

Picture a home goods retailer selling online in two countries, with about 4,000 SKUs, an ERP for stock and invoicing, and a busy fourth quarter. The current platform is near the end of its support life. Here is how the plan could look month by month.

Notice that launch sits in early autumn. That leaves a few weeks of hypercare before peak season, which is the point of planning backward from the trading calendar.

  • Month 1, Audit: 60 features listed, 11 integrations mapped, 14 unused extensions marked for removal. Owner: ecommerce manager. Milestone: requirements signed.
  • Month 2, Selection: two platforms demoed with B2B price lists, agency chosen. Owner: digital director. Milestone: contract signed and launch window set for September.
  • Months 3-4, Build: templates and ERP integration done first, payment and tax next. Owner: agency project manager. Milestone: staging site accepted.
  • Month 5, Data and SEO: two trial migrations, 9,000 URLs in the redirect map. Owner: SEO lead and data analyst. Milestone: record counts match, redirect map signed off.
  • Month 6, Test and launch: UAT with customer service, cutover on a Tuesday night, two weeks of hypercare. Owner: project manager. Milestone: hypercare exit with conversion back near baseline.

Who owns what

Replatforming touches marketing, operations, finance and customer service, not just the web team. Name an owner for each area at kickoff and put the list in the project charter. A RACI chart works well here: one row per workstream, one column per role.

The project manager owns the plan, not every decision. When a requirement is disputed, the sponsor decides, and the decision goes in the decision log.

  • Project sponsor (commercial or digital director): approves scope, budget and the go or no-go decision.
  • Ecommerce manager: owns requirements, UAT and the business-as-usual handover.
  • Project manager: runs the plan, the risk log, the weekly status report and the cutover runbook.
  • Agency or lead developer: builds the store and integrations and fixes defects.
  • SEO lead: owns the URL crawl, the redirect map and post-launch search checks.
  • Operations and warehouse lead: tests order flow, stock sync and returns.
  • Finance: checks tax, payments, refunds and reconciliation against the ERP.
  • Customer service lead: tests account, order and return flows and prepares answers for customers.

Protecting SEO during the move

Losing organic traffic after a replatform is common and usually avoidable. The main cause is URLs that change without a redirect, so search engines and old links land on a 404 page. Platforms often use different URL structures for products and categories, so assume most URLs will change unless you confirm otherwise.

Start the redirect map early, from a full crawl of the old site plus your analytics and backlink data. Redirect each old URL to its closest match, not to the home page. After launch, crawl the old URL list again and check that each one returns a 301 to a live page. Watch Google Search Console for crawl errors and index coverage changes over the next weeks.

  • Keep page titles, meta descriptions and headings for top pages unless you have a reason to change them.
  • Keep product structured data in place so rich results continue.
  • Redirect old image and PDF URLs that get traffic or links.
  • Update internal links, the XML sitemap and canonical tags to the new URLs.

Metrics to watch at launch

Agree before launch which numbers you will watch and what counts as a problem. Compare each one with the baseline from the audit phase and with the same days of the previous week. A dip on launch day is normal. A dip that lasts more than a few days needs a cause and an owner.

Put these numbers on one shared dashboard and review them at the hypercare stand-up every morning.

  • Orders per hour and conversion rate: from your analytics and the platform's order report.
  • Checkout errors and payment failures: from payment provider logs and error monitoring.
  • Order sync to the ERP or OMS: orders placed against orders received.
  • Organic sessions and 404 errors: from analytics and Google Search Console.
  • Page speed on key templates: against the baseline you set before launch.
  • Customer service contacts: tagged by topic, such as login problems or missing orders.

How to present the plan to leadership

Leadership wants to know three things: when the new store goes live, what could hurt revenue, and how you will know it worked. Put the six phases on one slide as horizontal bars across six months, with a milestone diamond at the end of each. Mark peak season and any code freeze on the same timeline so everyone sees why the launch date matters.

Add a short box with the top three risks and their owners, and a line on success measures: conversion back to baseline within hypercare, no loss of top-page organic traffic, all orders reaching the ERP. Leave out feature lists and integration diagrams. Report weekly with the same slide, each milestone colored green, amber or red.

Risks and dependencies

Most replatforming delays come from outside the web team: an ERP partner who cannot change an interface in time, product data that is messier than expected, or a payment provider that needs weeks to set up a new account. List these at kickoff and review them every week.

Give each risk an owner and a fallback. Be ready to move the launch date rather than launch into peak season with open critical defects.

  • ERP integration delays: owner is the IT lead. Fallback: a temporary file-based order export for the first weeks.
  • Poor product data: owner is the merchandising lead. Fallback: migrate core attributes first and enrich after launch.
  • Payment provider onboarding: owner is finance. Fallback: start the application in the selection phase.
  • Scope creep from new feature requests: owner is the sponsor. Fallback: feature freeze at week 14 and a post-launch backlog.
  • Launch slipping into peak season: owner is the project manager. Fallback: a pre-agreed backup launch date after peak.

Common mistakes to avoid

  • Copying every old feature to the new platform rebuilds old problems, so audit usage first and drop what nobody uses.
  • Leaving redirects until the last week causes traffic loss, so start the redirect map during the build from a full crawl.
  • Running only one trial migration hides data errors, so run at least two and compare record counts each time.
  • Testing with fake orders only misses real failures, so place live test orders on every payment and shipping method before and after launch.
  • Launching close to peak season leaves no time to fix bugs, so plan backward from the trading calendar and keep a backup date.
  • Ending the project on launch day leaves issues without owners, so run two weeks of hypercare with a daily stand-up.

Frequently asked questions

How long does an ecommerce replatforming take?

It depends on the size of the catalog, the number of integrations and how much custom work you need. A small store with few integrations can move in a few months, while larger stores with ERP and B2B needs often take six months or more. Plan backward from your trading calendar.

What should an ecommerce replatforming plan include?

It should include an audit of features and integrations, platform selection, design and build, data migration, an SEO redirect map, testing, a cutover runbook and a hypercare period. Each phase needs an owner, dates and a milestone you can check.

How do you keep SEO rankings when changing ecommerce platforms?

Crawl the old site, map every old URL to its closest new URL with a 301 redirect, and keep titles, meta descriptions and structured data on top pages. After launch, check redirects, submit the new sitemap and watch Google Search Console for errors.

Can customer passwords be migrated to a new platform?

Often they cannot, because platforms store passwords in different ways. Plan an account activation email that asks customers to set a new password, and prepare customer service for login questions in the first weeks.

When is the best time to launch a new ecommerce platform?

Launch in a quiet trading period, with a few weeks of hypercare before any peak season. Pick a low-traffic day and time, and make sure the full team is available for the following week.

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