---
title: "Retiring a CMS under SEO-critical pages"
url: https://www.ruimeira.com/work/decathlon/cms-decommissioning/
canonical: https://www.ruimeira.com/work/decathlon/cms-decommissioning/
author: Rui Costa Meira
updated: 2026-10-01
changelog:
  - { date: 2026-10-01, note: "Drafted from CV; review before publishing" }
---

# Retiring a CMS under SEO-critical pages

> Decommissioning Decathlon's legacy CMS and moving homepage and landing page components to ContentStack without losing organic traffic.

- Period: Nov 2024 – May 2025
- Outcome: 35–40% faster migrated components
- Skills: ContentStack, Technical SEO, Structured data, Amplitude

## Context

The homepage, global navigation, footer and landing pages sat on a legacy CMS. Most of these pages carry organic search traffic, so the migration had to protect rankings while cutting infrastructure cost and technical debt.

## What I did

- Headed the decommissioning plan and the migration to ContentStack.
- Standardised an SEO-ready landing page framework: templates carrying programmatic structured data, alt text and accessibility fixes.
- Coordinated page migrations with the SEO leads.
- Implemented global tracking in Amplitude to compare behaviour before and after.
- Kept decisions, risks and roadmap status documented through delivery.

## Outcome

- Migrated components loaded 35–40% faster on the homepage and in the landing page framework.
- Lower infrastructure cost and less technical debt from retiring the legacy CMS.

## Stack

ContentStack, Amplitude, structured data (schema.org), Search Console.