Mountain Warehouse Summits New Digital Peak with Launch of Global Composable E-Commerce Platform

Mountain Warehouse, the UK’s largest outdoor retailer and owner of Eastern Mountain Sports (EMS) in the United States, has officially overhauled its digital backbone. The company announced today the launch of a new "composable" e-commerce store, retiring a custom-built legacy system that had been in operation for decades.

The technical pivot is designed to allow the retailer to scale more aggressively, reduce the "technical debt" associated with aging infrastructure, and accelerate innovation across its sprawling global footprint.

Breaking the "Monolith": Why Composable Matters

For nearly 20 years, Mountain Warehouse relied on a custom-built, monolithic system. While it supported the brand's initial growth, the system had recently become a hurdle. Development teams found themselves spending a disproportionate amount of time on maintenance and security patches rather than developing new features.

By moving to a composable architecture—a modular approach where "best-of-breed" services (like checkout, search, and CMS) are plugged in via APIs—the retailer can now swap or upgrade individual components without rebuilding the entire store.

“Moving away from our legacy platform was critical to unlocking the next phase of Mountain Warehouse’s growth,” said Simon Neale, Chief Technology Officer at Mountain Warehouse. “We now have the flexibility to innovate faster... and focus our engineering efforts on delivering better customer experiences rather than maintaining core infrastructure.”

Fueling Global Ambitions

The upgrade comes at a vital time for the company. Mountain Warehouse currently operates:

• 420+ stores worldwide.

• A customer base exceeding 5 million.

• Active operations in the UK, U.S., Canada, Europe, Australia, and New Zealand.

Because Mountain Warehouse designs and produces the majority of its products in-house, its business model relies on moving high volumes of affordable gear quickly. The legacy platform struggled with the "speed to market" required for global seasonal shifts and limited the company’s ability to experiment with modern features like AI-driven personalization or advanced mobile commerce.

A Stronger Footing in the U.S. Market

The transition is expected to have a significant impact on Eastern Mountain Sports (EMS). Since acquiring the U.S. outdoor staple, Mountain Warehouse has been working to integrate and modernize the brand's digital presence. The new composable system provides a unified tech stack that allows for easier management of the distinct EMS brand identity while utilizing the shared logistical power of the parent company.

The Road Ahead: Faster, Safer, Smarter

In addition to scalability, the company highlighted security as a primary driver for the change. Modern composable platforms offer more robust, distributed security models compared to aging custom systems.

With the new platform now live, Mountain Warehouse intends to lean heavily into "experimental" tech, potentially rolling out enhanced loyalty programs and augmented reality (AR) shopping tools to help customers gauge gear performance before they hit the trails.