Large retailers do not modernize in a vacuum. They modernize while stores stay open, fulfillment volumes fluctuate, legacy systems keep running and customers continue to expect the same reliability they have always associated with the brand. That is why the most effective transformation programs are not defined by a dramatic front-end relaunch. They are defined by what customers never have to notice: fewer disruptions, faster improvements, stronger digital experiences and a business that becomes easier to change over time.
Across Publicis Sapient’s work with grocery and retail leaders, a consistent modernization pattern emerges. Carrefour shows what can happen when a heritage grocer unifies fragmented digital assets and accelerates delivery at scale. Loblaw shows the importance of building a digital organization that can keep improving across banners, categories and services. A top global retailer shows how long-horizon transformation can connect e-commerce, supply chain, engineering and store operations over more than a decade. Coppel reinforces a critical point for legacy retailers everywhere: platform modernization works best when it changes how the organization builds and governs digital products, not only what technology it runs.
For executives leading transformation across complex store networks, the lesson is clear. Modernization succeeds when it strengthens the existing business while quietly replacing the constraints that slow it down.
Legacy grocers often have strong assets already in place: trusted brands, loyal shoppers, established store formats and deep operational reach. What holds them back is usually not a lack of ambition. It is fragmentation. Digital assets evolve separately, business units move at different speeds and teams inherit technology that reflects organizational silos more than shopper needs.
Carrefour faced exactly this challenge. Its online footprint had become fragmented, mirroring internal complexity and limiting the impact of change. The transformation effort began by creating a cohesive digital vision and unifying more than 350 separate digital projects into a shared foundation organized around agile squads. That move was more than a governance exercise. It created the conditions for e-commerce growth, faster iteration and a more connected digital business.
The same principle appears in other retail transformations. Loblaw’s roadmap for evolution was grounded in continuous improvement and supported digital offerings across grocery, apparel, beauty and pharmacy. A top global retailer expanded online grocery internationally, built independent digital channels and integrated digital capabilities into existing store and supply chain operations. In each case, the starting point was not adding another isolated tool or storefront. It was aligning assets and teams around a common direction.
For legacy retailers, this is often the highest-value first step. Unification does not mean standardizing every experience into sameness. It means creating the shared architecture, delivery model and operating clarity required to scale what works.
Retail transformation is often described as a platform decision. In practice, it is an operating model decision first.
Carrefour’s progress came from introducing a new scaled delivery model and breaking silos through integrated, diverse agile teams. Instead of coordinating large, infrequent releases across disconnected systems, teams gained the ability to release more often and respond faster to customer needs. The result was a new e-commerce platform in six months, a 1.5x conversion rate since launch and major releases that could happen weekly without downtime.
Loblaw’s journey makes the organizational dimension even more explicit. Its digital organization was built around self-sufficiency, trust and scalability, with speed and innovation shaped by a continuous improvement mindset. That foundation helped the retailer support multiple brands and services, including online grocery pickup and delivery, a digital pharmacy and broader commerce expansion across banners.
Coppel offers a modern version of the same pattern. Replacing a legacy e-commerce platform was important, but the broader shift included embedding multidisciplinary teams, creating governance through an Architecture Review Board, defining new operating rhythms and validating a cross-functional pilot model before scaling it. The impact was not only a better platform, but faster documentation, reduced developer effort, quicker releases and zero disruption at launch.
Executives planning modernization should read this as a warning against narrow replatforming programs. New technology alone rarely creates lasting agility. The retailers that modernize successfully also redesign how decisions are made, how teams are formed and how value is released.
Customers experience omnichannel retail as convenience. Retailers experience it as coordination.
The most successful programs do not treat e-commerce as a separate digital business. They connect digital channels with inventory, order management, fulfillment and stores. That pattern is visible across the portfolio.
Loblaw’s PC Express enabled customers to buy online and pick up in hundreds of locations across multiple banners. Coppel connected more than 4,000 in-store kiosks to its digital commerce experience, helping unify physical and digital shopping. A major sports retailer modernized its order management and fulfillment capabilities to support buy online, pick up in store and faster order processing without downtime during peak demand.
The top global retailer provides the clearest long-view example. Over more than 10 years, transformation extended from online grocery expansion into international markets to supply chain improvements, picking optimization, van scheduling, scan-as-you-go mobile features and re-engineered commerce platforms. Those efforts produced measurable gains, including annual revenue growth across digital businesses, a 35 percent improvement in e-commerce order picking rate and a 4 percent improvement in on-time delivery.
This is one of the most important lessons for large grocers with store networks. Omnichannel excellence is not created only at the point of browse or checkout. It is built in the systems and workflows that determine inventory visibility, picking speed, delivery promises and operational resilience.
For heritage retailers, modernization cannot come at the expense of reliability. Customers may welcome better experiences, but they do not tolerate instability during checkout, peak events or essential shopping moments.
That is why release cadence matters so much. Carrefour moved from infrequent large releases toward continuous, evidence-based incremental transformation, with the ability to deliver enhancements every day without downtime. Coppel launched a modernized platform capable of processing orders immediately after go-live without disruption, while improving holiday readiness, performance and time to market. L’Oréal, in a different consumer context, showed the same principle at scale: customers could continue buying without interruption while commerce launches accelerated from months to weeks and service levels remained at 100 percent.
The message for retail leaders is not simply to move faster. It is to build the engineering, automation and governance capability that makes fast change safe. Brand trust is preserved when modernization happens in the background and customers feel only the benefits: stronger performance, better availability, more accurate delivery promises and more relevant experiences.
Some transformations need six months to prove momentum. Others need years to compound advantage. The most effective retail modernization programs manage both horizons at once.
Carrefour demonstrates the power of a rapid MVP that proves speed at scale is possible. Loblaw shows how a four-year collaboration can change business, culture and customer experience without compromising quality. The top global retailer illustrates what a decade of sustained transformation can look like when digital commerce, supply chain, organizational agility and engineering maturity reinforce one another over time.
This matters because large retailers rarely need a single answer. They need a pathway. That pathway usually starts with a pressing business objective such as e-commerce growth, platform resilience or omnichannel fulfillment. But the longer-term goal is broader: to become an organization that can keep adapting.
For retailers balancing store complexity, legacy technology and high expectations for reliability, a practical pathway emerges from these transformation stories:
The broader takeaway is encouraging. Large grocers do not need to choose between modernization and stability, or between digital progress and brand heritage. With the right operating model, platform strategy and delivery approach, they can modernize without customer disruption and create the capability for continuous change.
That is the real pattern across today’s leading retail transformations: change happens behind the scenes, while trust stays front and center.