Rebuilding Vodafone's Online Shop for Zero-Downtime Releases

The Challenge

Vodafone needed a modern digital shopfront that could handle peak sales traffic, including the high-demand Christmas season, with zero downtime. The existing platform could not support the release velocity or reliability required for a competitive telecommunications market. Every production release carried the risk of downtime, making the team hesitant to ship changes and slowing the pace of iteration on the customer experience.

With multiple vendors and legacy APIs, the project demanded collaboration at scale and the ability to handle traffic spikes during critical sales periods. The Digital First programme brought together over 100 people across multiple vendor organisations, each with their own delivery practices and tooling. Aligning this group around a shared cadence and shared standards was as significant a challenge as the technical architecture itself. Any outage during the Christmas shopping season would directly impact revenue and customer trust at the busiest time of the year.

The Approach

Kablamo partnered with Vodafone (now TPG) to lead the delivery of their new online shop as part of the Digital First programme, transforming the customer experience. The programme represented a wholesale rethink of how Vodafone's digital channels operated, replacing the existing online shop with a modern, cloud-native platform built for speed and reliability. Working within the multi-vendor, 100+ person team, Kablamo embedded agile best practices and enabled Vodafone to confidently release multiple times per day for the first time in its history.

The engineering team focused on four key areas. First, building a scalable, serverless architecture in AWS that could absorb peak sales traffic without manual intervention. The serverless approach meant the platform would scale automatically in response to demand, removing the need for capacity planning and pre-provisioning that had constrained the previous system. Second, embedding agile ceremonies to drive collaboration across the multiple vendors involved in the programme, establishing shared rituals such as cross-team stand-ups, sprint reviews, and retrospectives that kept the large team aligned on priorities and progress. Third, implementing developer experience improvements that shortened the feedback loop and made delivery faster and more reliable, including automated CI/CD pipelines for continuous deployment that gave engineers confidence in every release. Fourth, creating an integration layer to unify the various APIs that powered the shop, enriching system responses and providing a consistent interface for the Next.js frontend.

Using AWS, Next.js, and the serverless architecture, the team delivered a platform designed for resilience under load. The architecture ensured that individual component failures would not cascade into site-wide outages, and auto-scaling handled traffic increases without manual capacity planning. The platform was built to support a "big-bang" launch where the old shop would be replaced entirely, rather than a gradual migration, which raised the stakes for the team to deliver a stable product from day one. Extensive load testing validated that the platform could handle the anticipated Christmas traffic peaks before the cutover. The team simulated peak traffic scenarios to ensure that every component in the stack, from the Next.js frontend through the integration layer to the underlying APIs, could sustain high concurrent load without degradation.

The Results

The project culminated in a successful big-bang launch with no downtime and no priority issues identified, a first for Vodafone. The new platform enabled Vodafone to release multiple times daily, ensuring agility and reliability during critical sales spikes. The platform handled the Christmas sales season without incident, validating the architectural decisions made during development.

The shift from infrequent, high-risk releases to multiple daily deployments changed how the digital team operated, allowing product changes to reach customers within hours rather than weeks. The integration layer that unified the legacy APIs proved particularly valuable, providing a stable abstraction that allowed backend systems to be updated independently without breaking the customer-facing shop. The CI/CD pipelines established during the programme gave engineers confidence that each release was safe, removing the anxiety that had previously slowed delivery velocity.

Looking Forward

Agile practices embedded by Kablamo continue to deliver value across the business today. The shared ceremonies and delivery practices established during the programme became the standard operating model for Vodafone's digital teams, improving cross-vendor collaboration well beyond the initial project scope. Teams that had previously worked in isolation adopted the shared rituals and communication patterns introduced during the programme, creating a more cohesive engineering culture across the organisation.

The platform's scalable, serverless architecture ensures Vodafone can continue to grow and adapt to changing customer demands without the downtime risks that previously accompanied every release. The ability to deploy multiple times per day, proven during the critical Christmas launch period, remains a core capability of the digital team. The zero-downtime release capability that was a first for Vodafone has become the expected standard for all subsequent platform work. Vodafone has since merged with TPG Telecom, and the engineering practices established during this programme continue to inform the combined entity's digital operations.