Global retailer accelerates Spring Boot migrations at massive scale
By the numbers
01 · The challenge
A global retailer operating thousands of Spring-based services across its e-commerce, checkout, inventory, and supply chain platforms faced a mounting modernization risk. Over time, teams had adopted a wide range of Spring Boot versions, from legacy 1.3 releases to early 3.x deployments, creating fragmentation that slowed upgrades and increased operational risk.
With peak retail periods approaching, the organization needed a way to modernize thousands of repositories quickly and safely, without pulling engineers away from customer-facing work or relying on brittle, manual migrations. Coordinating upgrades repo by repo would have required weeks per team and introduced unacceptable risk during high-traffic windows.
02 · The solution
The retailer partnered with Moderne to automate and orchestrate Spring Boot migrations at enterprise scale. Rather than centralizing changes through a single team, Moderne enabled developers to execute upgrades within their existing workflows while ensuring consistency and safety across the entire codebase.
Using automated refactoring recipes, the platform engineering team coordinated Spring Boot 3 migrations across thousands of repositories in parallel. Moderne also supported custom modernization patterns for internal libraries, letting teams apply organization-specific standards without manual intervention, and establishing a repeatable process for both urgent security updates and long-term framework evolution.
03 · The results
The retailer modernized its Spring ecosystem ahead of critical retail periods, significantly reducing risk while accelerating delivery. Thousands of repositories were upgraded in parallel, moving teams to Spring Boot 3.x and Java 17 without weeks of manual coordination.
The organization not only completed a major framework transition but also established a scalable foundation for future upgrades, including preparation for upcoming Spring Boot 4 releases. What had once been a high-risk, time-consuming effort became a repeatable, automated process embedded into the development lifecycle.
See deterministic, estate-wide code change on your own repositories.