The Modular Monolith 2026 Complete Guide — Spring Modulith, ArchUnit Fitness Functions, and Lessons from Shopify's 30TB/

The biggest architectural inflection point of 2026 is the "microservices regression" phenomenon. According to the CNCF Q1 2026 report , 42% of organizations that initially adopted microservices have consolidated some services into larger deployable units — and that consolidated form is the Modular Monolith . This architecture keeps the operational simplicity of a single deployable unit while explicitly enforcing domain boundaries, and it recently drew attention after Shopify processed a peak of