Why Modular Monoliths Are Becoming the Preferred Java Architecture for Smaller Teams

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Many software teams that adopted microservices over the past decade are now grappling with the complexity of distributed systems, including multiple network hops, cascading failures, and heavy operational overhead. The modular monolith has re-emerged as a practical alternative, offering the code isolation of microservices while running as a single deployable process with shared transactions. Unlike a loosely organised codebase, a true modular monolith enforces strict boundaries between modules through automated tools like ArchUnit, ensuring cross-module communication only occurs via defined interfaces. Each module maintains its own domain, application, and infrastructure layers, preventing internal implementation details from leaking across boundaries. This architecture is particularly recommended for teams with fewer than 50 engineers who are spending more time troubleshooting inter-service issues than shipping new features.

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