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5 essential guides on software design — SOLID principles, all 23 Gang of Four patterns, the 12-Factor methodology, microservice architecture and infrastructure-as-code with Terraform.

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Principles & Patterns 2 guides

The foundational rules that make code maintainable — SOLID principles every developer must internalize, and all 23 Gang of Four patterns with real Java examples.

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Architecture & Cloud 3 guides

System-level thinking — how to build cloud-native apps with 12-Factor, decompose systems into microservice tiers, and manage infrastructure with Terraform.

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195+ Java guides — Collections, Streams, Concurrency, Spring and more.

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