Technical ConceptsStudy & Reference Repository

42 interconnected articles covering API design, authentication, design principles, concurrency, distributed systems, and cloud operations. All code examples in Java with AWS integrations.

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Learning Paths

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API & Authentication

REST & HTTP, OAuth 2.0 delegated authorization, and AWS enterprise identity with IAM Identity Center.

Start with REST →

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Software Design & SOLID

Hexagonal and Clean Architecture, nine GoF design patterns (Factory Method, Builder, Decorator, Observer, Strategy…), and all five SOLID principles with Java examples.

Explore Patterns →

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Concurrency & Performance

Asynchronous programming with CompletableFuture and virtual threads, plus high-performance streaming with Kinesis and Spark.

Start with Async →

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Distributed Systems & Data

Eventual consistency, Saga pattern, Cassandra, DynamoDB, columnar stores, graph databases, and caching strategies.

Explore Distributed Systems →

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Security

Symmetric and asymmetric cryptography, digital signatures, AWS KMS — and TLS handshakes, cipher suites, mTLS, and certificate management.

Learn Cryptography →

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Learning Paths

Four curated sequences for Scalable APIs, Big Data & Analytics, Writing Quality Code, and Enterprise Identity & Security.

Choose a Path →