Intermediate5 min read
Design Patterns for Java Backends
The GoF patterns as Spring actually implements them, the ones worth writing yourself, and modern Java alternatives using records, sealed types and pattern matching.
Read tutorialEnterprise Backend · Phase 6
Enterprise Patterns & System Design
The senior-engineer layer: GoF patterns as Spring actually uses them, CQRS and event sourcing, DDD in practice, transaction semantics, API security, gRPC, sharding and enterprise integration patterns.
Advanced6 min read
CQRS & Event Sourcing
Separating reads from writes: CQRS without event sourcing, event stores and aggregate replay, building projections, snapshots, and an honest account of when not to use either.
Read tutorialAdvanced6 min read
Domain-Driven Design in Practice
DDD applied rather than described: choosing aggregate boundaries, value objects that enforce invariants, repositories, hexagonal architecture, and running an event storming session.
Read tutorialIntermediate6 min read
Transaction Management Deep Dive
Transactions beyond the annotation: every propagation mode and when it applies, isolation levels and the anomalies they prevent, transaction-bound events, and why XA lost to sagas.
Read tutorialAdvanced6 min read
API Security & the OWASP API Top 10
The API-specific vulnerability classes and their Spring fixes: broken object-level authorization, mass assignment, unrestricted consumption, SSRF, and API inventory management.
Read tutorialAdvanced6 min read
gRPC in Java Microservices
gRPC for internal service calls: Protocol Buffers and schema evolution, the four RPC types, deadlines and interceptors, Spring Boot integration, and an honest comparison with REST.
Read tutorialAdvanced6 min read
Database Sharding & Scaling Strategies
Scaling past one database: read replicas and routing, choosing a shard key you will not regret, hash versus range sharding, cross-shard queries, and migrating without downtime.
Read tutorialAdvanced5 min read
Enterprise Integration Patterns
The vocabulary of system integration: routers, splitters, aggregators, content enrichers and the claim check, implemented with Apache Camel and Spring Integration.
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