Multi-part series that take a topic from first principles to a working, tested implementation. Read in order, or jump to the chapter you need.
Design a Kotlin internal DSL that compiles BPMN collaborations into an immutable AST, validates them, emits BPMN 2.0 semantic XML plus BPMN DI layout, and renders in standards-compatible viewers — with the buyer process deployable to Flowable.
Build an enterprise operations agent with Java 25, Spring Boot 4.1, Spring AI 2.0, Kotlin MCP tools, RAG, OAuth, evals, and observability.
Measure, diagnose, and improve a Spring Boot order API with Gatling, Prometheus, Grafana, and PostgreSQL — one controlled experiment at a time.
A practitioner's field guide to the patterns behind real microservices systems — decomposition, data ownership, messaging, resilience, and delivery — built one working Kotlin service at a time, with honest trade-offs at every step.
Build user search over 300 million PostgreSQL profiles with Elasticsearch 9 and Spring Boot 4 in Kotlin: mappings, queries, sync, sizing, and operations.
Build jfp, a small dependency-free functional library for Java 21 — Option, Result, Validated, functors, monads, and monoids — with the laws that make each abstraction trustworthy, tested against a running government-scheme eligibility example.
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