Notes

Architektur Dokumentation – Structured Notes

Tue, 05 May 2026 00:00:00 +0000

Architecture Documentation

The Core Problem

Why architecture docs fail:

Problem	Why it happens
Too much too early	Spec written before code — outdated by first sprint
No time during development	Devs skip it under pressure, never catch up
No ownership	Nobody is explicitly responsible → everyone assumes someone else does it
Unclear scope	“What actually goes in there?” — no shared answer

Solution framing: Don’t ask “how do we document everything?” — ask “what and how do we document?” Less is more. Document decisions and context, not implementation details the code already tells you.

Keynote – Structured Notes

Tue, 05 May 2026 00:00:00 +0000

ESDM – Event-Sourced Domain Modeling

Website: https://www.esdm.io/
Core idea: Domain-first modeling language (YAML) that captures DDD, CQRS, and Event Sourcing building blocks in a machine- and human-readable format.

The Core Message

Talk about domain first — technology is secondary.

Common mistake: teams jump to “we’ll use Kafka / PostgreSQL / microservices” before defining what the system actually does. ESDM flips this:

Describe what happens in the domain (events, commands, rules)
Model who triggers what and what results are needed
Only then decide on tech stack

This makes conversations with domain experts productive — they don’t need to understand Kafka to participate.

Observability: Monitoring & Logging – Structured Notes

Tue, 05 May 2026 00:00:00 +0000

Observability: Does My App Work?

Core Principle

Balance: Not too much, not too little. Every metric and log must answer a real operational question.

Monitoring

The Right Amount

Use Icinga (as already deployed in your infrastructure) and focus on:

Where can we take action if something breaks?
Where is the signal-to-noise ratio actually worth it?

Question every metric: If this threshold fires, can we do something about it in 30 seconds? If not, it’s noise.

Workshop – Structured Notes

Tue, 05 May 2026 00:00:00 +0000

Spring, DDD & Architecture Workshop Notes

Spring Security: Upcoming Fixes (May 18)

Rollout date: 18. Mai

Spring releases a batch of security fixes discovered via the Mythos vulnerability check. All branches up to Spring 2.7 are affected.

Blog post with full details drops next week
If you run anything ≤ 2.7, plan the upgrade now
Full talk at DevOps Antwerpen covers this in depth

Domain-Driven Design (DDD)

Extensional vs. Intensional

Term	Meaning	Examples
Extensional	Represents external reality — maps things from outside the domain	DTOs, API models, database rows
Intensional	Expresses domain concepts from within — gives things meaning	Value Objects, Entities, Aggregates

The goal: code that reads like the domain language, not like database schema.