In this episode of Maintainable, Robby speaks with Lutz Hühnken, Head of Engineering Excellence at Upvest, about the transformative power of event-driven architecture in software development. Lutz brings his extensive experience to the table, discussing how breaking down complex systems into manageable modules and leveraging event-driven design can lead to more resilient and maintainable software.

• [00:05:32] Introduction to Well-Maintained Software: Lutz shares his thoughts on the key characteristics of maintainable software, emphasizing modularity and simplicity.
• [00:10:24] Challenges with "Magic" in Code: The pitfalls of relying too much on frameworks and ORMs, including examples from Lutz’s experience with Hibernate.
• [00:11:16] Understanding Event-Driven Architecture: Lutz explains the fundamentals of event-driven architecture and its advantages over traditional command-driven approaches.
• [00:13:50] The Role of Promises in Event-Driven Systems: How clear design-time responsibilities ensure reliability in event-driven communication.
• [00:15:43] Choreography vs. Orchestration: The debate between these two approaches to managing workflows and why Lutz favors choreography for most systems.
• [00:17:57] Onboarding Developers in Event-Driven Systems: Tips for effectively integrating new team members into an event-driven architecture.
• [00:26:52] The Role of Engineering Excellence at Upvest: Lutz discusses his new role and the importance of systems thinking in guiding architectural decisions.
• [00:34:55] Managing Technical Debt: Lutz offers insights into balancing feature development with addressing technical debt, emphasizing the importance of a healthy investment distribution.

• Breaking down large systems into smaller modules with clear boundaries can significantly enhance maintainability.
• Event-driven architecture offers a powerful way to decouple system components, making them more resilient and scalable.
• Developers should be cautious of "magic" in code, such as heavy reliance on ORMs, which can obscure underlying complexities and hinder maintainability.
• Choreography often provides a more scalable and maintainable approach than orchestration in managing complex workflows.
• Technical debt should be managed proactively, with regular investments in refactoring and productivity enhancements to maintain long-term software health.

• Lutz Hühnken's Blog
• Event-Driven Architecture by Martin Fowler
• The Open Society and Its Enemies by Karl Popper
• Event-Driven Architecture Reading List

• LinkedIn
• Mastodon
• Bluesky

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