> Markdown version of [/@dennis-doomen](https://www.wearedevelopers.com/@dennis-doomen). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Dennis Doomen .NET software architect, Principal Consultant, and creator of Fluent Assertions. ## About Dennis Doomen builds enterprise solutions on .NET as a software architect and Principal Consultant at Aviva Solutions. He focuses on helping development teams improve their architecture, code quality, and deployment pipelines. He is the creator of Fluent Assertions, an open-source testing library with nearly half a billion downloads. Alongside this, Dennis has maintained a comprehensive set of C# coding guidelines since 2001. In his talks, he breaks down practical techniques for keeping large codebases clean and shares lessons learned from maintaining large-scale open-source tools. ## Past Sessions ### World Congress 2026 Europe 路 July 8, 2026 Berlin, Germany - [Maintainable and Testable Code in the Age of AI](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1458-maintainable-and) 路 120 min - [Practical tips for keeping your C# code base clean](https://www.wearedevelopers.com/videos/100149-practical-tips-for-keeping-your-c-code-base-clean) 路 30 min 路 馃帴 Watch recording ### World Congress 2025 路 July 9, 2025 Berlin, Germany - [What you can learn from an open-source project with 500 million downloads](https://www.wearedevelopers.com/videos/1556-what-you-can-learn-from-an-open-source-project-with-500-million-downloads) 路 30 min 路 馃帴 Watch recording ## Videos - [Practical tips for keeping your C# code base clean](https://www.wearedevelopers.com/videos/100149-practical-tips-for-keeping-your-c-code-base-clean) 路 Dennis Doomen - [What you can learn from an open-source project with 500 million downloads](https://www.wearedevelopers.com/videos/1556-what-you-can-learn-from-an-open-source-project-with-500-million-downloads) 路 Dennis Doomen ## Links - [X](https://twitter.com/ddoomen) - [LinkedIn](https://www.linkedin.com/in/dennisdoomen/) - [Blog](https://www.dennisdoomen.com/)