After more than 10 years of development, our pet project, Fluent Assertions has almost reached the 250 million downloads. Providing a high quality library like that doesn't come for free. We've been trying to write code that is clean enough for our contributors, write tests that are self-explanatory, ensure breaking changes are strictly controlled and try to make it easy to use. In this talk, I'd like to share the tools and techniques we have been using, how they've enriched our day jobs, and how they may do that for you too. I'll talk about the release strategy, documentation, versioning, naming conventions, code structure, the build pipeline, automated testing, code coverage, API change detection, multi-targeting and more. Check out our new channel: NDC Clips: @ndcclips Check out more of our featured speakers and talks at https://ndcconferences.com/ https://ndcoslo.com/