I recently was asked what I would do differently if I had the experience I have now. This got me thinking about the mistakes I've made, the traps I fell for and the dogmatism I became part of over the last 27 years of professional software developer in the Microsoft realm. In this talk, I'll be going down memory lane with you and share everything I've learned on architecture, tools, technologies, agile software development, maintainable code, automated testing, documentation and anything else that I think you should know. Prepare yourself for a full hour of stories, both good and bad.