This book wouldn’t be possible without the HackerOne community. I want to thank HackerOne CEO Mårten Mickos, who reached out to me when I started working on this book, provided relentless feedback and ideas to make the book better, and even paid for the professionally designed cover of the self-published edition.

I also want to thank HackerOne co-founders Michiel Prins and Jobert Abma, who provided suggestions and contributed to some chapters when I was working on the early versions of this book. Jobert provided an in-depth review, editing every chapter to provide feedback and technical insights. His edits boosted my confidence and taught me so much more than I ever realized was possible.

In addition, Adam Bacchus read the book ...

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