Ondřej works as a developer and mentor at Slevomat.cz (largest Czech Groupon-like e-commerce site offering deals to >300k daily visitors.), moving between product and software development. He enjoys quality assurance and frequent deployment of innovations for the end users. He shares his experience at conferences across Europe, offers his expertise as a consultant, and organizes trainings. He also likes pointing out mistakes in other people's code so much that he created PHPStan, a popular static analyzer that focuses on finding bugs in code without running it.