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Sławomir Kołodziej is a Senior Frontend Engineer with extensive experience in web application development, specializing in React. At 15Five since May 2021, Sławomir has progressed through various roles from Frontend Engineer to Senior Frontend Engineer II. Prior experience includes serving as a Senior Frontend Engineer at Netguru from November 2017 to April 2021, where responsibilities encompassed leading developer teams, conducting estimation and planning sessions, and creating training courses on testing React applications. Sławomir also worked as a Bootcamp Mentor at Kodilla, teaching aspiring web developers HTML, CSS, and JavaScript, and previously as a Frontend Engineer at Sas Design Interactive Agency, focusing on building websites and e-commerce sites. Sławomir holds a degree as a technician in computer technology from Zespół Szkół Elektronicznych im. Wojska Polskiego w Bydgoszczy, obtained in 2016.