Ivan Chelishchev is a PHP Backend Tech Leader at Bitrix24, Inc, where they have contributed to the growth of the cloud service from several thousand to 7 million users since 2012. With a strong background in maintaining and developing core PHP frameworks, Ivan has also enhanced the development process and mentored new programmers. They volunteered with Sar-El in 2021, helping to organize warehouse operations, and previously worked as a PHP Backend Developer at INOK, optimizing internal workflows. Ivan holds a Master's degree in Applied Mathematics and Informatics from the Russian State University named after Immanuel Kant, which they completed in 2012.
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