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Maciej Kosiarski has a diverse work experience in the field of software development. Maciej is currently employed at Volt.io as a PHP Software Engineer since May 2022. Prior to this, they worked at Performance Media as a PHP Developer from August 2018 to May 2022. Before that, they were a Junior PHP Developer at Moleo Sp. z o.o. from September 2017 to July 2018. Maciej also gained experience as a Junior Web Developer at Instytut Badan Pollster from July 2016 to August 2017, where they were responsible for implementing new functionalities for internal company applications and working on survey systems. Maciej started their career at Prokantor as an intern from March 2016 to June 2016.

Maciej Kosiarski attended Uniwersytet Marii Curie-Skłodowskiej w Lublinie from 2009 to 2014, where they obtained a Magister (Mgr) degree in History. Maciej also has additional certifications in various fields. In August 2018, they completed the "M001: MongoDB Basics" certification course offered by MongoDB. In May 2019, they completed the "M220P: MongoDB for Python Developers" certification course, also offered by MongoDB. In August 2019, they obtained the "Learn Python by Building a Blockchain & Cryptocurrency" certification from Udemy. Most recently, in November 2021, they completed the "Getting Started With Golang" certification offered by Academind.