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Sylwester Kardziejonek has extensive work experience as a Senior Software Engineer and Full Stack Developer. Sylwester has worked for various companies, including Hypatos and Just Join IT in 2022, where they held senior roles in software engineering and full stack development. Sylwester also worked as a Web Development Technical Lead at xYards, Inc. from 2019 to 2022, leading programming efforts and acting as a bridge between business and development. In 2019, they were a Senior Full Stack Developer at Idego Group, responsible for data ingestion and analytics pipelines for an Ad Tech company. Prior to that, they worked as a Senior Software Engineer/Tech Lead at apptimia from 2016 to 2018, where they developed a GIS web application for the UAV sector and designed the software architecture. Sylwester has also held positions at Spreenauten GmbH as the Head of Web Development and Software Engineer, and at Cyren as an R&D Consultant. Additionally, they have worked as a Freelancer, taking on various projects involving website development, e-commerce solutions, and API integration. Sylwester'stechnical skills include React/Next.js, Node.js, Python, Django, Vue.js, PostgreSQL, and more.

Sylwester Kardziejonek completed their high school education at the Szczecińskie Collegium Informatyczne Technikum Informatyczne SCI from 2008 to 2012. Sylwester studied Information Technology during this time. Additionally, they obtained the certification of Professional Scrum Master I from Scrum.org in September 2016.